Severe · Flash Flood WarningThis alert has expired. It is kept for reference.
Flash Flood Warning issued September 9 at 4:38PM ChST until September 9
Affecting Guam, GU
In effect until: Sep 9, 2026, 8:00 AM
Guam, GU
Likely impact in Guam, GU; effects through 8:00 AM.
Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be aware of your surroundings and do not drive on flooded roads.
Read the original bulletin (official text)
FFWGUM The National Weather Service in Tiyan has issued a * Flash Flood Warning for... Guam... * Until 600 PM ChST. * At 438 PM ChST, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between 1 and 5 inches of rain have fallen. Additional rainfall amounts of 1 to 2 inches are possible in the warned area. Flash flooding is already occurring. 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.
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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™