Severe Thunderstorm Warning in Effect; Heavy Winds Expected for Guam Community Advised to Seek Shelter


Severe Thunderstorm Warning in Effect; Heavy Winds Expected for Guam Community Advised to Seek Shelter

The National Weather Service (NWS) Guam Weather Forecast Office have the following advisories in effect:

severe thunderstorm warning is in effect for Guam until 9:30 p.m. Around 8:30 p.m., a severe thunderstorm was located 23 miles southeast of Mangilao, Guam and is moving west at nearly 45 mph.

Wind gusts up to 60 mph, mainly south of Talofofo, are expected. Gusts in excess of 40 mph are possible as far north as Yona and Santa Rosa. Locations impacted include, but are not limited to Yona, Talofofo, Inarajan, Merizo, Santa Rita, and Umatac. Localized wind damage and possible uprooted trees are expected

The community is advised to seek shelter immediately inside a sturdy structure and stay away from windows. Damaging winds and frequent cloud to ground lightning is occurring with this storm. If lightning is seen or thunder is heard, seek shelter indoors. Brief, torrential rainfall is occurring with this storm and may lead to brief flooding. Do not drive through flooded roadways.

special marine warning is issued for Guam coastal waters until 9:30 p.m. A severe thunderstorm capable of producing waterspouts is expected. Waterspouts can easily overturn boats and create locally hazardous seas. Boats could suffer significant structural damage in high winds. Small craft could capsize in suddenly higher waves. Wind gusts in excess of 50 knots, heavy downpours reducing visibility and frequent lightning are expected.

Boaters are advised to move to safe harbor immediately as gusty winds and high waves are expected. Frequent lightning is likely with this storm. If caught on the open water, stay below deck if possible and keep away from ungrounded metal objects.

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

Visit the following links for the latest advisory information:

·  NWS Website:

·  NWS Facebook:

·  GHS/OCD Website:

·  GHS/OCD Facebook:


For more information, contact GHS/OCD Public Information Officer Jenna Blas at (671) 489-2540 or via email at



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June 2018 is Typhoon Preparedness Month