NOAA NWS / Event history

Flood Watch issued October 19 at 3:40AM ChST until October 19 at 4:00AM ChST by NWS Tiyan GU

Flood Watch · Guam; Rota. Severe; possible; urgency: future.

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Bulletin issued: 18 October 2026 at 17:40 UTC
First saved by us: 18 October 2026 at 06:02 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: 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 · Guam; Rota
Certainty / urgency: Possible / Future
Message expiry (not hazard end): 18 October 2026 at 18:45 UTC
Forecast onset / end: 18 October 2026 at 17:40 UTC / 18 October 2026 at 18:00 UTC

Archived official description

The Flood Watch will expire for Guam, Rota. The flooding threat has ended as Typhoon Champi moves away. Therefore, the Flood Watch will expire at 4 AM ChST early this morning.

The saved record

What changed

1 update · 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 1 change

Saved by us
18 October 2026 at 17:47 UTC
Version 2
Source status changed
Title
Before
Flood Watch issued October 18 at 3:59PM ChST until October 19 at 4:00AM ChST by NWS Tiyan GU
After
Flood Watch issued October 19 at 3:40AM ChST until October 19 at 4:00AM ChST by NWS Tiyan GU
Source updated
Before
18 October 2026 at 05:59 UTC
After
18 October 2026 at 17:40 UTC
Effective from
Before
18 October 2026 at 05:59 UTC
After
18 October 2026 at 17:40 UTC
Forecast onset
Before
18 October 2026 at 05:59 UTC
After
18 October 2026 at 17:40 UTC
Message expiry
Before
18 October 2026 at 18:00 UTC
After
18 October 2026 at 18:45 UTC
Message type
Before
Alert
After
Update
Source status
Before
Source alert
After
Source update
Official description
Before
* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...Guam, Rota. * WHEN...Through late tonight. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. Storm drains and ditches may become clogged with debris. Extensive street flooding and flooding of creeks and rivers are possible. * ADDITIONAL DETAILS... - As Super Typhoon Champi (29W) continues to move west, away from the Marianas, outer bands around Champi will produce locally heavy rainfall tonight. Rota could receive 1 to 3 inches, and Guam might get 2 to 4 inches. - http://www.weather.gov/safety/flood
After
The Flood Watch will expire for Guam, Rota. The flooding threat has ended as Typhoon Champi moves away. Therefore, the Flood Watch will expire at 4 AM ChST early this morning.
Official instructions
Before
~~You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.~~
After
Not supplied
External source link
Before
https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.a56cdf023271a7438c881266db8b934ca1078963.001.1
After
https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.2b6e8b062198b9bbe051562c8f478edfab710a7c.001.1
Bulletin issued: 18 October 2026 at 17:40 UTC
View saved version 2
Original saved fields, unchanged. This is our record, not an archived copy of the external webpage.
{ "id": "nws:8d800b9f69cc3eaf4c0fbf28", "authorityId": "urn:oid:2.49.0.1.840.0.2b6e8b062198b9bbe051562c8f478edfab710a7c.001.1", "sender": "w-nws.webmaster@noaa.gov", "references": [ { "identifier": "urn:oid:2.49.0.1.840.0.a56cdf023271a7438c881266db8b934ca1078963.001.1", "sender": "w-nws.webmaster@noaa.gov" } ], "category": "weather", "title": "Flood Watch issued October 19 at 3:40AM ChST until October 19 at 4:00AM ChST by NWS Tiyan GU", "eventType": "Flood Watch", "occurredAt": "2026-10-18T17:40:00.000Z", "issuedAt": "2026-10-18T17:40:00.000Z", "timeBasis": "Bulletin issued", "effectiveAt": "2026-10-18T17:40:00.000Z", "onsetAt": "2026-10-18T17:40:00.000Z", "expiresAt": "2026-10-18T18:45:00.000Z", "forecastEndAt": "2026-10-18T18:00:00.000Z", "severity": "Severe", "urgency": "Future", "certainty": "Possible", "messageType": "Update", "status": "Source update", "place": "Guam; Rota", "coordinates": null, "issuer": "NWS Tiyan GU", "summary": "Flood Watch · Guam; Rota. Severe; possible; urgency: future.", "description": "The Flood Watch will expire for Guam, Rota.\n\nThe flooding threat has ended as Typhoon Champi moves away.\nTherefore, the Flood Watch will expire at 4 AM ChST early this\nmorning.", "instruction": "", "url": "https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.2b6e8b062198b9bbe051562c8f478edfab710a7c.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 · 18 October 2026 at 06:02 UTC

Saved by us

18 October 2026 at 06:02 UTC

Starting point

First saved record

Our first saved version of Flood Watch issued October 18 at 3:59PM ChST until October 19 at 4:00AM ChST by NWS Tiyan GU. We have no earlier saved version to compare.

Bulletin issued: 18 October 2026 at 05:59 UTC

View saved version 1

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

{
  "id": "nws:4c9bcdbba4415ea882ab6a1c",
  "authorityId": "urn:oid:2.49.0.1.840.0.a56cdf023271a7438c881266db8b934ca1078963.001.1",
  "sender": "w-nws.webmaster@noaa.gov",
  "references": [],
  "category": "weather",
  "title": "Flood Watch issued October 18 at 3:59PM ChST until October 19 at 4:00AM ChST by NWS Tiyan GU",
  "eventType": "Flood Watch",
  "occurredAt": "2026-10-18T05:59:00.000Z",
  "issuedAt": "2026-10-18T05:59:00.000Z",
  "timeBasis": "Bulletin issued",
  "effectiveAt": "2026-10-18T05:59:00.000Z",
  "onsetAt": "2026-10-18T05:59:00.000Z",
  "expiresAt": "2026-10-18T18:00:00.000Z",
  "forecastEndAt": "2026-10-18T18:00:00.000Z",
  "severity": "Severe",
  "urgency": "Future",
  "certainty": "Possible",
  "messageType": "Alert",
  "status": "Source alert",
  "place": "Guam; Rota",
  "coordinates": null,
  "issuer": "NWS Tiyan GU",
  "summary": "Flood Watch · Guam; Rota. Severe; possible; urgency: future.",
  "description": "* WHAT...Flooding caused by excessive rainfall continues to be\npossible.\n\n* WHERE...Guam, Rota.\n\n* WHEN...Through late tonight.\n\n* IMPACTS...Excessive runoff may result in flooding of rivers,\ncreeks, streams, and other low-lying and flood-prone locations.\nFlooding may occur in poor drainage and urban areas. Storm drains\nand ditches may become clogged with debris. Extensive street\nflooding and flooding of creeks and rivers are possible.\n\n* ADDITIONAL DETAILS...\n- As Super Typhoon Champi (29W) continues to move west, away from\nthe Marianas, outer bands around Champi will produce locally\nheavy rainfall tonight. Rota could receive 1 to 3 inches, and\nGuam might get 2 to 4 inches.\n- http://www.weather.gov/safety/flood",
  "instruction": "You should monitor later forecasts and be prepared to take action\nshould Flash Flood Warnings be issued.",
  "url": "https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.a56cdf023271a7438c881266db8b934ca1078963.001.1",
  "source": "nws",
  "sourceName": "NOAA NWS"
}

Visit the external source ↗

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

Flood Watch issued October 19 at 3:40AM ChST until October 19 at 4:00AM ChST by NWS Tiyan GU

Archived official description

What changed

Source status changed

First saved record