NOAA NWS / Event history

Typhoon Watch issued October 16 at 4:51PM ChST by NWS Tiyan GU

Typhoon Watch · Tinian Coastal Waters; Saipan Coastal Waters. Severe; possible; urgency: future.

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Bulletin issued: 16 October 2026 at 06:51 UTC
First saved by us: 15 October 2026 at 14:28 UTC
Last included in a daily record: 16 October 2026
The linked daily edition preserves what we captured that UTC day; this event page is not a live warning.
Source classification: Severe · Source update

A recent feed check does not mean a new observation. This page preserves source records; it does not establish current safety or warning status.

Issuer / area: NWS Tiyan GU · Tinian Coastal Waters; Saipan Coastal Waters
Certainty / urgency: Possible / Future
Message expiry (not hazard end): 16 October 2026 at 21:00 UTC
Forecast onset / end: 16 October 2026 at 06:51 UTC / Not supplied

Archived official description

* WHAT...Tropical storm conditions, including winds of 34 to 63 knots, are expected. Typhoon conditions, including winds of 64 knots or more are possible within the next 48 hours. * WHERE...Tinian and Saipan Coastal Waters. * WHEN...Onset of damaging winds beginning Saturday night, continuing into at least Sunday night, possibly longer if conditions warrant. * IMPACTS...Destructive winds will produce dangerous seas that could damage, capsize or sink vessels, along with drastically reducing visibilities in heavy rain. * ADDITIONAL DETAILS...Tropical Storm Champi (29W) continues to move quickly toward the Marianas. The exact path of 29W remains subject to change. However, guidance supports a passage through Guam coastal waters, with damaging winds moving into Tinian and Saipan Saturday night and lasting into at least Sunday night. Champi is expected to strengthen further today and Saturday as it approaches, then move through the region as a typhoon Sunday morning. Seas will quickly rise, with significant sea heights reaching as high as 25 feet during closest passage of Champi. Dangerous sea conditions may continue into Monday.

Instructions in this archived message

Prepare for tropical storm force conditions Sunday morning. Secure all vessels. Conditions are expected to be catastrophic for small craft, and extremely dangerous for any vessels of larger size. As Tropical Storm Champi approaches the Marianas, stay in safe harbor.

The saved record

What changed

2 updates · 1 first record

Each update compares two versions we saved. This may not include every update from the source. A missing report does not mean an event has ended.

Showing 2 changes

Saved by us
16 October 2026 at 07:02 UTC
Version 3
10 recorded details changed
Title
Before
Typhoon Watch issued October 16 at 8:56AM ChST by NWS Tiyan GU
After
Typhoon Watch issued October 16 at 4:51PM ChST by NWS Tiyan GU
Source updated
Before
15 October 2026 at 22:56 UTC
After
16 October 2026 at 06:51 UTC
Effective from
Before
15 October 2026 at 22:56 UTC
After
16 October 2026 at 06:51 UTC
Forecast onset
Before
15 October 2026 at 22:56 UTC
After
16 October 2026 at 06:51 UTC
Message expiry
Before
16 October 2026 at 08:00 UTC
After
16 October 2026 at 21:00 UTC
Reported area
Before
Guam Coastal Waters; Rota Coastal Waters; Tinian Coastal Waters; Saipan Coastal Waters
After
Tinian Coastal Waters; Saipan Coastal Waters
Source summary
Before
Typhoon Watch · ~~Guam Coastal Waters; Rota Coastal Waters;~~ Tinian Coastal Waters; Saipan Coastal Waters. Severe; possible; urgency: future.
After
Typhoon Watch · Tinian Coastal Waters; Saipan Coastal Waters. Severe; possible; urgency: future.
Official description
Before
* WHAT...Typhoon conditions, including winds of 64 knots or more are possible within the next 48 hours. * WHERE...Guam, Rota, Tinian and Saipan Coastal Waters. * WHEN...Through at least Sunday night, possibly longer if conditions warrant. * IMPACTS...Destructive winds will produce dangerous seas that could damage, capsize or sink vessels, along with drastically reducing visibilities in heavy rain. * ADDITIONAL DETAILS...Tropical Storm Champi (29W) is still inching closer to the Marianas. The exact path of 29W remains subject to change. However, it is expected to pass through the coastal waters over the weekend. Champi is expected to strengthen further today as it approaches, expected to move through the region as at least a category 1 typhoon, with higher likelihood of being stronger.
After
* WHAT...Tropical storm conditions, including winds of 34 to 63 knots, are expected. Typhoon conditions, including winds of 64 knots or more are possible within the next 48 hours. * WHERE...Tinian and Saipan Coastal Waters. * WHEN...Onset of damaging winds beginning Saturday night, continuing into at least Sunday night, possibly longer if conditions warrant. * IMPACTS...Destructive winds will produce dangerous seas that could damage, capsize or sink vessels, along with drastically reducing visibilities in heavy rain. * ADDITIONAL DETAILS...Tropical Storm Champi (29W) continues to move quickly toward the Marianas. The exact path of 29W remains subject to change. However, guidance supports a passage through Guam coastal waters, with damaging winds moving into Tinian and Saipan Saturday night and lasting into at least Sunday night. Champi is expected to strengthen further today and Saturday as it approaches, then move through the region as a typhoon Sunday morning. Seas will quickly rise, with significant sea heights reaching as high as 25 feet during closest passage of Champi. Dangerous sea conditions may continue into Monday.
Official instructions
Before
~~Mariners should pay close attention to the marine forecast and consider wind and sea conditions in planning. Remain in port, seek safe harbor and/or secure your vessel for severe wind and seas.~~
After
Prepare for tropical storm force conditions Sunday morning. Secure all vessels. Conditions are expected to be catastrophic for small craft, and extremely dangerous for any vessels of larger size. As Tropical Storm Champi approaches the Marianas, stay in safe harbor.
External source link
Before
https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.d8fa289546b052f03504274c60a2a72ef0df6e80.001.1
After
https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.b97b0d01856d55ff43e9b9c195116bedd6cb2b0e.002.2
Bulletin issued: 16 October 2026 at 06:51 UTC
View saved version 3
Original saved fields, unchanged. This is our record, not an archived copy of the external webpage.
{ "id": "nws:60af71cbaed2cfecf53e3006", "authorityId": "urn:oid:2.49.0.1.840.0.b97b0d01856d55ff43e9b9c195116bedd6cb2b0e.002.2", "sender": "w-nws.webmaster@noaa.gov", "references": [ { "identifier": "urn:oid:2.49.0.1.840.0.d8fa289546b052f03504274c60a2a72ef0df6e80.001.1", "sender": "w-nws.webmaster@noaa.gov" } ], "category": "weather", "title": "Typhoon Watch issued October 16 at 4:51PM ChST by NWS Tiyan GU", "eventType": "Typhoon Watch", "occurredAt": "2026-10-16T06:51:00.000Z", "issuedAt": "2026-10-16T06:51:00.000Z", "timeBasis": "Bulletin issued", "effectiveAt": "2026-10-16T06:51:00.000Z", "onsetAt": "2026-10-16T06:51:00.000Z", "expiresAt": "2026-10-16T21:00:00.000Z", "forecastEndAt": null, "severity": "Severe", "urgency": "Future", "certainty": "Possible", "messageType": "Update", "status": "Source update", "place": "Tinian Coastal Waters; Saipan Coastal Waters", "coordinates": null, "issuer": "NWS Tiyan GU", "summary": "Typhoon Watch · Tinian Coastal Waters; Saipan Coastal Waters. Severe; possible; urgency: future.", "description": "* WHAT...Tropical storm conditions, including winds of 34 to 63\nknots, are expected. Typhoon conditions, including winds of 64\nknots or more are possible within the next 48 hours.\n\n* WHERE...Tinian and Saipan Coastal Waters.\n\n* WHEN...Onset of damaging winds beginning Saturday night,\ncontinuing into at least Sunday night, possibly longer if\nconditions warrant.\n\n* IMPACTS...Destructive winds will produce dangerous seas that\ncould damage, capsize or sink vessels, along with drastically\nreducing visibilities in heavy rain.\n\n* ADDITIONAL DETAILS...Tropical Storm Champi (29W) continues to\nmove quickly toward the Marianas. The exact path of 29W remains\nsubject to change. However, guidance supports a passage through\nGuam coastal waters, with damaging winds moving into Tinian and\nSaipan Saturday night and lasting into at least Sunday night.\nChampi is expected to strengthen further today and Saturday as\nit approaches, then move through the region as a typhoon Sunday\nmorning. Seas will quickly rise, with significant sea heights\nreaching as high as 25 feet during closest passage of Champi.\nDangerous sea conditions may continue into Monday.", "instruction": "Prepare for tropical storm\nforce conditions Sunday morning. Secure all vessels. Conditions\nare expected to be catastrophic for small craft, and extremely\ndangerous for any vessels of larger size. As Tropical Storm Champi\napproaches the Marianas, stay in safe harbor.", "url": "https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.b97b0d01856d55ff43e9b9c195116bedd6cb2b0e.002.2", "source": "nws", "sourceName": "NOAA NWS" }
Visit the external source ↗
The external page may have changed since this version was saved.
Saved by us
15 October 2026 at 23:02 UTC
Version 2
Source status changed
Title
Before
Typhoon Watch issued October 16 at 12:25AM ChST by NWS Tiyan GU
After
Typhoon Watch issued October 16 at 8:56AM ChST by NWS Tiyan GU
Source updated
Before
15 October 2026 at 14:25 UTC
After
15 October 2026 at 22:56 UTC
Effective from
Before
15 October 2026 at 14:25 UTC
After
15 October 2026 at 22:56 UTC
Forecast onset
Before
15 October 2026 at 14:25 UTC
After
15 October 2026 at 22:56 UTC
Message expiry
Before
16 October 2026 at 06:00 UTC
After
16 October 2026 at 08:00 UTC
Message type
Before
Alert
After
Update
Source status
Before
Source alert
After
Source update
Official description
Before
…long with drastically reducing visibilities in heavy rain. * ADDITIONAL DETAILS...Tropical Storm Champi (29W) is still moving toward the Marianas. The exact path of 29W remains subject to change, however, it is expected to pass through the coastal waters over the weekend. TS 29W is expected to strengthen further today as it approaches, moving through the region as at least a category 1 typhoon, but more likely stronger.
After
…long with drastically reducing visibilities in heavy rain. * ADDITIONAL DETAILS...Tropical Storm Champi (29W) is still inching closer to the Marianas. The exact path of 29W remains subject to change. However, it is expected to pass through the coastal waters over the weekend. Champi is expected to strengthen further today as it approaches, expected to move through the region as at least a category 1 typhoon, with higher likelihood of being stronger.
Official instructions
Before
Mariners should pay close attention to the marine forecast and ~~consider wind and sea conditions in planning. Remain in port, seek safe harbor and/or secure your vessel for severe wind and~~ seas.
After
Mariners should pay close attention to the marine forecast and consider wind and sea conditions in planning. Remain in port, seek safe harbor and/or secure your vessel for severe wind and seas.
External source link
Before
https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.52dbe29135fa6cbe6ee88511948ce51c12a518fc.001.1
After
https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.d8fa289546b052f03504274c60a2a72ef0df6e80.001.1
Bulletin issued: 15 October 2026 at 22:56 UTC
View saved version 2
Original saved fields, unchanged. This is our record, not an archived copy of the external webpage.
{ "id": "nws:31dd977a049da076d97f9dc4", "authorityId": "urn:oid:2.49.0.1.840.0.d8fa289546b052f03504274c60a2a72ef0df6e80.001.1", "sender": "w-nws.webmaster@noaa.gov", "references": [ { "identifier": "urn:oid:2.49.0.1.840.0.52dbe29135fa6cbe6ee88511948ce51c12a518fc.001.1", "sender": "w-nws.webmaster@noaa.gov" } ], "category": "weather", "title": "Typhoon Watch issued October 16 at 8:56AM ChST by NWS Tiyan GU", "eventType": "Typhoon Watch", "occurredAt": "2026-10-15T22:56:00.000Z", "issuedAt": "2026-10-15T22:56:00.000Z", "timeBasis": "Bulletin issued", "effectiveAt": "2026-10-15T22:56:00.000Z", "onsetAt": "2026-10-15T22:56:00.000Z", "expiresAt": "2026-10-16T08:00:00.000Z", "forecastEndAt": null, "severity": "Severe", "urgency": "Future", "certainty": "Possible", "messageType": "Update", "status": "Source update", "place": "Guam Coastal Waters; Rota Coastal Waters; Tinian Coastal Waters; Saipan Coastal Waters", "coordinates": null, "issuer": "NWS Tiyan GU", "summary": "Typhoon Watch · Guam Coastal Waters; Rota Coastal Waters; Tinian Coastal Waters; Saipan Coastal Waters. Severe; possible; urgency: future.", "description": "* WHAT...Typhoon conditions, including winds of 64 knots or more\nare possible within the next 48 hours.\n\n* WHERE...Guam, Rota, Tinian and Saipan Coastal Waters.\n\n* WHEN...Through at least Sunday night, possibly longer if\nconditions warrant.\n\n* IMPACTS...Destructive winds will produce dangerous seas that\ncould damage, capsize or sink vessels, along with drastically\nreducing visibilities in heavy rain.\n\n* ADDITIONAL DETAILS...Tropical Storm Champi (29W) is still inching\ncloser to the Marianas. The exact path of 29W remains subject to\nchange. However, it is expected to pass through the coastal waters\nover the weekend. Champi is expected to strengthen further today as\nit approaches, expected to move through the region as at least a\ncategory 1 typhoon, with higher likelihood of being stronger.", "instruction": "Mariners should pay close attention to the marine forecast and consider\nwind and sea conditions in planning. Remain in port, seek safe harbor\nand/or secure your vessel for severe wind and seas.", "url": "https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.d8fa289546b052f03504274c60a2a72ef0df6e80.001.1", "source": "nws", "sourceName": "NOAA NWS" }
Visit the external source ↗
The external page may have changed since this version was saved.

First saved record · 15 October 2026 at 14:28 UTC

Saved by us

15 October 2026 at 14:28 UTC

Starting point

First saved record

Our first saved version of Typhoon Watch issued October 16 at 12:25AM ChST by NWS Tiyan GU. We have no earlier saved version to compare.

Bulletin issued: 15 October 2026 at 14:25 UTC

View saved version 1

Original saved fields, unchanged. This is our record, not an archived copy of the external webpage.

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  "id": "nws:46efc858aa088e9116e0242b",
  "authorityId": "urn:oid:2.49.0.1.840.0.52dbe29135fa6cbe6ee88511948ce51c12a518fc.001.1",
  "sender": "w-nws.webmaster@noaa.gov",
  "references": [],
  "category": "weather",
  "title": "Typhoon Watch issued October 16 at 12:25AM ChST by NWS Tiyan GU",
  "eventType": "Typhoon Watch",
  "occurredAt": "2026-10-15T14:25:00.000Z",
  "issuedAt": "2026-10-15T14:25:00.000Z",
  "timeBasis": "Bulletin issued",
  "effectiveAt": "2026-10-15T14:25:00.000Z",
  "onsetAt": "2026-10-15T14:25:00.000Z",
  "expiresAt": "2026-10-16T06:00:00.000Z",
  "forecastEndAt": null,
  "severity": "Severe",
  "urgency": "Future",
  "certainty": "Possible",
  "messageType": "Alert",
  "status": "Source alert",
  "place": "Guam Coastal Waters; Rota Coastal Waters; Tinian Coastal Waters; Saipan Coastal Waters",
  "coordinates": null,
  "issuer": "NWS Tiyan GU",
  "summary": "Typhoon Watch · Guam Coastal Waters; Rota Coastal Waters; Tinian Coastal Waters; Saipan Coastal Waters. Severe; possible; urgency: future.",
  "description": "* WHAT...Typhoon conditions, including winds of 64 knots or more\nare possible within the next 48 hours.\n\n* WHERE...Guam, Rota, Tinian and Saipan Coastal Waters.\n\n* WHEN...Through at least Sunday night, possibly longer if\nconditions warrant.\n\n* IMPACTS...Destructive winds will produce dangerous seas that\ncould damage, capsize or sink vessels, along with drastically\nreducing visibilities in heavy rain.\n\n* ADDITIONAL DETAILS...Tropical Storm Champi (29W) is still moving\ntoward the Marianas. The exact path of 29W remains subject to\nchange, however, it is expected to pass through the coastal waters\nover the weekend. TS 29W is expected to strengthen further today\nas it approaches, moving through the region as at least a category\n1 typhoon, but more likely stronger.",
  "instruction": "Mariners should pay close attention to the marine forecast and\nconsider wind and sea conditions in planning. Remain in port,\nseek safe harbor and/or secure your vessel for severe wind and\nseas.",
  "url": "https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.52dbe29135fa6cbe6ee88511948ce51c12a518fc.001.1",
  "source": "nws",
  "sourceName": "NOAA NWS"
}

Visit the external source ↗

The external page may have changed since this version was saved.