Alert USA
weather NWS minor Guam, GU October 19, 2026 at 5:06 AM

Flood Advisory

* WHAT...Urban area and small stream flooding caused by excessive rainfall is expected.

* WHERE...Guam...

* WHEN...Until 600 PM ChST.

* IMPACTS...Minor flooding in low-lying and poor drainage areas. Water over roadways.

* ADDITIONAL DETAILS... - At 304 PM ChST, Doppler radar indicated heavy rain due to heavy showers and thunderstorms approaching from the south. This will cause urban and small stream flooding, starting with southern Guam. - Some locations that will experience 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. - http://www.weather.gov/safety/flood

Flooding in Guam, GU can cut off roads with little warning, damage homes near low-lying areas, and disrupt power and water service. Even a few inches of moving water can carry away a vehicle.

This report is based on information from NWS, monitored by Alert USA's verified emergency feed.

Alert USA anticipates a high chance of travel disruptions, elevated property risk in low-lying areas, and possible power outages while the event is active.

Recommended steps: avoid flooded roads — turn around, don't drown; move to higher ground if you are in a low-lying area; charge phones and prepare for power loss; check on family and neighbors.

Alert USA is tracking this flood event and will update this report as verified information becomes available.

Verified by Alert USA • NWS

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