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946 

WWUS20 KWNS 230605

SEL5

SPC WW 230605

ILZ000-INZ000-KYZ000-MOZ000-OHZ000-231000-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 185

NWS STORM PREDICTION CENTER NORMAN OK

205 AM EDT SAT APR 23 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHERN ILLINOIS

       SOUTHERN INDIANA

       WESTERN AND CENTRAL KENTUCKY

       SOUTHEAST MISSOURI

       EXTREME SOUTHWEST OHIO



EFFECTIVE THIS SATURDAY MORNING FROM 205 AM UNTIL 600 AM EDT.



TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 40 MILES NORTHWEST OF POPLAR

BLUFF MISSOURI TO 40 MILES EAST NORTHEAST OF LEXINGTON KENTUCKY.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU5).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 181. WATCH NUMBER 181 WILL NOT BE IN EFFECT AFTER

205 AM EDT. CONTINUE...WW 183...WW 184...



DISCUSSION...LARGE BROKEN CLUSTER OF STRONG/SEVERE STORMS WILL

PERSIST FOR A FEW MORE HOURS BEFORE INSTABILITY WEAKENS.  A FEW

DAMAGING GUSTS AND AN ISOLATED TORNADO OR TWO WILL BE POSSIBLE WITH

STORMS FROM CENTRAL KY INTO SE INDIANA/SW OH ON THE LEADING EDGE OF

THE CONVECTION WHERE LOW-LEVEL SHEAR WILL BE STRONGEST AND THE

ATMOSPHERE HAS YET TO BE OVERTURNED.  FARTHER W...PRIOR CONVECTION

HAS STABILIZED THE BOUNDARY LAYER SOME...BUT A FEED OF MODERATE

INSTABILITY ABOVE THE SURFACE WILL MAINTAIN A THREAT FOR SLIGHTLY

ELEVATED STORMS WITH LARGE HAIL AND ISOLATED DAMAGING GUSTS FROM SE

MO INTO WRN KY/SRN IL.



AVIATION...TORNADOES AND 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 26040.





...THOMPSON

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