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OHZ000-PAZ000-LEZ000-100400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 758

NWS STORM PREDICTION CENTER NORMAN OK

655 PM EDT TUE AUG 9 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN OHIO

       NORTHWEST PENNSYLVANIA

       LAKE ERIE



EFFECTIVE THIS TUESDAY NIGHT FROM 655 PM UNTIL MIDNIGHT EDT.



HAIL TO 1 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 60

STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES WEST

NORTHWEST OF ERIE PENNSYLVANIA TO 50 MILES SOUTH SOUTHEAST OF

MANSFIELD OHIO.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 753...WW 754...WW

755...WW 756...WW 757...



DISCUSSION...SCTD TSTMS/SHORT LINE SEGMENTS EXPECTED TO MOVE E INTO

WW AREA LATER THIS EVE AHEAD OF LOW AMPLITUDE DISTURBANCE IN WNWLY

MID/UPR LVL FLOW.  STRENGTH OF WIND FIELD...PRESENCE OF EXISTING

SUSTAINED STORMS...AND NARROW AXIS OF SFC-BASED INSTABILITY

EXTENDING NEWD INTO NE OH/FAR NW PA SUGGEST POSSIBILITY OF ISOLD

WIND GUSTS AND POSSIBLY MARGINALLY SVR HAIL.



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

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

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

VECTOR 29030.





...CORFIDI

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