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577 

WWUS20 KWNS 111759

SEL5

SPC WW 111759

DCZ000-MDZ000-VAZ000-WVZ000-CWZ000-120100-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 425

NWS Storm Prediction Center Norman OK

200 PM EDT Wed Aug 11 2021



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  District Of Columbia

  Maryland

  Much of central and northern Virginia

  The eastern West Virginia Panhandle

  Coastal Waters



* Effective this Wednesday afternoon and evening from 200 PM

  until 900 PM EDT.



* Primary threats include...

  Scattered damaging wind gusts to 60 mph possible

  Isolated large hail events to 1 inch in diameter possible



SUMMARY...Scattered pulse-severe storms will form through the

afternoon in a broken band east of the Blue Ridge, and storms will

drift eastward through this evening.  The strongest updrafts may

produce marginally severe hail, but the main threat will be

occasional wind damage with downbursts.



The severe thunderstorm watch area is approximately along and 65

statute miles east and west of a line from 40 miles north northwest

of Baltimore MD to 5 miles west of Danville VA. For a complete

depiction of the watch see the associated watch outline update

(WOUS64 KWNS WOU5).



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.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 423...WW 424...



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

1 inch. Extreme turbulence and surface wind gusts to 50 knots. A few

cumulonimbi with maximum tops to 500. Mean storm motion vector

27010.



...Thompson

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