Flash Flood Warning Issued for Guam Until 6 PM ChST
If you are in immediate danger, call emergency services now.
For real-time, official alerts and instructions for your exact location, check weather.gov (US), weather.gc.ca (Canada), the Met Office (UK), or the Bureau of Meteorology (Australia) as applicable. This article is a data summary, not a substitute for the issuing agency's live warning.
Areazine synthesizes this NWS weather alert directly from NOAA's official public data feed. See our methodology for full source attribution and refresh cadence.
NWS Tiyan GU has issued a Flash Flood Warning for Guam effective until 6:00 PM ChST on September 9 due to thunderstorms producing heavy rain and ongoing flash flooding.
Read this weather record in 30 seconds
- Record type
- Flash Flood Warning
- Affected area
- Guam
- Issued
- September 9, 2026
- Issuing authority
- NWS Tiyan GU
Flood notices turn on location and timing. Treat the named area as this record's scope; do not assume nearby counties, parishes, or waterways were included.
Record status: publication date is recent, but current status is not stored on this page. Check the issuing agency's live warning service before acting because warnings can be updated, narrowed, or cancelled.
Alert Details
Flash Flood Warning issued by NWS Tiyan GU. Effective from September 9 at 4:38 PM ChST until September 9 at 6:00 PM ChST. Severity: Severe. Urgency: Immediate. Certainty: Likely.
Affected Areas
Guam, including 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.
What You Should Do
Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be aware of your surroundings and do not drive on flooded roads.
Expected Conditions
Doppler radar indicated thunderstorms producing heavy rain. Between 1 and 5 inches of rain have fallen with additional rainfall amounts of 1 to 2 inches possible. Flash flooding is already occurring.
Timeline
Alert effective September 9 at 4:38 PM ChST. Expires and ends September 9 at 6:00 PM ChST.
Original source: NOAA Official Notice ↗
Related Weather Alerts
All Weather Alerts →Nationwide notices with similar length or severity timing 8
Two Areazine-derived peer sets for this NWS weather alert: nearest notices by body length and by same severity near the same agency date. Peers come from other categories so they are not the same-feed Related list above.
Similar body length
Nearest notices by article body length (936 characters here).
Similar severity timing
Same severity (high) notices issued closest in time to September 9, 2026.
Frequently Asked Questions
Common questions about this NWS weather alert.