Flash Flood Warning Extended


Flash Flood Warning Extended

The National Weather Service (NWS) Guam Weather Forecast Office extended the flash flood warning for Guam until 8:45 p.m. A Flash Flood Warning means that flooding is imminent or occurring within the warned area. This warning may need to be extended beyond 8:45 p.m. if heavy rain redevelops.

NWS advised heavy rain is no longer falling. Rain was falling at a rate of three to five inches per hour earlier this afternoon. Flash flooding is expected to continue for the next couple of hours as rivers, streams and the waters in flooded areas slowly subside.

Significant and life-threatening flooding is still occurring in drainages, streams, rivers, roads, properties, and other low-lying areas. There are multiple public impassable roads, as well as possible rock and mudslides in steep terrain.

Some locations that will experience continued flooding include, but are not limited to Agat, Mangilao, Chalan Pago-Ordot, Barrigada, Yona, Agana Heights, Talofofo, Mongmong-Toto-Maite, Sinajana, Inarajan, Asan, Merizo, Piti, Santa Rita, and Umatac.

An urban and small stream flood advisory remains in effect for Guam until 7:15 p.m. A Flood Advisory means river or stream flows are elevated, or ponding of water in urban or other areas is occurring or is imminent. Heavy rain due to showers and thunderstorms will cause urban and small stream flooding in the advisory area. Up to one inch of rain has already fallen in some locations. Additional rainfall of two to four inches is possible over the area, resulting in minor flooding.

Residents and visitors are advised to take the following precautionary actions:

  • Stay away from streams, rivers, drainage ditches, and culverts, even if they are currently dry;
  • Do not cross fast flowing water in your vehicle, or on foot. Turn around, don’t drown;
  • If driving, be alert for low visibilities and slippery roads in heavy rain;
  • Slow down where water is ponding on the road;
  • Avoid walking or driving through flood waters. Just 6 inches of moving water can knock you down, and 2 feet of water can sweep your vehicle away;
  • Avoid camping, parking, or hiking along streams, rivers, and creeks during heavy rainfall. These areas can flood quickly and with little warning;
  • Visit https://www.ready.gov/floods to learn more.

The Offices of Guam Homeland Security and Civil Defense (GHS/OCD) advise residents and visitors to practice extreme caution while traveling in rainy conditions, driving below the speed limit and allowing enough braking distance between vehicles. 

Visit the following links for the latest advisory information:

For more information, contact GHS/OCD Public Information Officer Jenna G. Blas at (671) 489-2540 or via email at jenna.g.blas@ghs.guam.gov.



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June 2018 is Typhoon Preparedness Month