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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 671

NWS STORM PREDICTION CENTER NORMAN OK

605 PM EDT TUE JUL 8 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EAST CENTRAL OHIO

       WESTERN PENNSYLVANIA

       THE NORTHERN WEST VIRGINIA PANHANDLE



EFFECTIVE THIS TUESDAY EVENING FROM 605 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 55

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

FRANKLIN PENNSYLVANIA TO 30 MILES SOUTHWEST OF WHEELING 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 668...WW 669...WW 670...



DISCUSSION...A CLUSTER OF MULTICELL STORMS IN OH WILL LIKELY PERSIST

AND SPREAD INTO WRN PA THIS EVENING...WHERE MODERATE INSTABILITY

REMAINS.  THE VWP FROM CLE SHOWS 40-45 KT FLOW 1-2 KM AGL WHICH WILL

SUPPORT A CONTINUED THREAT FOR DAMAGING WINDS AS THE STORMS DEVELOP

ESEWD THROUGH THE EVENING.  THE STRONGEST UPDRAFTS MAY ALSO PRODUCE

ISOLATED 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 500. MEAN STORM

MOTION VECTOR 28025.





...THOMPSON

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