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706 

WWUS20 KWNS 292029

SEL6

SPC WW 292029

MDZ000-VAZ000-WVZ000-300200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 316

NWS STORM PREDICTION CENTER NORMAN OK

430 PM EDT TUE MAY 29 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN MARYLAND

       NORTHERN AND CENTRAL VIRGINIA

       EXTREME EASTERN WEST VIRGINIA



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 430 PM UNTIL

1000 PM EDT.



HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 45

STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES EAST OF

HAGERSTOWN MARYLAND TO 15 MILES SOUTH SOUTHEAST OF STAUNTON

VIRGINIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 313...WW 314...WW 315...



DISCUSSION...THUNDERSTORMS HAVE SHOWN SIGNS OF INCREASING OVER ERN

WV ALONG THE SRN EDGE OF A STRONGER SHORT WAVE TROUGH MOVING TOWARD

THE LOWER GREAT LAKES.  AIR MASS HAS BECOME QUITE UNSTABLE WITH

MLCAPE NEAR 2500 J/KG.  THE AREA IS ALSO ALONG THE SRN EDGE OF

STRONGER FLOW ALOFT WITH SUFFICIENT SHEAR TO SUPPORT ORGANIZED

MULTICELL STORMS.  STRONGER ACTIVITY WILL BE CAPABLE OF PRODUCING

DAMAGING WIND GUSTS AND OCCASIONAL LARGE 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 550. MEAN STORM

MOTION VECTOR 24025.





...WEISS

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