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WWUS20 KWNS 131708

SEL6

SPC WW 131708

DCZ000-MDZ000-PAZ000-VAZ000-WVZ000-CWZ000-140000-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 436

NWS Storm Prediction Center Norman OK

110 PM EDT Fri Aug 13 2021



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  District Of Columbia

  Maryland

  Southeast Pennsylvania

  Central and Northern Virginia

  Eastern Panhandle of West Virginia

  Coastal Waters



* Effective this Friday afternoon and evening from 110 PM until

  800 PM EDT.



* Primary threats include...

  Scattered damaging wind gusts to 70 mph possible



SUMMARY...Thunderstorms are expected to increase in coverage and

intensity through the afternoon and spread eastward across the watch

area.  While storms will likely be rather disorganized, the

strongest cells will be capable of locally damaging wind gusts.



The severe thunderstorm watch area is approximately along and 55

statute miles east and west of a line from 55 miles northeast of

Harrisburg PA to 55 miles south southwest of Lynchburg VA. For a

complete depiction of the watch see the associated watch outline

update (WOUS64 KWNS WOU6).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



REMEMBER...A Severe Thunderstorm Watch means conditions are

favorable for severe thunderstorms in and close to the watch area.

Persons in these areas should be on the lookout for threatening

weather conditions and listen for later statements and possible

warnings. Severe thunderstorms can and occasionally do produce

tornadoes.



&&



AVIATION...A few severe thunderstorms with hail surface and aloft to

1 inch. Extreme turbulence and surface wind gusts to 60 knots. A few

cumulonimbi with maximum tops to 500. Mean storm motion vector

28020.



...Hart

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