Flash Flood Warning issued October 18 at 3:23AM ChST until October 18 at 5:30AM ChST by NWS Tiyan GU
Official severe-weather alerts, warning areas, and disaster updates.
expired · active · official-source
FFWGUM The National Weather Service in Tiyan has extended the * Flash Flood Warning for... Guam... * Until 530 AM ChST. * At 323 AM ChST, Doppler radar indicated thunderstorms producing heavy rain across the warned area with the inner eyewall of Champi approaching southern Guam. Between 2 and 4 inches of rain have fallen. Flash flooding is ongoing or expected to begin shortly and will last through Sunday morning. HAZARD...Flash flooding caused by thunderstorms. SOURCE...Radar indicated. IMPACT...Flash flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other poor drainage and low-lying areas. * Some locations that will experience flash flooding include... Dededo, Tamuning, Yigo, Mangilao, Chalan Pago-Ordot, Barrigada, Yona, Hagatna Heights, Andersen AFB, Talofofo, Mongmong-Toto-Maite, Sinajana, Inarajan, Asan, Merizo, Piti, Santa Rita and Umatac. Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be especially cautious at night when it is harder to recognize the dangers of flooding.
- Event time
- Source last updated
- Current version retrieved
- Provider
- NWS — active weather alerts (Storm)
- Location
- GU, US
- Severity
- Severe
- area
- Guam, GU
- event
- Flash Flood Warning
- onset
- 2026-10-18T03:23:00+10:00
- states
- ["GU"]
- urgency
- Immediate
- certainty
- Likely
- effective
- 2026-10-18T03:23:00+10:00
- message id
- urn:oid:2.49.0.1.840.0.cd2b16d8066810fabc926b9874f3602c4569d069.001.1
- references
- ["urn:oid:2.49.0.1.840.0.186b246c6f9ab08c17bb9c37c0282eaa81a8a198.001.1","urn:oid:2.49.0.1.840.0.30438307a09b9d065860127f9a4633169499f03b.001.1"]
- instruction
- Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be especially cautious at night when it is harder to recognize the dangers of flooding.
- message type
- Update
- freshness minutes
- 60
Source use policy · US government work (17 U.S.C. 105)
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Update history (3 recent revisions)
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