

098 

WWUS20 KWNS 180152

SEL1

SPC WW 180152

MDZ000-OHZ000-PAZ000-WVZ000-180500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 451

NWS STORM PREDICTION CENTER NORMAN OK

955 PM EDT WED JUN 17 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       THE WESTERN MARYLAND PANHANDLE

       SOUTHEAST OHIO

       SOUTHWEST PENNSYLVANIA

       NORTHERN WEST VIRGINIA AND THE EASTERN WEST VIRGINIA

PANHANDLE



EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 955 PM

UNTIL 100 AM 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 60

STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES NORTH OF

WHEELING WEST VIRGINIA TO 55 MILES SOUTH SOUTHWEST OF MORGANTOWN

WEST VIRGINIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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 440...WW 441...WW

443...WW 445...WW 444...WW 446...WW 447...WW 448...WW 449...WW

450...



DISCUSSION...LARGE HAIL/DAMAGING WIND THREAT WILL PERSIST FOR A FEW

MORE HOURS GIVEN A FEED OF MOIST/UNSTABLE AIR FROM THE SW AND LIFT

WITH WARM ADVECTION AND A SHORTWAVE TROUGH BRUSHING THIS AREA TO THE

NORTH.



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 450. MEAN STORM

MOTION VECTOR 30020.





...THOMPSON

