

306 

WWUS20 KWNS 251808

SEL0

SPC WW 251808

INZ000-MIZ000-OHZ000-PAZ000-LEZ000-LHZ000-260200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 510

NWS STORM PREDICTION CENTER NORMAN OK

210 PM EDT THU JUN 25 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHEAST INDIANA

       SOUTHERN MICHIGAN

       NORTHERN INTO CENTRAL OHIO

       FAR NORTHWEST PENNSYLVANIA

       LAKE ERIE

       LAKE HURON



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 210 PM UNTIL

1000 PM EDT.



HAIL TO 2 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 105

STATUTE MILES NORTH AND SOUTH OF A LINE FROM KALAMAZOO MICHIGAN

TO 20 MILES EAST SOUTHEAST OF YOUNGSTOWN OHIO.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU0).



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 508...WW 509...



DISCUSSION...SEVERAL CLUSTERS/AREAS OF SEVERE THUNDERSTORMS EXPECTED

TO EVOLVE ACROSS WW THROUGH THIS EVENING WITHIN LARGE RESERVOIR OF

MODERATE TO STRONG INSTABILITY AND MODEST DEEP LAYER SHEAR.

DAMAGING WINDS AND LARGE HAIL WILL BE COMMON WITH THE MORE INTENSE

CORES AS ACTIVITY MOVE ESEWD THROUGH THE EVENING.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 28020.





...EVANS

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