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316 

WWUS20 KWNS 302045

SEL0

SPC WW 302045

MDZ000-PAZ000-VAZ000-WVZ000-010200-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 330

NWS Storm Prediction Center Norman OK

445 PM EDT Wed Jun 30 2021



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  Northern Maryland

  South central Pennsylvania

  Extreme northern Virginia

  The eastern West Virginia Panhandle



* Effective this Wednesday afternoon and evening from 445 PM

  until 1000 PM EDT.



* Primary threats include...

  Isolated damaging wind gusts to 70 mph possible



SUMMARY...A couple of storm clusters may persist and spread

east-northeastward through this evening, along an immediately

southeast of an outflow boundary approaching southern Pennsylvania.

The storm environment favors occasional downbursts with wind damage.



The severe thunderstorm watch area is approximately along and 40

statute miles north and south of a line from 30 miles east northeast

of Harrisburg PA to 40 miles south southwest of Altoona PA. For a

complete depiction of the watch see the associated watch outline

update (WOUS64 KWNS WOU0).



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 326...WW 327...WW

328...WW 329...



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

0.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A

few cumulonimbi with maximum tops to 500. Mean storm motion vector

26020.



...Thompson

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