JIC Release No. 4 - 20W Upgraded to a Tropical Storm; Guam Remains in COR 3

   

JIC Release No. 4 - 20W Upgraded to a Tropical Storm; Guam Remains in COR 3

The National Weather Service (NWS) Weather Forecast Office Guam continues to monitor 20W, which has been upgraded to a tropical storm. Guam remains in Condition of Readiness (COR) 3 at this time. 

A tropical storm warning remains in effect for Guam, Rota, Tinian, and Saipan. A tropical storm warning means tropical storm conditions, including sustained winds of 39 to 74 mph, are expected this evening. 

As of 7 p.m., 20W was located near 13.3 degrees north latitude and 144.1 degrees east longitude, about 45 miles west-southwest of Guam and 165 miles southwest of Saipan. It is moving west-northwest at 16 mph with maximum sustained winds of 40 mph. 20W is forecast to intensify over the next few days, possibly becoming a typhoon west of the Marianas Friday afternoon. 


CPA Passed but Gusty Winds Continue
The Closest Point of Approach (CPA) occurred around 6 p.m. this evening but the community is reminded strong winds are expected to continue overnight, even after the CPA. Although the CPA has passed, Guam can still expect tropical storm force winds of 35 to 45 mph, with gusts to 55 mph in heavier showers, through at least midnight tonight. 

An urban and small stream flood advisory is in effect for poor drainage areas of Guam until 12:15 a.m. Bands of showers forming near Guam will produce heavy rain and will cause urban and small stream flooding. Overflow in poor drainage areas will result in minor flooding. Over two inches of rain have already fallen in some areas of Guam. Additional rainfall of 1 to 3 inches is expected over the area. 


Practice Caution 
Heavy rain is expected to continue through this evening. The community is reminded to take the following precautions:

  • 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. 

  • Do not camp, park, or hike along streams, rivers, and creeks. These areas can flood quickly and with little warning. 

  • If travel is necessary, practice caution while 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 the Joint Information Center at (671) 478-0208/09/10.

Click here to view NWS forecast track - Sept. 23, 7pm

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