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WWUS20 KWNS 021554

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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 57

NWS STORM PREDICTION CENTER NORMAN OK

955 AM CST FRI MAR 2 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       CENTRAL AND SOUTHERN ILLINOIS

       CENTRAL AND SOUTHERN INDIANA

       WESTERN KENTUCKY

       SOUTHEAST MISSOURI



EFFECTIVE THIS FRIDAY MORNING AND EVENING FROM 955 AM UNTIL 600

PM CST.



...THIS IS A PARTICULARLY DANGEROUS SITUATION...



DESTRUCTIVE TORNADOES...LARGE HAIL TO 2.5 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 90 STATUTE

MILES EAST AND WEST OF A LINE FROM 50 MILES SOUTH OF CAPE

GIRARDEAU MISSOURI TO 25 MILES NORTH OF DANVILLE ILLINOIS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU7).



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 55...WW 56...



DISCUSSION...A VOLATILE ENVIRONMENT IS DEVELOPING TODAY ACROSS

NWD-EXPANDING WARM SECTOR...FEATURING MLCAPE VALUES OF 1000-2500

J/KG...DEEP-LAYER SHEAR OF 50-60 KT AND EFFECTIVE SRH OF 300-600

M2/S2.  TSTMS DEVELOPING ALONG AND AHEAD OF COLD FRONT OVER SERN

MO/W-CNTRL IL ARE EXPECTED TO EVOLVE INTO INTENSE SUPERCELLS CAPABLE

OF LONG-TRACKED...SIGNIFICANT TORNADOES.  LARGE HAIL AND DAMAGING

WINDS ARE ALSO LIKELY.



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

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

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

500. MEAN STORM MOTION VECTOR 25045.





...MEAD

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