Severe · Flash Flood WarningThis alert has expired. It is kept for reference.
Flash Flood Warning issued October 18 at 3:23AM ChST until October 18
Affecting Guam, GU
In effect until: Oct 17, 2026, 7:30 PM
Guam, GU
Likely impact in Guam, GU; effects through 7:30 PM.
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.
Read the original bulletin (official text)
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.
Free. In your language.
Get the next alert for your area before it matters.
Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™