Severe · Flash Flood WarningActive alert

Flash Flood Warning issued October 17 at 7:28PM ChST until October 18

Affecting Guam, GU

In effect until: Oct 17, 2026, 5:30 PM

Guam, GU

Likely impact in Guam, GU; effects through 5:30 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.

See it on the live map View official source

Read the original bulletin (official text)

FFWGUM

The National Weather Service in Tiyan has issued a

* Flash Flood Warning for...
Guam...

* Until 330 AM ChST Sunday.

* At 728 PM ChST, Doppler radar indicated heavy rain across the
warned area. Between 1 and 2 inches of rain have fallen and
torrential rain will continue through the night. Flash flooding is
ongoing or expected to begin shortly.

HAZARD...Flash flooding caused by heavy rain.

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™

Flash Flood Warning issued October 17 at 7:28PM ChST until October 18

Get the next alert for your area before it matters.

Get alerts in your language