NOAA NWS / Event history

Typhoon Warning issued October 18 at 12:31PM ChST by NWS Tiyan GU

Typhoon Warning · Guam Coastal Waters; Rota Coastal Waters. Extreme; likely; urgency: immediate.

See what changed ↓Detailed event record ↗

Bulletin issued: 18 October 2026 at 02:31 UTC
First saved by us: 17 October 2026 at 01:17 UTC
Last included in a daily record: 18 October 2026
The linked daily edition preserves what we captured that UTC day; this event page is not a live warning.
Source classification: Extreme · 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 · Guam Coastal Waters; Rota Coastal Waters
Certainty / urgency: Likely / Immediate
Message expiry (not hazard end): 18 October 2026 at 16:45 UTC
Forecast onset / end: 18 October 2026 at 02:31 UTC / Not supplied

Archived official description

* WHAT...Typhoon conditions, including winds of 64 knots or more will continue for Guam. Tropical storm conditions will continue for Rota. * WHERE...Guam and Rota Coastal Waters. * WHEN...Destructive typhoon force winds are occurring in western waters of Guam, but will decrease as Champi moves farther west away from the Marianas. The eye of Champi is now well outside of the coastal waters to the west. Damaging winds will continue through today. * IMPACTS...Destructive typhoon force and tropical storm force winds will produce dangerous to deadly seas that could damage, capsize or sink vessels, along with drastically reducing visibilities in heavy rain. * ADDITIONAL DETAILS...Super Typhoon Champi (29W) continues to move quickly away from the Marianas as a Category 4 Super Typhoon. Seas are expected to remain hazardous through tonight, with significant sea heights as high as 24 feet over Guam coastal waters and 20 feet over Rota coastal waters. Dangerous sea conditions may continue into Monday.

Instructions in this archived message

Conditions will remain catastrophic for small craft, and extremely dangerous for any vessels of larger size over western waters of Guam and Rota. Waters will remain hazardous across the remainder of the waters. Stay in safe harbor until the all clear is given.

The saved record

What changed

4 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 the latest 3 changes

Saved by us
18 October 2026 at 02:32 UTC
Version 5
7 recorded details changed
Title
Before
Typhoon Warning issued October 18 at 9:49AM ChST by NWS Tiyan GU
After
Typhoon Warning issued October 18 at 12:31PM ChST by NWS Tiyan GU
Source updated
Before
17 October 2026 at 23:49 UTC
After
18 October 2026 at 02:31 UTC
Effective from
Before
17 October 2026 at 23:49 UTC
After
18 October 2026 at 02:31 UTC
Forecast onset
Before
17 October 2026 at 23:49 UTC
After
18 October 2026 at 02:31 UTC
Message expiry
Before
18 October 2026 at 08:00 UTC
After
18 October 2026 at 16:45 UTC
Official description
Before
* WHAT...Typhoon conditions, including winds of 64 knots or more will continue through this morning for Guam. Tropical Storm conditons will continue this morning for Rota. * WHERE...Guam and Rota Coastal Waters. * WHEN...Destructive typhoon force winds are occurring in western waters of Guam, but will decrease as Champi moves farther west out of the waters. The eye of Champi is now well outside of the coastal waters to the west. Damaging winds will continue into this evening, possibly to midnight. * IMPACTS...Destructive typhoon force and tropical storm force winds will produce dangerous to deadly seas that could damage, capsize or sink vessels, along with drastically reducing visibilities in heavy rain. * ADDITIONAL DETAILS...Super Typhoon Champi (29W) continues to move quickly away from the Marianas. Champi passed close to the southern tip of Guam, less than 10 NM, as a strong Category 4 storm. Champi is expected to strengthen further as it moves through the Philippine Sea, possibly becoming a Category 5 super typhoon. Seas are expected to remain hazardous through at least tonight, with significant sea heights as high as 24 feet over western waters, closest to Champi. Dangerous sea conditions may continue into Monday.
After
* WHAT...Typhoon conditions, including winds of 64 knots or more will continue for Guam. Tropical storm conditions will continue for Rota. * WHERE...Guam and Rota Coastal Waters. * WHEN...Destructive typhoon force winds are occurring in western waters of Guam, but will decrease as Champi moves farther west away from the Marianas. The eye of Champi is now well outside of the coastal waters to the west. Damaging winds will continue through today. * IMPACTS...Destructive typhoon force and tropical storm force winds will produce dangerous to deadly seas that could damage, capsize or sink vessels, along with drastically reducing visibilities in heavy rain. * ADDITIONAL DETAILS...Super Typhoon Champi (29W) continues to move quickly away from the Marianas as a Category 4 Super Typhoon. Seas are expected to remain hazardous through tonight, with significant sea heights as high as 24 feet over Guam coastal waters and 20 feet over Rota coastal waters. Dangerous sea conditions may continue into Monday.
External source link
Before
https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.ac8a36714d6dc33ab808bcc106b090cac84e1996.001.1
After
https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.e7805b64914da1d13a75d65ab92d934c9da2f0d1.002.1
Bulletin issued: 18 October 2026 at 02:31 UTC
View saved version 5
Original saved fields, unchanged. This is our record, not an archived copy of the external webpage.
{ "id": "nws:28dc4ba907a0a67c6749aba0", "authorityId": "urn:oid:2.49.0.1.840.0.e7805b64914da1d13a75d65ab92d934c9da2f0d1.002.1", "sender": "w-nws.webmaster@noaa.gov", "references": [ { "identifier": "urn:oid:2.49.0.1.840.0.a9f4b231049ab76a71294bc08232e608b3a70e05.001.1", "sender": "w-nws.webmaster@noaa.gov" }, { "identifier": "urn:oid:2.49.0.1.840.0.ac8a36714d6dc33ab808bcc106b090cac84e1996.001.1", "sender": "w-nws.webmaster@noaa.gov" } ], "category": "weather", "title": "Typhoon Warning issued October 18 at 12:31PM ChST by NWS Tiyan GU", "eventType": "Typhoon Warning", "occurredAt": "2026-10-18T02:31:00.000Z", "issuedAt": "2026-10-18T02:31:00.000Z", "timeBasis": "Bulletin issued", "effectiveAt": "2026-10-18T02:31:00.000Z", "onsetAt": "2026-10-18T02:31:00.000Z", "expiresAt": "2026-10-18T16:45:00.000Z", "forecastEndAt": null, "severity": "Extreme", "urgency": "Immediate", "certainty": "Likely", "messageType": "Update", "status": "Source update", "place": "Guam Coastal Waters; Rota Coastal Waters", "coordinates": null, "issuer": "NWS Tiyan GU", "summary": "Typhoon Warning · Guam Coastal Waters; Rota Coastal Waters. Extreme; likely; urgency: immediate.", "description": "* WHAT...Typhoon conditions, including winds of 64 knots or more will\ncontinue for Guam. Tropical storm conditions will continue for\nRota.\n\n* WHERE...Guam and Rota Coastal Waters.\n\n* WHEN...Destructive typhoon force winds are occurring in western\nwaters of Guam, but will decrease as Champi moves farther west away\nfrom the Marianas. The eye of Champi is now well outside of the\ncoastal waters to the west. Damaging winds will continue through\ntoday.\n\n* IMPACTS...Destructive typhoon force and tropical storm force winds\nwill produce dangerous to deadly seas that could damage, capsize or\nsink vessels, along with drastically reducing visibilities in heavy\nrain.\n\n* ADDITIONAL DETAILS...Super Typhoon Champi (29W) continues to move\nquickly away from the Marianas as a Category 4 Super Typhoon. Seas\nare expected to remain hazardous through tonight, with significant\nsea heights as high as 24 feet over Guam coastal waters and 20\nfeet over Rota coastal waters. Dangerous sea conditions may\ncontinue into Monday.", "instruction": "Conditions will remain catastrophic for small craft, and extremely\ndangerous for any vessels of larger size over western waters of Guam\nand Rota. Waters will remain hazardous across the remainder of the\nwaters. Stay in safe harbor until the all clear is given.", "url": "https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.e7805b64914da1d13a75d65ab92d934c9da2f0d1.002.1", "source": "nws", "sourceName": "NOAA NWS" }
Visit the external source ↗
The external page may have changed since this version was saved.
Saved by us
18 October 2026 at 00:02 UTC
Version 4
8 recorded details changed
Title
Before
Typhoon Warning issued October 17 at 10:39PM ChST by NWS Tiyan GU
After
Typhoon Warning issued October 18 at 9:49AM ChST by NWS Tiyan GU
Source updated
Before
17 October 2026 at 12:39 UTC
After
17 October 2026 at 23:49 UTC
Effective from
Before
17 October 2026 at 12:39 UTC
After
17 October 2026 at 23:49 UTC
Forecast onset
Before
17 October 2026 at 12:39 UTC
After
17 October 2026 at 23:49 UTC
Message expiry
Before
18 October 2026 at 02:45 UTC
After
18 October 2026 at 08:00 UTC
Official description
Before
* WHAT...Typhoon conditions, including winds of 64 knots or more are expected. * WHERE...Guam and Rota Coastal Waters. * WHEN...Damaging winds are occurring in eastern waters, and will begin later tonight in western waters. Onset of destructive winds after midnight with typhoon force winds early Sunday morning. Damaging winds will continue into at least Sunday night, especially if Champi slows down. * IMPACTS...Destructive to typhoon force winds will produce dangerous to deadly seas that could damage, capsize or sink vessels, along with drastically reducing visibilities in heavy rain. * ADDITIONAL DETAILS...Typhoon 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, a little south of Guam, with damaging winds moving in late tonight and lasting into at least Sunday night. Champi is expected to strengthen further as it approaches, then move through the region as a category 4 super typhoon Sunday morning. Seas are quickly rising, with significant sea heights reaching as high as 35 feet near the eye wall of Champi. Dangerous sea conditions may continue into Monday.
After
* WHAT...Typhoon conditions, including winds of 64 knots or more will continue through this morning for Guam. Tropical Storm conditons will continue this morning for Rota. * WHERE...Guam and Rota Coastal Waters. * WHEN...Destructive typhoon force winds are occurring in western waters of Guam, but will decrease as Champi moves farther west out of the waters. The eye of Champi is now well outside of the coastal waters to the west. Damaging winds will continue into this evening, possibly to midnight. * IMPACTS...Destructive typhoon force and tropical storm force winds will produce dangerous to deadly seas that could damage, capsize or sink vessels, along with drastically reducing visibilities in heavy rain. * ADDITIONAL DETAILS...Super Typhoon Champi (29W) continues to move quickly away from the Marianas. Champi passed close to the southern tip of Guam, less than 10 NM, as a strong Category 4 storm. Champi is expected to strengthen further as it moves through the Philippine Sea, possibly becoming a Category 5 super typhoon. Seas are expected to remain hazardous through at least tonight, with significant sea heights as high as 24 feet over western waters, closest to Champi. Dangerous sea conditions may continue into Monday.
Official instructions
Before
Prepare for the passage of a category 4 typhoon Sunday morning. Secure all vessels. Conditions are expected to be catastrophic for small craft, and extremely dangerous for any vessels of larger size. As Typhoon Champi approaches, stay in safe harbor.
After
Conditions will remain catastrophic for small craft, and extremely dangerous for any vessels of larger size over western waters of Guam and Rota. Waters will remain hazardous across the remainder of the waters. Stay in safe harbor until the all clear is given.
External source link
Before
https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.a9f4b231049ab76a71294bc08232e608b3a70e05.001.1
After
https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.ac8a36714d6dc33ab808bcc106b090cac84e1996.001.1
Bulletin issued: 17 October 2026 at 23:49 UTC
View saved version 4
Original saved fields, unchanged. This is our record, not an archived copy of the external webpage.
{ "id": "nws:a4c040f0f16b8d832132f404", "authorityId": "urn:oid:2.49.0.1.840.0.ac8a36714d6dc33ab808bcc106b090cac84e1996.001.1", "sender": "w-nws.webmaster@noaa.gov", "references": [ { "identifier": "urn:oid:2.49.0.1.840.0.a9f4b231049ab76a71294bc08232e608b3a70e05.001.1", "sender": "w-nws.webmaster@noaa.gov" } ], "category": "weather", "title": "Typhoon Warning issued October 18 at 9:49AM ChST by NWS Tiyan GU", "eventType": "Typhoon Warning", "occurredAt": "2026-10-17T23:49:00.000Z", "issuedAt": "2026-10-17T23:49:00.000Z", "timeBasis": "Bulletin issued", "effectiveAt": "2026-10-17T23:49:00.000Z", "onsetAt": "2026-10-17T23:49:00.000Z", "expiresAt": "2026-10-18T08:00:00.000Z", "forecastEndAt": null, "severity": "Extreme", "urgency": "Immediate", "certainty": "Likely", "messageType": "Update", "status": "Source update", "place": "Guam Coastal Waters; Rota Coastal Waters", "coordinates": null, "issuer": "NWS Tiyan GU", "summary": "Typhoon Warning · Guam Coastal Waters; Rota Coastal Waters. Extreme; likely; urgency: immediate.", "description": "* WHAT...Typhoon conditions, including winds of 64 knots or more will\ncontinue through this morning for Guam. Tropical Storm conditons\nwill continue this morning for Rota.\n\n* WHERE...Guam and Rota Coastal Waters.\n\n* WHEN...Destructive typhoon force winds are occurring in western\nwaters of Guam, but will decrease as Champi moves farther west out\nof the waters. The eye of Champi is now well outside of the coastal\nwaters to the west. Damaging winds will continue into this\nevening, possibly to midnight.\n\n* IMPACTS...Destructive typhoon force and tropical storm force winds\nwill produce dangerous to deadly seas that could damage, capsize\nor sink vessels, along with drastically reducing visibilities in\nheavy rain.\n\n* ADDITIONAL DETAILS...Super Typhoon Champi (29W) continues to move\nquickly away from the Marianas. Champi passed close to the southern\ntip of Guam, less than 10 NM, as a strong Category 4 storm. Champi\nis expected to strengthen further as it moves through the\nPhilippine Sea, possibly becoming a Category 5 super typhoon. Seas\nare expected to remain hazardous through at least tonight, with\nsignificant sea heights as high as 24 feet over western waters,\nclosest to Champi. Dangerous sea conditions may continue into\nMonday.", "instruction": "Conditions will remain catastrophic for small craft, and extremely\ndangerous for any vessels of larger size over western waters of Guam\nand Rota. Waters will remain hazardous across the remainder of the\nwaters. Stay in safe harbor until the all clear is given.", "url": "https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.ac8a36714d6dc33ab808bcc106b090cac84e1996.001.1", "source": "nws", "sourceName": "NOAA NWS" }
Visit the external source ↗
The external page may have changed since this version was saved.
Saved by us
17 October 2026 at 12:47 UTC
Version 3
8 recorded details changed
Title
Before
Typhoon Warning issued October 17 at 3:37PM ChST by NWS Tiyan GU
After
Typhoon Warning issued October 17 at 10:39PM ChST by NWS Tiyan GU
Source updated
Before
17 October 2026 at 05:37 UTC
After
17 October 2026 at 12:39 UTC
Effective from
Before
17 October 2026 at 05:37 UTC
After
17 October 2026 at 12:39 UTC
Forecast onset
Before
17 October 2026 at 05:37 UTC
After
17 October 2026 at 12:39 UTC
Message expiry
Before
17 October 2026 at 13:00 UTC
After
18 October 2026 at 02:45 UTC
Official description
Before
…HAT...Typhoon conditions, including winds of 64 knots or more are expected. * WHERE...Guam and Rota Coastal Waters. * WHEN...Onset of damaging winds beginning tonight. Onset of destructive winds after midnight with typhoon force winds early Sunday morning. Damaging winds will continue into at least Sunday night, if Champi slows down. * IMPACTS...Destructive to typhoon force winds will produce dangerous to deadly seas that could damage, capsize or sink vessels, along with drastically reducing visibilities in heavy rain. * ADDITIONAL DETAILS...Typhoon 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 near the southern tip of Guam, with damaging winds moving in late tonight and lasting into at least Sunday night. Champi is expected to strengthen further today as it approaches, then move through the region as a Category 3 typhoon Sunday morning. Seas are quickly rising, with significant sea heights reaching as high as 35 feet near the eye wall of Champi. Dangerous sea conditions may continue into Monday.
After
…HAT...Typhoon conditions, including winds of 64 knots or more are expected. * WHERE...Guam and Rota Coastal Waters. * WHEN...Damaging winds are occurring in eastern waters, and will begin later tonight in western waters. Onset of destructive winds after midnight with typhoon force winds early Sunday morning. Damaging winds will continue into at least Sunday night, especially if Champi slows down. * IMPACTS...Destructive to typhoon force winds will produce dangerous to deadly seas that could damage, capsize or sink vessels, along with drastically reducing visibilities in heavy rain. * ADDITIONAL DETAILS...Typhoon 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, a little south of Guam, with damaging winds moving in late tonight and lasting into at least Sunday night. Champi is expected to strengthen further as it approaches, then move through the region as a category 4 super typhoon Sunday morning. Seas are quickly rising, with significant sea heights reaching as high as 35 feet near the eye wall of Champi. Dangerous sea conditions may continue into Monday.
Official instructions
Before
Prepare for the passage of a Category 3 or 4 typhoon Sunday morning. Secure all vessels. Conditions are expected to be catastrophic for small craft, and extremely dangerous for any vessels of larger size. As Typhoon Champi approaches, stay in safe harbor.
After
Prepare for the passage of a category 4 typhoon Sunday morning. Secure all vessels. Conditions are expected to be catastrophic for small craft, and extremely dangerous for any vessels of larger size. As Typhoon Champi approaches, stay in safe harbor.
External source link
Before
https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.7e3672d6c8c3f35288f5cc084bf33e3c014354b9.001.1
After
https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.a9f4b231049ab76a71294bc08232e608b3a70e05.001.1
Bulletin issued: 17 October 2026 at 12:39 UTC
View saved version 3
Original saved fields, unchanged. This is our record, not an archived copy of the external webpage.
{ "id": "nws:aaff18d7cd1bc6285c252fb6", "authorityId": "urn:oid:2.49.0.1.840.0.a9f4b231049ab76a71294bc08232e608b3a70e05.001.1", "sender": "w-nws.webmaster@noaa.gov", "references": [ { "identifier": "urn:oid:2.49.0.1.840.0.f99702882a0d777b34053b53227abd132c15cfbd.001.1", "sender": "w-nws.webmaster@noaa.gov" }, { "identifier": "urn:oid:2.49.0.1.840.0.7e3672d6c8c3f35288f5cc084bf33e3c014354b9.001.1", "sender": "w-nws.webmaster@noaa.gov" } ], "category": "weather", "title": "Typhoon Warning issued October 17 at 10:39PM ChST by NWS Tiyan GU", "eventType": "Typhoon Warning", "occurredAt": "2026-10-17T12:39:00.000Z", "issuedAt": "2026-10-17T12:39:00.000Z", "timeBasis": "Bulletin issued", "effectiveAt": "2026-10-17T12:39:00.000Z", "onsetAt": "2026-10-17T12:39:00.000Z", "expiresAt": "2026-10-18T02:45:00.000Z", "forecastEndAt": null, "severity": "Extreme", "urgency": "Immediate", "certainty": "Likely", "messageType": "Update", "status": "Source update", "place": "Guam Coastal Waters; Rota Coastal Waters", "coordinates": null, "issuer": "NWS Tiyan GU", "summary": "Typhoon Warning · Guam Coastal Waters; Rota Coastal Waters. Extreme; likely; urgency: immediate.", "description": "* WHAT...Typhoon conditions, including winds of 64 knots or more\nare expected.\n\n* WHERE...Guam and Rota Coastal Waters.\n\n* WHEN...Damaging winds are occurring in eastern waters, and will\nbegin later tonight in western waters. Onset of destructive winds\nafter midnight with typhoon force winds early Sunday morning.\nDamaging winds will continue into at least Sunday night, especially\nif Champi slows down.\n\n* IMPACTS...Destructive to typhoon force winds will produce\ndangerous to deadly seas that could damage, capsize or sink\nvessels, along with drastically reducing visibilities in heavy\nrain.\n\n* ADDITIONAL DETAILS...Typhoon Champi (29W) continues to move quickly\ntoward the Marianas. The exact path of 29W remains subject to\nchange. However, guidance supports a passage through Guam coastal\nwaters, a little south of Guam, with damaging winds moving in late\ntonight and lasting into at least Sunday night. Champi is expected\nto strengthen further as it approaches, then move through the\nregion as a category 4 super typhoon Sunday morning. Seas are\nquickly rising, with significant sea heights reaching as high as\n35 feet near the eye wall of Champi. Dangerous sea conditions may\ncontinue into Monday.", "instruction": "Prepare for the passage of a\ncategory 4 typhoon Sunday morning. Secure all vessels. Conditions are\nexpected to be catastrophic for small craft, and extremely dangerous\nfor any vessels of larger size. As Typhoon Champi approaches, stay\nin safe harbor.", "url": "https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.a9f4b231049ab76a71294bc08232e608b3a70e05.001.1", "source": "nws", "sourceName": "NOAA NWS" }
Visit the external source ↗
The external page may have changed since this version was saved.

Show 1 earlier update

Saved by us
17 October 2026 at 05:47 UTC
Version 2
Source status changed
Title
Before
Typhoon Warning issued October 17 at 11:12AM ChST by NWS Tiyan GU
After
Typhoon Warning issued October 17 at 3:37PM ChST by NWS Tiyan GU
Source updated
Before
17 October 2026 at 01:12 UTC
After
17 October 2026 at 05:37 UTC
Effective from
Before
17 October 2026 at 01:12 UTC
After
17 October 2026 at 05:37 UTC
Forecast onset
Before
17 October 2026 at 01:12 UTC
After
17 October 2026 at 05:37 UTC
Message expiry
Before
17 October 2026 at 20:00 UTC
After
17 October 2026 at 13:00 UTC
Message type
Before
Alert
After
Update
Source status
Before
Source alert
After
Source update
Official description
Before
* WHAT....Typhoon conditions, including winds of 64 knots or more are expected. * WHERE...Guam and Rota Coastal Waters. * WHEN...Onset of damaging winds beginning Saturday night. Onset of destructive winds Sunday morning. Damaging winds will continue 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...Typhoon 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 in late tonight and lasting into at least Sunday night. Champi is expected to strengthen further today 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 35 feet during closest passage of Champi. Dangerous sea conditions may continue into Monday.
After
* WHAT...Typhoon conditions, including winds of 64 knots or more are expected. * WHERE...Guam and Rota Coastal Waters. * WHEN...Onset of damaging winds beginning tonight. Onset of destructive winds after midnight with typhoon force winds early Sunday morning. Damaging winds will continue into at least Sunday night, if Champi slows down. * IMPACTS...Destructive to typhoon force winds will produce dangerous to deadly seas that could damage, capsize or sink vessels, along with drastically reducing visibilities in heavy rain. * ADDITIONAL DETAILS...Typhoon 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 near the southern tip of Guam, with damaging winds moving in late tonight and lasting into at least Sunday night. Champi is expected to strengthen further today as it approaches, then move through the region as a Category 3 typhoon Sunday morning. Seas are quickly rising, with significant sea heights reaching as high as 35 feet near the eye wall of Champi. Dangerous sea conditions may continue into Monday.
Official instructions
Before
Prepare for the passage of a typhoon 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, stay in safe harbor.
After
Prepare for the passage of a Category 3 or 4 typhoon Sunday morning. Secure all vessels. Conditions are expected to be catastrophic for small craft, and extremely dangerous for any vessels of larger size. As Typhoon Champi approaches, stay in safe harbor.
External source link
Before
https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.f99702882a0d777b34053b53227abd132c15cfbd.001.1
After
https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.7e3672d6c8c3f35288f5cc084bf33e3c014354b9.001.1
Bulletin issued: 17 October 2026 at 05:37 UTC
View saved version 2
Original saved fields, unchanged. This is our record, not an archived copy of the external webpage.
{ "id": "nws:bcdd628e4a48d6cde77eade8", "authorityId": "urn:oid:2.49.0.1.840.0.7e3672d6c8c3f35288f5cc084bf33e3c014354b9.001.1", "sender": "w-nws.webmaster@noaa.gov", "references": [ { "identifier": "urn:oid:2.49.0.1.840.0.f99702882a0d777b34053b53227abd132c15cfbd.001.1", "sender": "w-nws.webmaster@noaa.gov" } ], "category": "weather", "title": "Typhoon Warning issued October 17 at 3:37PM ChST by NWS Tiyan GU", "eventType": "Typhoon Warning", "occurredAt": "2026-10-17T05:37:00.000Z", "issuedAt": "2026-10-17T05:37:00.000Z", "timeBasis": "Bulletin issued", "effectiveAt": "2026-10-17T05:37:00.000Z", "onsetAt": "2026-10-17T05:37:00.000Z", "expiresAt": "2026-10-17T13:00:00.000Z", "forecastEndAt": null, "severity": "Extreme", "urgency": "Immediate", "certainty": "Likely", "messageType": "Update", "status": "Source update", "place": "Guam Coastal Waters; Rota Coastal Waters", "coordinates": null, "issuer": "NWS Tiyan GU", "summary": "Typhoon Warning · Guam Coastal Waters; Rota Coastal Waters. Extreme; likely; urgency: immediate.", "description": "* WHAT...Typhoon conditions, including winds of 64 knots or more\nare expected.\n\n* WHERE...Guam and Rota Coastal Waters.\n\n* WHEN...Onset of damaging winds beginning tonight. Onset of\ndestructive winds after midnight with typhoon force winds early\nSunday morning. Damaging winds will continue into at least Sunday\nnight, if Champi slows down.\n\n* IMPACTS...Destructive to typhoon force winds will produce dangerous\nto deadly seas that could damage, capsize or sink vessels, along\nwith drastically reducing visibilities in heavy rain.\n\n* ADDITIONAL DETAILS...Typhoon Champi (29W) continues to move quickly\ntoward the Marianas. The exact path of 29W remains subject to\nchange. However, guidance supports a passage through Guam coastal\nwaters near the southern tip of Guam, with damaging winds moving in\nlate tonight and lasting into at least Sunday night. Champi is\nexpected to strengthen further today as it approaches, then move\nthrough the region as a Category 3 typhoon Sunday morning. Seas\nare quickly rising, with significant sea heights reaching as high\nas 35 feet near the eye wall of Champi. Dangerous sea conditions\nmay continue into Monday.", "instruction": "Prepare for the passage of a Category 3 or 4 typhoon Sunday morning.\nSecure all vessels. Conditions are expected to be catastrophic for\nsmall craft, and extremely dangerous for any vessels of larger size.\nAs Typhoon Champi approaches, stay in safe harbor.", "url": "https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.7e3672d6c8c3f35288f5cc084bf33e3c014354b9.001.1", "source": "nws", "sourceName": "NOAA NWS" }
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First saved record · 17 October 2026 at 01:17 UTC

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17 October 2026 at 01:17 UTC

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Our first saved version of Typhoon Warning issued October 17 at 11:12AM ChST by NWS Tiyan GU. We have no earlier saved version to compare.

Bulletin issued: 17 October 2026 at 01:12 UTC

View saved version 1

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

{
  "id": "nws:5cf1684ae9b47d988cb165b1",
  "authorityId": "urn:oid:2.49.0.1.840.0.f99702882a0d777b34053b53227abd132c15cfbd.001.1",
  "sender": "w-nws.webmaster@noaa.gov",
  "references": [],
  "category": "weather",
  "title": "Typhoon Warning issued October 17 at 11:12AM ChST by NWS Tiyan GU",
  "eventType": "Typhoon Warning",
  "occurredAt": "2026-10-17T01:12:00.000Z",
  "issuedAt": "2026-10-17T01:12:00.000Z",
  "timeBasis": "Bulletin issued",
  "effectiveAt": "2026-10-17T01:12:00.000Z",
  "onsetAt": "2026-10-17T01:12:00.000Z",
  "expiresAt": "2026-10-17T20:00:00.000Z",
  "forecastEndAt": null,
  "severity": "Extreme",
  "urgency": "Immediate",
  "certainty": "Likely",
  "messageType": "Alert",
  "status": "Source alert",
  "place": "Guam Coastal Waters; Rota Coastal Waters",
  "coordinates": null,
  "issuer": "NWS Tiyan GU",
  "summary": "Typhoon Warning · Guam Coastal Waters; Rota Coastal Waters. Extreme; likely; urgency: immediate.",
  "description": "* WHAT....Typhoon conditions, including winds of 64 knots or more\nare expected.\n\n* WHERE...Guam and Rota Coastal Waters.\n\n* WHEN...Onset of damaging winds beginning Saturday night. Onset of\ndestructive winds Sunday morning. Damaging winds will continue into\nat least Sunday night, possibly longer if conditions 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...Typhoon Champi (29W) continues to move quickly\ntoward the Marianas. The exact path of 29W remains subject to\nchange. However, guidance supports a passage through Guam coastal\nwaters, with damaging winds moving in late tonight and lasting\ninto at least Sunday night. Champi is expected to strengthen\nfurther today as it approaches, then move through the region as a\ntyphoon Sunday morning. Seas will quickly rise, with significant\nsea heights reaching as high as 35 feet during closest passage of\nChampi. Dangerous sea conditions may continue into Monday.",
  "instruction": "Prepare for the passage of a\ntyphoon Sunday morning. Secure all vessels. Conditions are expected\nto be catastrophic for small craft, and extremely dangerous for any\nvessels of larger size. As Tropical Storm Champi approaches, stay in\nsafe harbor.",
  "url": "https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.f99702882a0d777b34053b53227abd132c15cfbd.001.1",
  "source": "nws",
  "sourceName": "NOAA NWS"
}

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