Flood Advisory — Guam County, gu
Minor flooding is expected — not severe enough for a warning, but potentially inconvenient or hazardous for travel.
Current Status
🌊 Active: Flood Advisory
Flood Advisory issued August 6 at 10:38AM ChST until August 6 at 12:30PM ChST by NWS Tiyan GU
* WHAT...Urban area and small stream flooding caused by excessive rainfall is expected. * WHERE...Guam... * WHEN...Until 1230 PM ChST. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Ponding of water in urban or other areas is occurring or is imminent. * ADDITIONAL DETAILS... - At 1036 AM ChST, Doppler radar indicated heavy rain due to thunderstorms. This will cause urban and small stream flooding. - Heavy rainfall from training showers and thunderstorms will lead to minor flooding in low-lying and poor drainage areas. - 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
Effective August 5, 2026 at 8:38 PM ET · Expires August 5, 2026 at 10:30 PM ET
Event Details
Event Type
Flood Advisory
Severity
minor
Issued By
NWS Tiyan GU
Expires
August 5, 2026 at 10:30 PM ET
Last Checked
1 minute ago
What To Do
📋 Official NWS Guidance
Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles.
Get Flood Advisory Alerts for Guam County
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Frequently Asked Questions
What does a Flood Advisory mean for Guam County, gu?
Minor flooding is expected — not severe enough for a warning, but potentially inconvenient or hazardous for travel.
Is this Flood Advisory currently active?
Yes — this alert is active as of our last check (1 minute ago). It's set to expire August 5, 2026 at 10:30 PM ET.
How do I get notified about Flood Advisory alerts for Guam County?
Download StormCast free on Google Play and set Guam County, gu as one of your monitored locations. StormCast checks the NWS feed continuously and pushes alerts like this directly to your phone — even with the screen off.