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006 

WWUS20 KWNS 281711

SEL6

SPC WW 281711

MDZ000-OHZ000-PAZ000-VAZ000-WVZ000-290000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 386

NWS STORM PREDICTION CENTER NORMAN OK

110 PM EDT FRI JUN 28 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  WESTERN MARYLAND

  SOUTHEAST OHIO

  SOUTHWEST AND SOUTH-CENTRAL PENNSYLVANIA

  NORTHERN VIRGINIA

  NORTHERN WEST VIRGINIA



* EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 110 PM UNTIL

  800 PM EDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  SEVERAL LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 105

STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES SOUTH

SOUTHWEST OF ELKINS WEST VIRGINIA TO 15 MILES NORTH NORTHEAST OF

ALTOONA PENNSYLVANIA.  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.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 385...



DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND

INTENSITY ACROSS THE WATCH AREA THIS AFTERNOON AS FORCING FOR ASCENT

IS ENHANCED BY A VORTICITY MAXIMUM PIVOTING AROUND AN UPPER LOW

CENTERED OVER SWRN ONTARIO.  GIVEN THE COMBINATION OF MLCAPE OF

1000-1500 J/KG AND 40-50 KT OF DEEP-LAYER SHEAR...THE SETUP WILL BE

SUPPORTIVE OF SUPERCELLS AND BOWING STRUCTURES CAPABLE OF DAMAGING

WINDS AND SEVERE HAIL.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 28030.





...MEAD

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