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564 

WWUS20 KWNS 232320

SEL6

SPC WW 232320

OHZ000-PAZ000-LEZ000-240700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 526

NWS STORM PREDICTION CENTER NORMAN OK

720 PM EDT FRI JUL 23 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       MUCH OF NORTHERN OHIO

       NORTHWEST PENNSYLVANIA

       LAKE ERIE



EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 720 PM

UNTIL 300 AM 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 NORTH AND SOUTH OF A LINE FROM 10 MILES WEST

SOUTHWEST OF FINDLAY OHIO TO 20 MILES NORTHEAST OF FRANKLIN

PENNSYLVANIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 521...WW 522...WW

523...WW 524...WW 525...



DISCUSSION...QLCS EVOLVING OVER SERN LOWER MI AND SWRN ONTARIO IS

EXPECTED TO MOVE/DEVELOP ESEWD ACROSS LAKE ERIE INTO AREA TONIGHT.

THE COMBINATION OF MODESTLY STRONG DEEP...UNIDIRECTIONAL SHEAR AND A

MODERATELY UNSTABLE AIR MASS SHOULD SUSTAIN MCS FOR THE NEXT SEVERAL

HOURS WITH THE PRIMARY HAZARD BEING DAMAGING WIND GUSTS.



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 29030.





...MEAD

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