

687 

WWUS20 KWNS 252221

SEL5

SPC WW 252221

MDZ000-PAZ000-VAZ000-WVZ000-260600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 365

NWS STORM PREDICTION CENTER NORMAN OK

620 PM EDT TUE JUN 25 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  WESTERN AND CENTRAL MARYLAND

  CENTRAL PENNSYLVANIA

  NORTHERN VIRGINIA

  THE EASTERN WEST VIRGINIA PANHANDLE



* EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 620 PM

  UNTIL 200 AM EDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  A FEW LARGE HAIL EVENTS TO 1 INCH IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75

STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES EAST

NORTHEAST OF BRADFORD PENNSYLVANIA TO 30 MILES SOUTH SOUTHWEST OF

MARTINSBURG WEST VIRGINIA.  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 361...WW 362...WW

363...WW 364...



DISCUSSION...LOOSELY-ORGANIZED SQLN IN WRN PA/SE OH EXPECTED TO

MOVE/DEVELOP GENERALLY ESE THROUGH MID TO LATE EVE...INTO CORRIDOR

OF STEEP LOW-LVL LAPSE RATES ON SRN FRINGE OF MCV THAT CROSSED NRN

PA EARLIER TODAY. AREA VWPS SHOW A FAIRLY DEEP LAYER OF 30-40 KT

UNIDIRECTIONAL MID-LVL WLY FLOW THAT SHOULD FOSTER DOWNSHEAR

DEVELOPMENT/FORWARD-PROPAGATING LINE SEGMENTS WITH A RISK FOR

LOCALLY DMGG WIND.



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 29025.





...CORFIDI

