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WWUS20 KWNS 271851

SEL2

SPC WW 271851

INZ000-KYZ000-MIZ000-OHZ000-LEZ000-280300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 532

NWS STORM PREDICTION CENTER NORMAN OK

245 PM EDT FRI JUL 27 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       INDIANA

       NORTHERN KENTUCKY

       SOUTHERN LOWER MICHIGAN

       WESTERN AND NORTHERN OHIO

       LAKE ERIE



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 245 PM UNTIL

1100 PM EDT.



HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 75

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 115

STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES NORTHEAST OF

TOLEDO OHIO TO 70 MILES SOUTHEAST OF BLOOMINGTON INDIANA.  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 531...



DISCUSSION...TSTMS EXPECTED TO INCREASE IN COVERAGE AND STRENGTH IN

SEVERAL AREAS OF LOW LVL MESOSCALE ASCENT OVER THE MIDWEST/OH VLY

LATER THIS AFTN THROUGH EARLY TNGT.  STORMS SHOULD CONTINUE TO FORM

INVOF EWD-MOVING SRN LWR MI SFC WAVE...AND ALONG TRAILING COLD FRONT

TO ITS SW. OTHER STORMS MAY FORM/STRENGTHEN INTO THE BOUNDARY LAYER

FROM EXISTING ELEVATED CONVECTION ALONG ERN EDGE OF APPARENT EML NOW

OVER CNTRL IND. COMBINATION OF FAIRLY RICH MOISTURE...AMPLE DEEP

SHEAR...AND LARGE SCALE FORCING FOR ASCENT WITH CONTINUING

AMPLIFICATION OF LARGER SCALE UPR TROUGH SUGGEST POTENTIAL FOR

UPSCALE DEVELOPMENT INTO BOWING SEGMENTS WITH DMGG WIND/SVR HAIL.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 27030.





...CORFIDI

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