Alert USA
weather NWS minor Guam, GU October 17, 2026 at 10:14 PM

Flood Advisory

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

* WHERE...Guam...

* WHEN...Until 1215 PM ChST.

* IMPACTS...Minor flooding in low-lying and poor drainage areas. Water over roadways. Ponding of water in urban or other areas is occurring. Rises in rivers and small streams.

* ADDITIONAL DETAILS... - At 811 AM ChST, Doppler radar and automated rain gauges indicated moderate to occasionally heavy rain due to showers and possible thunderstorms. This is causing urban and small stream flooding. - Additional rainfall amounts of 1 to 3 inches are expected over the area. This additional rain will result in minor flooding continuing. - 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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