Flash Flood Warning Issued for Guam as Heavy Thunderstorms Move Through Region
The National Weather Service has issued an immediate Flash Flood Warning for Guam, with rainfall rates up to 3 inches per hour expected to cause significant flooding.
Alert Details
The National Weather Service in Tiyan GU has issued a Flash Flood Warning for the island of Guam. The alert was issued at 7:50 AM ChST on March 2, 2026, following radar indications of heavy thunderstorms producing intense rainfall across the region.
Affected Areas
The warning covers the entire island of Guam. Specific locations expected to experience flash flooding include:
- Dededo, Tamuning, Yigo, and Mangilao
- Chalan Pago-Ordot, Barrigada, Yona, and Hagatna Heights
- Andersen AFB and Talofofo
- Mongmong-Toto-Maite, Sinajana, and Inarajan
- Asan, Merizo, Piti, Santa Rita, and Umatac
What You Should Do
Residents and travelers are urged to follow the safety mantra: “Turn around, don’t drown.” Do not attempt to drive through flooded roads, as most flood-related deaths occur in vehicles. Avoid low-lying areas, small creeks, and streams where water levels can rise rapidly.
Expected Conditions
Doppler radar indicates that between 1 and 3 inches of rain have already fallen. Meteorologists expect rainfall rates of 1 to 3 inches per hour as thunderstorms continue. Additional rainfall amounts of 2 to 4 inches are possible in the warned area. These conditions are likely to cause flash flooding of urban areas, streets, and poor drainage locations.
Timeline
The Flash Flood Warning is effective immediately as of 7:50 AM ChST and is currently scheduled to expire at 9:15 AM ChST on March 2, 2026.
Source: NOAA Official Notice