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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 164

NWS STORM PREDICTION CENTER NORMAN OK

220 AM EDT WED APR 20 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN OHIO

       WESTERN PENNSYLVANIA

       NORTHERN WEST VIRGINIA



EFFECTIVE THIS WEDNESDAY MORNING FROM 220 AM UNTIL 900 AM EDT.



HAIL TO 0.5 INCH 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 75

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

FRANKLIN PENNSYLVANIA TO 50 MILES SOUTHEAST OF ZANESVILLE OHIO.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU4).



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 157...WW 159...WW

160...WW 161...WW 162...WW 163...



DISCUSSION...NRN PART OF OH QLCS WILL CONTINUE E INTO GRADUALLY MORE

STABLE AIR OVER FAR ERN OH/WRN PA.  70 KT SSWLY LLJ AND FORCING FOR

ASCENT DOWNSTREAM FROM OH VLY UPR IMPULSE SUGGEST POTENTIAL FOR

SPORADIC INSTANCES OF DMGG WIND DESPITE MARGINAL LOW-LVL BUOYANCY.



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

TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM

MOTION VECTOR 24045.





...CORFIDI

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