Tropical Storm Warning issued October 18 at 9:38AM ChST by NWS Tiyan GU

7 recorded details changed

Title

Before

Tropical Storm Warning issued October 17 at 3:06PM ChST by NWS Tiyan GU

After

Tropical Storm Warning issued October 17 at 9:19PM ChST by NWS Tiyan GU

Source updated

Before

17 October 2026 at 05:06 UTC

After

17 October 2026 at 11:19 UTC

Effective from

Before

17 October 2026 at 05:06 UTC

After

17 October 2026 at 11:19 UTC

Forecast onset

Before

17 October 2026 at 05:06 UTC

After

17 October 2026 at 11:19 UTC

Message expiry

Before

17 October 2026 at 13:15 UTC

After

17 October 2026 at 19:30 UTC

Official description

Before

...CHAMPI UPGRADED TO TYPHOON AND BARRELING TOWARD THE MARIANAS... .NEW INFORMATION... None. .AREAS AFFECTED... This local statement provides information and recommended action for people on Guam, and people on Rota, Tinian and Saipan in the Commonwealth of the Northern Marianas. .Watches/Warnings... A Typhoon Warning continues for Guam and Rota. A Tropical Storm Warning and a Typhoon Watch continue for Tinian and Saipan. A Flood Watch is in effect for all of Guam and the Northern Marianas. Please listen closely for any Flood Warnings that might be in effect for your area. Please check the latest public and marine forecasts for detailed information about additional hazards. .STORM INFORMATION... At 100 PM ChST, the center of Typhoon Champi (29W) was located near latitude 12.5N and longitude 148.0E. This was about 225 miles east- southeast of Guam. Storm motion was west-northwest, 290 degrees, at 18 mph. Storm intensity has increased to 100 mph, making it a Category 2 typhoon. This general forecast track will take Champi just south of Guam as a Category 3 typhoon as it intensifies further the next few days. .SITUATION OVERVIEW... Showers and winds will continue to steadily increase the rest of today, to then deteriorate significantly tonight as newly upgraded Typhoon Champi continues to move in from the east-southeast. Champi is undergoing a period of rapid intensification, strengthening further as the day goes on. The most recent storm tracks continue to indicate Champi passing either south, or over, Guam Sunday morning, which may potentially bring devastating wind conditions to much of Guam during passage. Winds and rain will come in rapidly, with winds becoming dangerous and life threatening very soon after onset. Do not let a false sense of normalcy now dictate your actions tomorrow; prepare NOW!

After

...TYPHOON CHAMPI NOW A DANGEROUS CATEGORY 4 MOVING WEST TOWARDS GUAM COASTAL WATERS... .NEW INFORMATION... Guam is now in Condition of Readiness 1 as of 1 PM ChST. Rota is now in Typhoon Condition of Readiness 1 as of 5 PM ChST. Saipan and Tinian remain in Typhoon Condition of Readiness 3. .AREAS AFFECTED... This local statement provides information and recommended actions for people on Guam and on Rota, Tinian and Saipan in the Northern Marianas. .Watches/Warnings... A Typhoon Warning continues for Guam and Rota. A Tropical Storm Warning and a Typhoon Watch continues for Tinian and Saipan. A Flood Watch is in effect for Rota, Tinian and Saipan in the Northern Marianas. Please listen closely for any Flood Warnings that might be in effect for your area. A Flash Flood Warning is now in effect for Guam. Please check the latest public and marine forecasts for detailed information about additional hazards. .STORM INFORMATION... At 7 PM ChST...the center of Typhoon Champi (29W) was located near latitude 12.6N...longitude 146.7E. This was about 140 miles east-southeast of Guam. Storm motion was west, 280 degrees, at 15 mph. Storm intensity was 130 mph. This general forecast track will take Champi just south of Guam as a Category 4 typhoon as it intensifies further the next few days. .SITUATION OVERVIEW... Typhoon Champi (29W) has been undergoing rapid intensification today. As a result it is now a dangerous category 4 typhoon. It is expected to pass a little south of Guam as a super typhoon within the next 12 hours. This may potentially bring devastating wind conditions to much of Guam during passage. .PRECAUTIONARY/PREPAREDNESS ACTIONS...

External source link

Before

https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.f3ac425658ce0c4107e5c8d6fda782a704256e61.003.1

After

https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.9a5870c872448e6423b4191a0b6d1863ee7a2d3a.003.1

Bulletin issued: 17 October 2026 at 11:19 UTC

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  "id": "nws:1c05998cd34b10233f3456bf",
  "authorityId": "urn:oid:2.49.0.1.840.0.9a5870c872448e6423b4191a0b6d1863ee7a2d3a.003.1",
  "sender": "w-nws.webmaster@noaa.gov",
  "references": [
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      "identifier": "urn:oid:2.49.0.1.840.0.f3ac425658ce0c4107e5c8d6fda782a704256e61.003.1",
      "sender": "w-nws.webmaster@noaa.gov"
    }
  ],
  "category": "weather",
  "title": "Tropical Storm Warning issued October 17 at 9:19PM ChST by NWS Tiyan GU",
  "eventType": "Tropical Storm Warning",
  "occurredAt": "2026-10-17T11:19:00.000Z",
  "issuedAt": "2026-10-17T11:19:00.000Z",
  "timeBasis": "Bulletin issued",
  "effectiveAt": "2026-10-17T11:19:00.000Z",
  "onsetAt": "2026-10-17T11:19:00.000Z",
  "expiresAt": "2026-10-17T19:30:00.000Z",
  "forecastEndAt": null,
  "severity": "Severe",
  "urgency": "Immediate",
  "certainty": "Likely",
  "messageType": "Update",
  "status": "Source update",
  "place": "Tinian; Saipan",
  "coordinates": null,
  "issuer": "NWS Tiyan GU",
  "summary": "Tropical Storm Warning · Tinian; Saipan. Severe; likely; urgency: immediate.",
  "description": "...TYPHOON CHAMPI NOW A DANGEROUS CATEGORY 4 MOVING WEST TOWARDS\nGUAM COASTAL WATERS...\n\n.NEW INFORMATION...\nGuam is now in Condition of Readiness 1 as of 1 PM ChST. Rota is now\nin Typhoon Condition of Readiness 1 as of 5 PM ChST. Saipan and Tinian\nremain in Typhoon Condition of Readiness 3.\n\n.AREAS AFFECTED...\nThis local statement provides information and recommended actions for\npeople on Guam and on Rota, Tinian and Saipan in the Northern\nMarianas.\n\n.Watches/Warnings...\nA Typhoon Warning continues for Guam and Rota.\n\nA Tropical Storm Warning and a Typhoon Watch continues for Tinian\nand Saipan.\n\nA Flood Watch is in effect for Rota, Tinian and Saipan in the\nNorthern Marianas. Please listen closely for any Flood Warnings that\nmight be in effect for your area.\n\nA Flash Flood Warning is now in effect for Guam.\n\nPlease check the latest public and marine forecasts for detailed\ninformation about additional hazards.\n\n.STORM INFORMATION...\nAt 7 PM ChST...the center of Typhoon Champi (29W) was located\nnear latitude 12.6N...longitude 146.7E. This was about 140 miles\neast-southeast of Guam. Storm motion was west, 280 degrees, at 15\nmph. Storm intensity was 130 mph. This general forecast track\nwill take Champi just south of Guam as a Category 4 typhoon as it\nintensifies further the next few days.\n\n.SITUATION OVERVIEW...\nTyphoon Champi (29W) has been undergoing rapid intensification\ntoday. As a result it is now a dangerous category 4 typhoon. It is\nexpected to pass a little south of Guam as a super typhoon within\nthe next 12 hours. This may potentially bring devastating wind\nconditions to much of Guam during passage.\n\n.PRECAUTIONARY/PREPAREDNESS ACTIONS...",
  "instruction": "Take small loose objects indoors. Identify suitable shelter. Stock\nup a few days worth of food and water. If no concrete shelter is\navailable look for a cave or something similar. Take action to\nprotect food crops or other possessions as appropriate.",
  "url": "https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.9a5870c872448e6423b4191a0b6d1863ee7a2d3a.003.1",
  "source": "nws",
  "sourceName": "NOAA NWS"
}

7 recorded details changed

Title

Before

Tropical Storm Warning issued October 17 at 9:13AM ChST by NWS Tiyan GU

After

Tropical Storm Warning issued October 17 at 3:06PM ChST by NWS Tiyan GU

Source updated

Before

16 October 2026 at 23:13 UTC

After

17 October 2026 at 05:06 UTC

Effective from

Before

16 October 2026 at 23:13 UTC

After

17 October 2026 at 05:06 UTC

Forecast onset

Before

16 October 2026 at 23:13 UTC

After

17 October 2026 at 05:06 UTC

Message expiry

Before

17 October 2026 at 08:00 UTC

After

17 October 2026 at 13:15 UTC

Official description

Before

...TYPHOON CHAMPI MOVING WEST-NORTHWEST TOWARDS GUAM... .NEW INFORMATION... Champi upgraded to a typhoon. .AREAS AFFECTED... This local statement provides information and recommended actions for people on Guam, and on Rota, Tinian and Saipan in the Northern Marianas. .WATCHES/WARNINGS... A Typhoon Warning continues for Guam and Rota. A Tropical Storm Warning in conjuction with a Typhoon Watch continue for Tinian and Saipan. A Coastal Flood Warning is in effect for Guam, Rota, Tinian and Saipan. A Flood Watch is in effect for all of Guam and the Northern Marianas. Please listen closely for any Flash Flood Warnings that might be in effect for your area. Please check the latest public and marine forecasts for detailed information about additional hazards. .STORM INFORMATION... At 700 AM ChST, the center of Typhoon Champi (29W) was located near latitude 12.0N and longitude 149.6E. This was about 340 miles east- southeast of Guam. Storm motion was west-northwest, 295 degrees, at 15 mph. Storm intensity was 85 mph. The system is expected to further intensify today, with rapid intensification likely as Champi approaches the Marianas. This general forecast track will take Champi just south of Guam as a category 3 typhoon. .SITUATION OVERVIEW... Showers and winds will steadily increase this afternoon, and then deteriorate significantly from tonight as newly upgraded Typhoon Champi continues to move in from the east-southeast. Champi is expected to go through a period of rapid intensification shortly, strengthening further as the day goes on. Winds and rain will come in rapidly, with winds becoming dangerous and life threatening very soon after onset. Do not let a false sense of normalcy now dictate your actions tomorrow; prepare NOW!

After

...CHAMPI UPGRADED TO TYPHOON AND BARRELING TOWARD THE MARIANAS... .NEW INFORMATION... None. .AREAS AFFECTED... This local statement provides information and recommended action for people on Guam, and people on Rota, Tinian and Saipan in the Commonwealth of the Northern Marianas. .Watches/Warnings... A Typhoon Warning continues for Guam and Rota. A Tropical Storm Warning and a Typhoon Watch continue for Tinian and Saipan. A Flood Watch is in effect for all of Guam and the Northern Marianas. Please listen closely for any Flood Warnings that might be in effect for your area. Please check the latest public and marine forecasts for detailed information about additional hazards. .STORM INFORMATION... At 100 PM ChST, the center of Typhoon Champi (29W) was located near latitude 12.5N and longitude 148.0E. This was about 225 miles east- southeast of Guam. Storm motion was west-northwest, 290 degrees, at 18 mph. Storm intensity has increased to 100 mph, making it a Category 2 typhoon. This general forecast track will take Champi just south of Guam as a Category 3 typhoon as it intensifies further the next few days. .SITUATION OVERVIEW... Showers and winds will continue to steadily increase the rest of today, to then deteriorate significantly tonight as newly upgraded Typhoon Champi continues to move in from the east-southeast. Champi is undergoing a period of rapid intensification, strengthening further as the day goes on. The most recent storm tracks continue to indicate Champi passing either south, or over, Guam Sunday morning, which may potentially bring devastating wind conditions to much of Guam during passage. Winds and rain will come in rapidly, with winds becoming dangerous and life threatening very soon after onset. Do not let a false sense of normalcy now dictate your actions tomorrow; prepare NOW!

External source link

Before

https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.72709b808056f6ef1d8e7631ce1c34eba52dcab0.003.1

After

https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.f3ac425658ce0c4107e5c8d6fda782a704256e61.003.1

Bulletin issued: 17 October 2026 at 05:06 UTC

{
  "id": "nws:c7a5f370c991acfe41d95244",
  "authorityId": "urn:oid:2.49.0.1.840.0.f3ac425658ce0c4107e5c8d6fda782a704256e61.003.1",
  "sender": "w-nws.webmaster@noaa.gov",
  "references": [
    {
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      "sender": "w-nws.webmaster@noaa.gov"
    }
  ],
  "category": "weather",
  "title": "Tropical Storm Warning issued October 17 at 3:06PM ChST by NWS Tiyan GU",
  "eventType": "Tropical Storm Warning",
  "occurredAt": "2026-10-17T05:06:00.000Z",
  "issuedAt": "2026-10-17T05:06:00.000Z",
  "timeBasis": "Bulletin issued",
  "effectiveAt": "2026-10-17T05:06:00.000Z",
  "onsetAt": "2026-10-17T05:06:00.000Z",
  "expiresAt": "2026-10-17T13:15:00.000Z",
  "forecastEndAt": null,
  "severity": "Severe",
  "urgency": "Immediate",
  "certainty": "Likely",
  "messageType": "Update",
  "status": "Source update",
  "place": "Tinian; Saipan",
  "coordinates": null,
  "issuer": "NWS Tiyan GU",
  "summary": "Tropical Storm Warning · Tinian; Saipan. Severe; likely; urgency: immediate.",
  "description": "...CHAMPI UPGRADED TO TYPHOON AND BARRELING TOWARD THE MARIANAS...\n\n.NEW INFORMATION...\nNone.\n\n.AREAS AFFECTED...\nThis local statement provides information and recommended action for\npeople on Guam, and people on Rota, Tinian and Saipan in the\nCommonwealth of the Northern Marianas.\n\n.Watches/Warnings...\nA Typhoon Warning continues for Guam and Rota.\n\nA Tropical Storm Warning and a Typhoon Watch continue for Tinian and\nSaipan.\n\nA Flood Watch is in effect for all of Guam and the Northern\nMarianas. Please listen closely for any Flood Warnings that might\nbe in effect for your area.\n\nPlease check the latest public and marine forecasts for detailed\ninformation about additional hazards.\n\n.STORM INFORMATION...\nAt 100 PM ChST, the center of Typhoon Champi (29W) was located near\nlatitude 12.5N and longitude 148.0E. This was about 225 miles east-\nsoutheast of Guam. Storm motion was west-northwest, 290 degrees,\nat 18 mph. Storm intensity has increased to 100 mph, making it a\nCategory 2 typhoon. This general forecast track will take Champi\njust south of Guam as a Category 3 typhoon as it intensifies\nfurther the next few days.\n\n.SITUATION OVERVIEW...\nShowers and winds will continue to steadily increase the rest of\ntoday, to then deteriorate significantly tonight as newly upgraded\nTyphoon Champi continues to move in from the east-southeast. Champi\nis undergoing a period of rapid intensification, strengthening\nfurther as the day goes on. The most recent storm tracks continue to\nindicate Champi passing either south, or over, Guam Sunday morning,\nwhich may potentially bring devastating wind conditions to much of\nGuam during passage. Winds and rain will come in rapidly, with winds\nbecoming dangerous and life threatening very soon after onset. Do not\nlet a false sense of normalcy now dictate your actions tomorrow;\nprepare NOW!",
  "instruction": "Take small loose objects indoors. Identify suitable shelter. Stock\nup a few days worth of food and water. If no concrete shelter is\navailable look for a cave or something similar. Take action to\nprotect food crops or other possessions as appropriate.",
  "url": "https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.f3ac425658ce0c4107e5c8d6fda782a704256e61.003.1",
  "source": "nws",
  "sourceName": "NOAA NWS"
}

8 recorded details changed

Title

Before

Tropical Storm Warning issued October 17 at 3:03AM ChST by NWS Tiyan GU

After

Tropical Storm Warning issued October 17 at 9:13AM ChST by NWS Tiyan GU

Source updated

Before

16 October 2026 at 17:03 UTC

After

16 October 2026 at 23:13 UTC

Effective from

Before

16 October 2026 at 17:03 UTC

After

16 October 2026 at 23:13 UTC

Forecast onset

Before

16 October 2026 at 17:03 UTC

After

16 October 2026 at 23:13 UTC

Message expiry

Before

17 October 2026 at 01:15 UTC

After

17 October 2026 at 08:00 UTC

Official description

Before

...TROPICAL STORM CHAMPI MOVING WEST TOWARD GUAM... .NEW INFORMATION... None. .AREAS AFFECTED... This local statement provides information and recommended actions for people on Guam and on Rota, Tinian and Saipan in the Northern Marianas. .Watches/Warnings... A Typhoon Warning continues for Guam and Rota. A Tropical storm warning and a Typhoon Watch continues for Tinian and Saipan. A Flood Watch is in effect for all of Guam and the Northern Marianas. Please listen closely for any Flood Warnings that might be in effect for your area. Please check the latest public and marine forecasts for detailed information about additional hazards. .STORM INFORMATION... At 1 AM ChST...the center of Tropical Storm Champi (29W) was located near latitude 11.6N...longitude 150.8E. This was about 420 miles east-southeast of Guam. Storm motion was west, 275 degrees, at 15 mph. Storm intensity was 70 mph. .SITUATION OVERVIEW... TS Champi continues to head toward Guam. Along the way, Rota will be affected by lesser but still damaging winds toward the outside of Champi. Tinian and Saipan will be just grazed by the edge. .PRECAUTIONARY/PREPAREDNESS ACTIONS...

After

...TYPHOON CHAMPI MOVING WEST-NORTHWEST TOWARDS GUAM... .NEW INFORMATION... Champi upgraded to a typhoon. .AREAS AFFECTED... This local statement provides information and recommended actions for people on Guam, and on Rota, Tinian and Saipan in the Northern Marianas. .WATCHES/WARNINGS... A Typhoon Warning continues for Guam and Rota. A Tropical Storm Warning in conjuction with a Typhoon Watch continue for Tinian and Saipan. A Coastal Flood Warning is in effect for Guam, Rota, Tinian and Saipan. A Flood Watch is in effect for all of Guam and the Northern Marianas. Please listen closely for any Flash Flood Warnings that might be in effect for your area. Please check the latest public and marine forecasts for detailed information about additional hazards. .STORM INFORMATION... At 700 AM ChST, the center of Typhoon Champi (29W) was located near latitude 12.0N and longitude 149.6E. This was about 340 miles east- southeast of Guam. Storm motion was west-northwest, 295 degrees, at 15 mph. Storm intensity was 85 mph. The system is expected to further intensify today, with rapid intensification likely as Champi approaches the Marianas. This general forecast track will take Champi just south of Guam as a category 3 typhoon. .SITUATION OVERVIEW... Showers and winds will steadily increase this afternoon, and then deteriorate significantly from tonight as newly upgraded Typhoon Champi continues to move in from the east-southeast. Champi is expected to go through a period of rapid intensification shortly, strengthening further as the day goes on. Winds and rain will come in rapidly, with winds becoming dangerous and life threatening very soon after onset. Do not let a false sense of normalcy now dictate your actions tomorrow; prepare NOW!

Official instructions

Before

Stay calm and keep informed. Comply with any evacuation orders that are issued for your area. If you live in a metal roof or container home, or you live in a surge zone or any location prone to flooding, evacuate to a designated shelter or ride out the storm in the sturdy home of family or friends outside of evacuation zones. Items to bring to a shelter include a first aid kit, medicines and prescriptions, baby food and diapers, games and books, toiletries, a battery powered radio, a cell phone, flashlights with extra batteries, a blanket or sleeping bag for each person, personal identification, copies of key papers such as insurance policies, available cash and credit cards. Remember, pets are not allowed in most public shelters, so check ahead with your intended shelter. Regarding your home or business, cover all windows and doors with shutters or plywood. Move patio furniture and other loose objects indoors. Brace all exterior doors, including garage doors. Do this as early as possible. If you need to make a trip to the hardware store, the grocery store, or the gas station, do so as early as possible.

After

Take small loose objects indoors. Identify suitable shelter. Stock up a few days worth of food and water. If no concrete shelter is available look for a cave or something similar. Take action to protect food crops or other possessions as appropriate.

External source link

Before

https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.0ee6a7519bf9283a0c3ce63c2b1c084561cadc09.003.1

After

https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.72709b808056f6ef1d8e7631ce1c34eba52dcab0.003.1

Bulletin issued: 16 October 2026 at 23:13 UTC

{
  "id": "nws:cdc4d115a163fae937b9a2bd",
  "authorityId": "urn:oid:2.49.0.1.840.0.72709b808056f6ef1d8e7631ce1c34eba52dcab0.003.1",
  "sender": "w-nws.webmaster@noaa.gov",
  "references": [
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      "identifier": "urn:oid:2.49.0.1.840.0.0ee6a7519bf9283a0c3ce63c2b1c084561cadc09.003.1",
      "sender": "w-nws.webmaster@noaa.gov"
    }
  ],
  "category": "weather",
  "title": "Tropical Storm Warning issued October 17 at 9:13AM ChST by NWS Tiyan GU",
  "eventType": "Tropical Storm Warning",
  "occurredAt": "2026-10-16T23:13:00.000Z",
  "issuedAt": "2026-10-16T23:13:00.000Z",
  "timeBasis": "Bulletin issued",
  "effectiveAt": "2026-10-16T23:13:00.000Z",
  "onsetAt": "2026-10-16T23:13:00.000Z",
  "expiresAt": "2026-10-17T08:00:00.000Z",
  "forecastEndAt": null,
  "severity": "Severe",
  "urgency": "Immediate",
  "certainty": "Likely",
  "messageType": "Update",
  "status": "Source update",
  "place": "Tinian; Saipan",
  "coordinates": null,
  "issuer": "NWS Tiyan GU",
  "summary": "Tropical Storm Warning · Tinian; Saipan. Severe; likely; urgency: immediate.",
  "description": "...TYPHOON CHAMPI MOVING WEST-NORTHWEST TOWARDS GUAM...\n\n.NEW INFORMATION...\nChampi upgraded to a typhoon.\n\n.AREAS AFFECTED...\nThis local statement provides information and recommended actions for\npeople on Guam, and on Rota, Tinian and Saipan in the Northern\nMarianas.\n\n.WATCHES/WARNINGS...\nA Typhoon Warning continues for Guam and Rota.\nA Tropical Storm Warning in conjuction with a Typhoon Watch continue\nfor Tinian and Saipan.\nA Coastal Flood Warning is in effect for Guam, Rota, Tinian and\nSaipan.\n\nA Flood Watch is in effect for all of Guam and the Northern\nMarianas. Please listen closely for any Flash Flood Warnings that\nmight be in effect for your area.\n\nPlease check the latest public and marine forecasts for detailed\ninformation about additional hazards.\n\n.STORM INFORMATION...\nAt 700 AM ChST, the center of Typhoon Champi (29W) was located near\nlatitude 12.0N and longitude 149.6E. This was about 340 miles east-\nsoutheast of Guam. Storm motion was west-northwest, 295 degrees, at\n15 mph. Storm intensity was 85 mph. The system is expected to further\nintensify today, with rapid intensification likely as Champi\napproaches the Marianas. This general forecast track will take\nChampi just south of Guam as a category 3 typhoon.\n\n.SITUATION OVERVIEW...\nShowers and winds will steadily increase this afternoon, and then\ndeteriorate significantly from tonight as newly upgraded Typhoon\nChampi continues to move in from the east-southeast. Champi is\nexpected to go through a period of rapid intensification shortly,\nstrengthening further as the day goes on. Winds and rain will come\nin rapidly, with winds becoming dangerous and life threatening very\nsoon after onset. Do not let a false sense of normalcy now dictate\nyour actions tomorrow; prepare NOW!",
  "instruction": "Take small loose objects indoors. Identify suitable shelter. Stock\nup a few days worth of food and water. If no concrete shelter is\navailable look for a cave or something similar. Take action to\nprotect food crops or other possessions as appropriate.",
  "url": "https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.72709b808056f6ef1d8e7631ce1c34eba52dcab0.003.1",
  "source": "nws",
  "sourceName": "NOAA NWS"
}

8 recorded details changed

Title

Before

Tropical Storm Warning issued October 16 at 9:43PM ChST by NWS Tiyan GU

After

Tropical Storm Warning issued October 17 at 3:03AM ChST by NWS Tiyan GU

Source updated

Before

16 October 2026 at 11:43 UTC

After

16 October 2026 at 17:03 UTC

Effective from

Before

16 October 2026 at 11:43 UTC

After

16 October 2026 at 17:03 UTC

Forecast onset

Before

16 October 2026 at 11:43 UTC

After

16 October 2026 at 17:03 UTC

Message expiry

Before

16 October 2026 at 19:45 UTC

After

17 October 2026 at 01:15 UTC

Official description

Before

...TROPICAL STORM CHAMPI INTENSIFYING AND MOVING WEST TOWARDS THE MARIANAS... ...CHAMPI LIKELY TO MOVE NEAR GUAM AS A TYPHOON... .NEW INFORMATION... Guam was placed in Condition of Readiness 2 as of 1 PM ChST. .AREAS AFFECTED... This local statement provides information and recommended actions for people on Guam and on Rota, Tinian and Saipan in the Northern Marianas. .Watches/Warnings... A Typhoon Warning continues for Guam and Rota. A Tropical storm warning and a Typhoon Watch continue for Tinian and Saipan. A Flood Watch is in effect for all of Guam and the Northern Marianas. Please listen closely for any Flood Warnings that might be in effect for your area. Please check the latest public and marine forecasts for detailed information about additional hazards. .STORM INFORMATION... At 8 PM ChST...the center of Tropical Storm Champi (29W) was located near latitude 11.6N...longitude 152.1E. This was about 510 miles east-southeast of Guam. Storm motion was west, 275 degrees, at 13 mph. Storm intensity was 60 mph. .SITUATION OVERVIEW... TS Champi continues to head toward Guam. Along the way, Rota will be affected by lesser bu…

After

...TROPICAL STORM CHAMPI MOVING WEST TOWARD GUAM... .NEW INFORMATION... None. .AREAS AFFECTED... This local statement provides information and recommended actions for people on Guam and on Rota, Tinian and Saipan in the Northern Marianas. .Watches/Warnings... A Typhoon Warning continues for Guam and Rota. A Tropical storm warning and a Typhoon Watch continues for Tinian and Saipan. A Flood Watch is in effect for all of Guam and the Northern Marianas. Please listen closely for any Flood Warnings that might be in effect for your area. Please check the latest public and marine forecasts for detailed information about additional hazards. .STORM INFORMATION... At 1 AM ChST...the center of Tropical Storm Champi (29W) was located near latitude 11.6N...longitude 150.8E. This was about 420 miles east-southeast of Guam. Storm motion was west, 275 degrees, at 15 mph. Storm intensity was 70 mph. .SITUATION OVERVIEW... TS Champi continues to head toward Guam. Along the way, Rota will be affected by lesser bu…

Official instructions

Before

Keep informed and listen for possible changes to the forecast. Comply with any evacuation orders issued for your area. If you live in a metal roof or container home, make plans to evacuate. Gather clothes, important papers, medicines, and small valuables and keep them ready to go on short notice. Gas up your vehicles and have extra cash on hand. Regarding your home or business, cover all windows and doors with shutters or plywood. Move patio furniture and other loose objects indoors. Brace all exterior doors, including garage doors.

After

Stay calm and keep informed. Comply with any evacuation orders that are issued for your area. If you live in a metal roof or container home, or you live in a surge zone or any location prone to flooding, evacuate to a designated shelter or ride out the storm in the sturdy home of family or friends outside of evacuation zones. Items to bring to a shelter include a first aid kit, medicines and prescriptions, baby food and diapers, games and books, toiletries, a battery powered radio, a cell phone, flashlights with extra batteries, a blanket or sleeping bag for each person, personal identification, copies of key papers such as insurance policies, available cash and credit cards. Remember, pets are not allowed in most public shelters, so check ahead with your intended shelter. Regarding your home or business, cover all windows and doors with shutters or plywood. Move patio furniture and other loose objects indoors. Brace all exterior doors, including garage doors. Do this as early as possible. If you need to make a trip to the hardware store, the grocery store, or the gas station, do so as early as possible.

External source link

Before

https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.f1dfdbd64986b09a5958ed031fd82e95a9442522.003.1

After

https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.0ee6a7519bf9283a0c3ce63c2b1c084561cadc09.003.1

Bulletin issued: 16 October 2026 at 17:03 UTC

{
  "id": "nws:932f6671695e09c75282094c",
  "authorityId": "urn:oid:2.49.0.1.840.0.0ee6a7519bf9283a0c3ce63c2b1c084561cadc09.003.1",
  "sender": "w-nws.webmaster@noaa.gov",
  "references": [
    {
      "identifier": "urn:oid:2.49.0.1.840.0.f1dfdbd64986b09a5958ed031fd82e95a9442522.003.1",
      "sender": "w-nws.webmaster@noaa.gov"
    }
  ],
  "category": "weather",
  "title": "Tropical Storm Warning issued October 17 at 3:03AM ChST by NWS Tiyan GU",
  "eventType": "Tropical Storm Warning",
  "occurredAt": "2026-10-16T17:03:00.000Z",
  "issuedAt": "2026-10-16T17:03:00.000Z",
  "timeBasis": "Bulletin issued",
  "effectiveAt": "2026-10-16T17:03:00.000Z",
  "onsetAt": "2026-10-16T17:03:00.000Z",
  "expiresAt": "2026-10-17T01:15:00.000Z",
  "forecastEndAt": null,
  "severity": "Severe",
  "urgency": "Immediate",
  "certainty": "Likely",
  "messageType": "Update",
  "status": "Source update",
  "place": "Tinian; Saipan",
  "coordinates": null,
  "issuer": "NWS Tiyan GU",
  "summary": "Tropical Storm Warning · Tinian; Saipan. Severe; likely; urgency: immediate.",
  "description": "...TROPICAL STORM CHAMPI MOVING WEST TOWARD GUAM...\n\n.NEW INFORMATION...\nNone.\n\n.AREAS AFFECTED...\nThis local statement provides information and recommended actions for\npeople on Guam and on Rota, Tinian and Saipan in the Northern\nMarianas.\n\n.Watches/Warnings...\nA Typhoon Warning continues for Guam and Rota.\n\nA Tropical storm warning and a Typhoon Watch continues for Tinian\nand Saipan.\n\nA Flood Watch is in effect for all of Guam and the Northern\nMarianas. Please listen closely for any Flood Warnings that might\nbe in effect for your area.\n\nPlease check the latest public and marine forecasts for detailed\ninformation about additional hazards.\n\n.STORM INFORMATION...\nAt 1 AM ChST...the center of Tropical Storm Champi (29W) was located\nnear latitude 11.6N...longitude 150.8E. This was about 420 miles\neast-southeast of Guam. Storm motion was west, 275 degrees, at 15 mph.\nStorm intensity was 70 mph.\n\n.SITUATION OVERVIEW...\nTS Champi continues to head toward Guam. Along the way, Rota will be\naffected by lesser but still damaging winds toward the outside of\nChampi. Tinian and Saipan will be just grazed by the edge.\n\n.PRECAUTIONARY/PREPAREDNESS ACTIONS...",
  "instruction": "Stay calm and keep informed. Comply with any evacuation orders\nthat are issued for your area. If you live in a metal roof or\ncontainer home, or you live in a surge zone or any location prone\nto flooding, evacuate to a designated shelter or ride out the\nstorm in the sturdy home of family or friends outside of\nevacuation zones.\n\nItems to bring to a shelter include a first aid kit, medicines\nand prescriptions, baby food and diapers, games and books,\ntoiletries, a battery powered radio, a cell phone, flashlights\nwith extra batteries, a blanket or sleeping bag for each person,\npersonal identification, copies of key papers such as insurance\npolicies, available cash and credit cards. Remember, pets are not\nallowed in most public shelters, so check ahead with your\nintended shelter.\n\nRegarding your home or business, cover all windows and doors with\nshutters or plywood. Move patio furniture and other loose objects\nindoors. Brace all exterior doors, including garage doors. Do\nthis as early as possible.\n\nIf you need to make a trip to the hardware store, the grocery\nstore, or the gas station, do so as early as possible.",
  "url": "https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.0ee6a7519bf9283a0c3ce63c2b1c084561cadc09.003.1",
  "source": "nws",
  "sourceName": "NOAA NWS"
}

Source status changed

Title

Before

Tropical Storm Warning issued October 16 at 4:11PM ChST by NWS Tiyan GU

After

Tropical Storm Warning issued October 16 at 9:43PM ChST by NWS Tiyan GU

Source updated

Before

16 October 2026 at 06:11 UTC

After

16 October 2026 at 11:43 UTC

Effective from

Before

16 October 2026 at 06:11 UTC

After

16 October 2026 at 11:43 UTC

Forecast onset

Before

16 October 2026 at 06:11 UTC

After

16 October 2026 at 11:43 UTC

Message expiry

Before

16 October 2026 at 14:15 UTC

After

16 October 2026 at 19:45 UTC

Message type

Before

Alert

After

Update

Source status

Before

Source alert

After

Source update

Official description

Before

...TROPICAL STORM CHAMPI MOVING RAPIDLY WEST ON APPROACH TO THE MARIANAS... ...CHAMPI LIKELY TO MOVE NEAR GUAM AND ROTA AS A TYPHOON... .NEW INFORMATION... A Typhoon Warning has been issued for Guam, Rota, and the adjacent waters. A Tropical Storm Warning has been issued for Tinian, Saipan, and the adjacent waters. .AREAS AFFECTED... This local statement provides information and recommended action for people on Guam, and people on Rota, Tinian and Saipan in the Commonwealth of the Northern Marianas. .WATCHES/WARNINGS... A Typhoon Warning is in effect for Guam and Rota. A Tropical Storm Warning is in effect for Tinian and Saipan. A Typhoon Watch continues for Tinian and Saipan. A Flood Watch is in effect for all of Guam and the Northern Marianas. Please listen closely for any Flood Warnings that might be in effect for your area. Please check the latest public and marine forecasts for detailed information about additional hazards. .STORM INFORMATION... At 200 PM ChST, the center of Tropical Storm Champi (29W) was located near latitude 11.4N and longitude 153.3E, about 300 miles north- northeast of Chuuk and about 590 miles east-southeast of Guam. Storm motion was west, 265 degrees, at 24 mph. Storm intensity was 50 mph. Champi will continue on this trajectory and slow down as it continues barreling toward the Marianas. This general forecast track will take Champi close to, or over, Guam Sunday morning. Champi is forecast to continue intensifying over the next few days, likely becoming a typhoon by Saturday. .SITUATION OVERVIEW... Mostly benign conditions are expected across the Marianas tonight, followed by a steady increase in showers and winds Friday afternoon, and then deteriorating significantly coming into Saturday night as Tropical Storm Champi continues to move in from the east-southeast. Champi is expected to go through a period of rapid intensification over the next 24 hours, becoming a typhoon by Saturday and strengthening further thereafter. Winds and rain will come in rapidly, with winds becoming dangerous and life threatening very soon after onset. Do not let a false sense of normalcy now dictate your actions tomorrow; prepare NOW!

After

...TROPICAL STORM CHAMPI INTENSIFYING AND MOVING WEST TOWARDS THE MARIANAS... ...CHAMPI LIKELY TO MOVE NEAR GUAM AS A TYPHOON... .NEW INFORMATION... Guam was placed in Condition of Readiness 2 as of 1 PM ChST. .AREAS AFFECTED... This local statement provides information and recommended actions for people on Guam and on Rota, Tinian and Saipan in the Northern Marianas. .Watches/Warnings... A Typhoon Warning continues for Guam and Rota. A Tropical storm warning and a Typhoon Watch continue for Tinian and Saipan. A Flood Watch is in effect for all of Guam and the Northern Marianas. Please listen closely for any Flood Warnings that might be in effect for your area. Please check the latest public and marine forecasts for detailed information about additional hazards. .STORM INFORMATION... At 8 PM ChST...the center of Tropical Storm Champi (29W) was located near latitude 11.6N...longitude 152.1E. This was about 510 miles east-southeast of Guam. Storm motion was west, 275 degrees, at 13 mph. Storm intensity was 60 mph. .SITUATION OVERVIEW... TS Champi continues to head toward Guam. Along the way, Rota will be affected by lesser but still damaging winds toward the outside of Champi. Tinian and Saipan will be just grazed by the edge. .PRECAUTIONARY/PREPAREDNESS ACTIONS...

Official instructions

Before

Take small loose objects indoors. Identify suitable shelter. Stock up a few days worth of food and water. If no concrete shelter is available look for a cave or something similar. Take action to protect food crops or other possessions as appropriate.

After

Keep informed and listen for possible changes to the forecast. Comply with any evacuation orders issued for your area. If you live in a metal roof or container home, make plans to evacuate. Gather clothes, important papers, medicines, and small valuables and keep them ready to go on short notice. Gas up your vehicles and have extra cash on hand. Regarding your home or business, cover all windows and doors with shutters or plywood. Move patio furniture and other loose objects indoors. Brace all exterior doors, including garage doors.

External source link

Before

https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.8b3ecad2910ecff02ba0338c6ab40c35cd21e03e.003.1

After

https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.f1dfdbd64986b09a5958ed031fd82e95a9442522.003.1

Bulletin issued: 16 October 2026 at 11:43 UTC

{
  "id": "nws:06d0db44bc418ac5625011e2",
  "authorityId": "urn:oid:2.49.0.1.840.0.f1dfdbd64986b09a5958ed031fd82e95a9442522.003.1",
  "sender": "w-nws.webmaster@noaa.gov",
  "references": [
    {
      "identifier": "urn:oid:2.49.0.1.840.0.8b3ecad2910ecff02ba0338c6ab40c35cd21e03e.003.1",
      "sender": "w-nws.webmaster@noaa.gov"
    }
  ],
  "category": "weather",
  "title": "Tropical Storm Warning issued October 16 at 9:43PM ChST by NWS Tiyan GU",
  "eventType": "Tropical Storm Warning",
  "occurredAt": "2026-10-16T11:43:00.000Z",
  "issuedAt": "2026-10-16T11:43:00.000Z",
  "timeBasis": "Bulletin issued",
  "effectiveAt": "2026-10-16T11:43:00.000Z",
  "onsetAt": "2026-10-16T11:43:00.000Z",
  "expiresAt": "2026-10-16T19:45:00.000Z",
  "forecastEndAt": null,
  "severity": "Severe",
  "urgency": "Immediate",
  "certainty": "Likely",
  "messageType": "Update",
  "status": "Source update",
  "place": "Tinian; Saipan",
  "coordinates": null,
  "issuer": "NWS Tiyan GU",
  "summary": "Tropical Storm Warning · Tinian; Saipan. Severe; likely; urgency: immediate.",
  "description": "...TROPICAL STORM CHAMPI INTENSIFYING AND MOVING WEST TOWARDS THE\nMARIANAS...\n...CHAMPI LIKELY TO MOVE NEAR GUAM AS A TYPHOON...\n\n.NEW INFORMATION...\nGuam was placed in Condition of Readiness 2 as of 1 PM ChST.\n\n.AREAS AFFECTED...\nThis local statement provides information and recommended actions for\npeople on Guam and on Rota, Tinian and Saipan in the Northern\nMarianas.\n\n.Watches/Warnings...\nA Typhoon Warning continues for Guam and Rota.\n\nA Tropical storm warning and a Typhoon Watch continue for Tinian\nand Saipan.\n\nA Flood Watch is in effect for all of Guam and the Northern\nMarianas. Please listen closely for any Flood Warnings that might\nbe in effect for your area.\n\nPlease check the latest public and marine forecasts for detailed\ninformation about additional hazards.\n\n.STORM INFORMATION...\nAt 8 PM ChST...the center of Tropical Storm Champi (29W) was located\nnear latitude 11.6N...longitude 152.1E. This was about 510 miles\neast-southeast of Guam. Storm motion was west, 275 degrees, at 13 mph.\nStorm intensity was 60 mph.\n\n.SITUATION OVERVIEW...\nTS Champi continues to head toward Guam. Along the way, Rota will be\naffected by lesser but still damaging winds toward the outside of\nChampi. Tinian and Saipan will be just grazed by the edge.\n\n.PRECAUTIONARY/PREPAREDNESS ACTIONS...",
  "instruction": "Keep informed and listen for possible changes to the forecast.\nComply with any evacuation orders issued for your area. If you\nlive in a metal roof or container home, make plans to evacuate.\n\nGather clothes, important papers, medicines, and small valuables\nand keep them ready to go on short notice. Gas up your vehicles\nand have extra cash on hand.\n\nRegarding your home or business, cover all windows and doors with\nshutters or plywood. Move patio furniture and other loose objects\nindoors. Brace all exterior doors, including garage doors.",
  "url": "https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.f1dfdbd64986b09a5958ed031fd82e95a9442522.003.1",
  "source": "nws",
  "sourceName": "NOAA NWS"
}

First saved record

Our first saved version of Tropical Storm Warning issued October 16 at 4:11PM ChST by NWS Tiyan GU. We have no earlier saved version to compare.

Bulletin issued: 16 October 2026 at 06:11 UTC

{
  "id": "nws:552090cea631e1520d0c6133",
  "authorityId": "urn:oid:2.49.0.1.840.0.8b3ecad2910ecff02ba0338c6ab40c35cd21e03e.003.1",
  "sender": "w-nws.webmaster@noaa.gov",
  "references": [],
  "category": "weather",
  "title": "Tropical Storm Warning issued October 16 at 4:11PM ChST by NWS Tiyan GU",
  "eventType": "Tropical Storm Warning",
  "occurredAt": "2026-10-16T06:11:00.000Z",
  "issuedAt": "2026-10-16T06:11:00.000Z",
  "timeBasis": "Bulletin issued",
  "effectiveAt": "2026-10-16T06:11:00.000Z",
  "onsetAt": "2026-10-16T06:11:00.000Z",
  "expiresAt": "2026-10-16T14:15:00.000Z",
  "forecastEndAt": null,
  "severity": "Severe",
  "urgency": "Immediate",
  "certainty": "Likely",
  "messageType": "Alert",
  "status": "Source alert",
  "place": "Tinian; Saipan",
  "coordinates": null,
  "issuer": "NWS Tiyan GU",
  "summary": "Tropical Storm Warning · Tinian; Saipan. Severe; likely; urgency: immediate.",
  "description": "...TROPICAL STORM CHAMPI MOVING RAPIDLY WEST ON APPROACH TO THE\nMARIANAS...\n...CHAMPI LIKELY TO MOVE NEAR GUAM AND ROTA AS A TYPHOON...\n\n.NEW INFORMATION...\nA Typhoon Warning has been issued for Guam, Rota, and the adjacent\nwaters.\nA Tropical Storm Warning has been issued for Tinian, Saipan, and the\nadjacent waters.\n\n.AREAS AFFECTED...\nThis local statement provides information and recommended action for\npeople on Guam, and people on Rota, Tinian and Saipan in the\nCommonwealth of the Northern Marianas.\n\n.WATCHES/WARNINGS...\nA Typhoon Warning is in effect for Guam and Rota.\nA Tropical Storm Warning is in effect for Tinian and Saipan.\nA Typhoon Watch continues for Tinian and Saipan.\n\nA Flood Watch is in effect for all of Guam and the Northern Marianas.\nPlease listen closely for any Flood Warnings that might be in effect\nfor your area.\n\nPlease check the latest public and marine forecasts for detailed\ninformation about additional hazards.\n\n.STORM INFORMATION...\nAt 200 PM ChST, the center of Tropical Storm Champi (29W) was located\nnear latitude 11.4N and longitude 153.3E, about 300 miles north-\nnortheast of Chuuk and about 590 miles east-southeast of Guam. Storm\nmotion was west, 265 degrees, at 24 mph. Storm intensity was 50 mph.\nChampi will continue on this trajectory and slow down as it continues\nbarreling toward the Marianas. This general forecast track will take\nChampi close to, or over, Guam Sunday morning. Champi is forecast to\ncontinue intensifying over the next few days, likely becoming a\ntyphoon by Saturday.\n\n.SITUATION OVERVIEW...\nMostly benign conditions are expected across the Marianas tonight,\nfollowed by a steady increase in showers and winds Friday afternoon,\nand then deteriorating significantly coming into Saturday night as\nTropical Storm Champi continues to move in from the east-southeast.\nChampi is expected to go through a period of rapid intensification\nover the next 24 hours, becoming a typhoon by Saturday and\nstrengthening further thereafter. Winds and rain will come in\nrapidly, with winds becoming dangerous and life threatening very soon\nafter onset. Do not let a false sense of normalcy now dictate your\nactions tomorrow; prepare NOW!",
  "instruction": "Take small loose objects indoors. Identify suitable shelter. Stock\nup a few days worth of food and water. If no concrete shelter is\navailable look for a cave or something similar. Take action to\nprotect food crops or other possessions as appropriate.",
  "url": "https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.8b3ecad2910ecff02ba0338c6ab40c35cd21e03e.003.1",
  "source": "nws",
  "sourceName": "NOAA NWS"
}