Guam Severe Flash Flood Warning | Effective 08/30/2026 00:33

Headline: 
Flash Flood Warning issued August 30 at 5:33PM ChST until August 30 at 6:30PM ChST by NWS Tiyan GU
Event: 
Flash Flood Warning
Urgency: 
Immediate
Effective: 
August 30, 2026 - 12:33am
Expires: 
August 30, 2026 - 1:30am
Description: 
FFWGUM The National Weather Service in Tiyan has issued a * Flash Flood Warning for... Central Guam... * Until 630 PM ChST. * At 533 PM ChST, Doppler radar indicated heavy rain across the warned area. Additional rainfall amounts of 2 to 3 inches are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD...Flash flooding caused by heavy rain. SOURCE...Radar indicated. IMPACT...Flash flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other poor drainage and low-lying areas. * Some locations that will experience flash flooding include... Dededo, Tamuning, Mangilao, Chalan Pago-Ordot, Barrigada, Mongmong-Toto-Maite and Sinajana.
Instruction: 
Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Move to higher ground now. Act quickly to protect your life. Be aware of your surroundings and do not drive on flooded roads.
Area Description: 
Guam, GU
Forcast Office: 
NWS Tiyan GU
Sender: 
w-nws.webmaster@noaa.gov