Flash Flood Watch in Effect through Tuesday; Periods of Heavy Showers Expected Over the Next Few Days


Flash Flood Watch in Effect through Tuesday; Periods of Heavy Showers Expected Over the Next Few Days

The National Weather Service (NWS) Guam Weather Forecast Office has issued a flash flood watch in effect for Guam through Tuesday evening. A flash flood watch means conditions may develop that lead to flash flooding.

A monsoon trough will remain over the Marianas for the next few days, with light to gentle winds expected. This will result in periods of heavy showers through today and through Tuesday due to the monsoon trough. With this, combined with the already saturated ground, flash flooding is very much a possibility. Due to the amount of previous rainfall, additional rainfall could also result in mudslides along steep terrain and cliffs.

Excessive rainfall will cause localized flooding in low-lying and poor drainage areas, and rapidly rising streams and rivers. Take the following preparedness actions:

  • Those living in flood-prone areas should take action; clear drainage areas and unblock clogged storm drains in your area to minimize flooding. 
  • Take action if flood advisories are issued.
  • Do not camp, park, or hike along streams, rivers, and creeks during heavy rainfall. These areas can flood quickly and with little warning.
  • Avoid driving on flooded roads;
  • If driving, be alert for low visibilities and slippery roads in heavy rain;
  • Slow down where water is ponding on the road;
  • Turn Around, Don’t Drown. 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.


The Offices of Guam Homeland Security and Civil Defense (GHS/OCD) remind the community to practice 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