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545 

WWUS20 KWNS 262059

SEL0

SPC WW 262059

DCZ000-DEZ000-MDZ000-NJZ000-PAZ000-VAZ000-CWZ000-270300-



URGENT - IMMEDIATE BROADCAST REQUESTED

Severe Thunderstorm Watch Number 390

NWS Storm Prediction Center Norman OK

500 PM EDT Wed Sep 26 2018



The NWS Storm Prediction Center has issued a



* Severe Thunderstorm Watch for portions of

  District Of Columbia

  Northern Delaware

  Maryland

  Western New Jersey

  Southeastern Pennsylvania

  Northern Virginia

  Coastal Waters



* Effective this Wednesday afternoon and evening from 500 PM

  until 1100 PM EDT.



* Primary threats include...

  Scattered damaging wind gusts to 70 mph possible



SUMMARY...Scattered thunderstorms have formed just east of the

higher terrain and will likely persist for several hours while

spreading generally eastward.  The storm environment supports storm

clusters capable of producing isolated damaging winds.



The severe thunderstorm watch area is approximately along and 60

statute miles east and west of a line from 20 miles north of

Allentown PA to 30 miles south of Washington DC. 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.



&&



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

27030.



...Thompson

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