Heavy Rains Cause Flooding; Practice Extreme Caution

Heavy Rains Cause Flooding; Practice Extreme Caution

The National Weather Service (NWS), Guam Weather Forecast Office advise the circulation expected to pass well northeast of Saipan will continue to bring heavy rains across the Marianas through Monday morning.


NWS advised 2-3 inches of rain has already fallen over parts of central and northern Guam. The following advisories are in effect:


An urban and small stream flood advisory is in effect for Guam until 12:45 p.m., meaning river or stream flows are elevated, or ponding of water in urban or low-lying areas is occurring or imminent. Heavy showers and thunderstorms will drop an additional inch or more of rain through 12:45 p.m., resulting in flooding of roads and low-lying areas.


flash flood watch remains in effect for Guam, Rota, Tinian, and Saipan through Monday afternoon, meaning conditions may develop that lead to flash flooding. Heavy rain is expected from the developing tropical disturbance. Rainfall of 4 to 8 inches is possible through Monday morning. Dangerous flash flooding is possible.


Flooding has been reported in the following areas:

·      Tumon

·      Rt. 1 southbound, near the Micronesia Mall

·      Hamburger Rd., Harmon

·      Polaris, northbound lane

·      Umatac church area

·      Merizo, Barcinas area

Although the roadways remain passable for now, out of an abundance of caution, motorists are advised to avoid flooded areas by seeking alternate routes.


Residents and visitors are advised to take precautionary actions:

  • Turn Around, Don’t Drown. Immediately move to higher ground if flash flooding occurs. Water levels can rise rapidly and sweep people away. 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
  • Stay away from storm drains, culverts, creeks, and streams. 
  • If floodwaters rise around your car but the water is not moving, abandon the car and move to higher ground. If the water is moving, do not leave the car.
  • Avoid camping, parking, or hiking along streams, rivers, and creeks while the advisories are in place. These areas can flood quickly and with little warning.
  • Visit https://www.ready.gov/floods to learn more.


GHS/OCD remind residents and visitors to practice extreme caution while traveling in rainy conditions, driving below the speed limit and allowing enough braking distance between vehicles. Avoid floodwaters and use alternate routes if flooding is encountered. 

To report impassable roads, contact GHS/OCD at (671) 475-9600. 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