

000 

WWUS20 KWNS 281658

SEL9

SPC WW 281658

INZ000-KYZ000-OHZ000-PAZ000-WVZ000-LEZ000-290000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 629

NWS STORM PREDICTION CENTER NORMAN OK

1255 PM EDT SAT JUN 28 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       LARGE PART OF SOUTHERN INDIANA

       SMALL PART OF NORTHERN KENTUCKY

       MUCH OF OHIO

       PARTS OF WESTERN PENNSYLVANIA

       PARTS OF NORTHERN WEST VIRGINIA

       LAKE ERIE



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 1255 PM UNTIL

800 PM EDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 85

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 80 MILES SOUTHWEST

OF MUNCIE INDIANA TO 40 MILES NORTH NORTHEAST OF PITTSBURGH

PENNSYLVANIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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 628...



DISCUSSION...THUNDERSTORMS EXPECTED TO INCREASE RAPIDLY IN NUMBER

AND INTENSITY ACROSS THE WATCH AREA AS MDTLY UNSTABLE AIR MASS

BECOMES UNCAPPED. APPROACH OF A VERY STRONG MID LEVEL JET FROM THE W

COUPLED WITH 30-40KT LLJ WILL SUPPORT DEVELOPMENT OF RAPIDLY MOVING

LINES/BOWS. WIND DAMAGE WILL BE PRIMARY THREAT AND POTENTIAL FOR

BOTH SIGNIFICANT AND WIDESPREAD WIND DAMAGE DEVELOPING BY MID/LATE

AFTERNOON.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 24040.





...HALES

