

060 

WWUS20 KWNS 192228

SEL2

SPC WW 192228

MDZ000-OHZ000-PAZ000-WVZ000-200300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 482

NWS STORM PREDICTION CENTER NORMAN OK

630 PM EDT FRI JUN 19 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



EFFECTIVE THIS FRIDAY EVENING FROM 630 PM UNTIL 1100 PM EDT.



HAIL TO 2 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 NORTH AND SOUTH OF A LINE FROM 30 MILES NORTH

NORTHWEST OF ZANESVILLE OHIO TO 70 MILES EAST NORTHEAST OF ELKINS

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

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 478...WW 479...WW

480...WW 481...



DISCUSSION...A CLUSTER OF STRONG/SEVERE STORMS APPROACHING E CENTRAL

OH WILL LIKELY PERSIST THROUGH THE EVENING WHILE MOVING ESEWD ALONG

A PRONOUNCED INSTABILITY GRADIENT.  A FEED OF MODERATE-STRONG

INSTABILITY FROM THE SW AND EFFECTIVE BULK SHEAR OF 40-50 KT WILL

SUPPORT BOTH EMBEDDED SUPERCELL AND BOWING STRUCTURES CAPABLE OF

PRODUCING DAMAGING WINDS AND LARGE HAIL.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

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

MOTION VECTOR 29035.





...THOMPSON

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