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WWUS20 KWNS 240240

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SPC WW 240240

INZ000-OHZ000-PAZ000-LEZ000-240900-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 402

NWS STORM PREDICTION CENTER NORMAN OK

1040 PM EDT WED JUN 23 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EAST CENTRAL INDIANA

       NORTHERN AND CENTRAL OHIO

       NORTHWEST PENNSYLVANIA

       LAKE ERIE



EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 1040 PM

UNTIL 500 AM EDT.



HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 85

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 65 MILES WEST

SOUTHWEST OF FINDLAY OHIO TO 30 MILES NORTHEAST OF YOUNGSTOWN

OHIO.  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 397...WW 399...WW

400...WW 401...



DISCUSSION...FAST-MOVING BOW ECHO OVER NORTHERN INDIANA WILL RACE

EASTWARD DURING THE NEXT FEW HOURS.  WIDESPREAD DAMAGING WINDS WILL

REMAIN POSSIBLE...ALTHOUGH RECENT RADAR AND LIGHTNING TRENDS SUGGEST

THE SYSTEM HAS WEAKENED SLIGHTLY.  AMPLE MOISTURE AND STRONG

INSTABILITY AHEAD OF THE STORMS MAY RE-INTENSIFY THE BOW OVER OH.



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

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 75 KNOTS.

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

VECTOR 27040.





...HART

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