Severe · Flash Flood WarningThis alert has expired. It is kept for reference.

Flash Flood Warning issued October 18 at 5:29AM ChST until October 18

Affecting Guam, GU

In effect until: Oct 17, 2026, 9:30 PM

Guam, GU

Likely impact in Guam, GU; effects through 9:30 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.

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FFWGUM

The National Weather Service in Tiyan has extended the

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

* Until 730 AM ChST.

* At 529 AM ChST, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2.5 and 5 inches of rain
have fallen. Flash flooding is ongoing or expected to begin
shortly.

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...
Guam

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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™

Flash Flood Warning issued October 18 at 5:29AM ChST until October 18

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