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WWUS20 KWNS 282219

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SPC WW 282219

ILZ000-INZ000-KYZ000-MOZ000-290300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 199

NWS STORM PREDICTION CENTER NORMAN OK

515 PM CDT SAT APR 28 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHERN ILLINOIS

       SOUTHWEST INDIANA

       NORTHERN KENTUCKY

       EASTERN MISSOURI



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 515 PM UNTIL

1000 PM CDT.



TORNADOES...HAIL TO 3 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 30 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 30 MILES NORTHWEST OF

FARMINGTON MISSOURI TO 70 MILES EAST OF EVANSVILLE INDIANA.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU9).



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...CONTINUE...WW 197...WW 198...



DISCUSSION...SUPERCELLS EXPECTED TO CONTINUE FORMING ALONG AND N OF

NEARLY STNRY W-E FRONT FROM E CNTRL MO INTO SRN IL.  50 KT WLY DEEP

SHEAR...PRESENCE OF WEAK SFC WAVE/SLIGHTLY ENHANCED LOW LVL FLOW

NEAR STL...AND RELATIVELY SMALL TEMP-DEW POINT SPREADS SUGGEST

POTENTIAL FOR LOW LVL MESOCYLONES/ISOLD TORNADOES AS STORMS INTERACT

WITH FRONT AND/OR MORE SLOWLY-MOVING OUTFLOW BOUNDARIES FROM

EXISTING STORMS.  OTHERWISE...VERY LARGE HAIL AND AREAS OF DMGG

OUTFLOW WINDS EXPECTED THROUGH MID EVE EWD INTO SW IND/N CNTRL KY.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 28030.





...CORFIDI

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