

882 

WWUS20 KWNS 251614

SEL0

SPC WW 251614

ILZ000-INZ000-KYZ000-MOZ000-260200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 370

NWS STORM PREDICTION CENTER NORMAN OK

1110 AM CDT WED MAY 25 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHERN ILLINOIS

       SOUTHERN INDIANA

       WESTERN AND CENTRAL KENTUCKY

       EASTERN MISSOURI



EFFECTIVE THIS WEDNESDAY MORNING AND EVENING FROM 1110 AM UNTIL

900 PM CDT.



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



DESTRUCTIVE TORNADOES...LARGE 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 75 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 45 MILES WEST OF FARMINGTON

MISSOURI TO 40 MILES SOUTH SOUTHEAST OF LOUISVILLE KENTUCKY.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU0).



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 367...WW 368...WW 369...



DISCUSSION...AN OUTBREAK OF TORNADOES --SOME POTENTIALLY STRONG TO

VIOLENT AND LONG-TRACKED-- IS EXPECTED ACROSS THE WATCH AREA TODAY

IN ASSOCIATION WITH MULTIPLE WAVES OF SUPERCELLS.  THE COMBINATION

OF A VERY MOIST BOUNDARY LAYER AND DAYTIME HEATING WILL CONTRIBUTE

TO A BROAD...MODERATELY TO STRONGLY UNSTABLE WARM SECTOR WITH MLCAPE

VALUES OF 1500-3500 J/KG.  THIS INSTABILITY WILL COINCIDE WITH 50-60

KT OF DEEP SWLY SHEAR AND EFFECTIVE SRH OF 300-500 M2/S2...RESULTING

IN A VOLATILE ENVIRONMENT QUITE FAVORABLE FOR LONG-LIVED SUPERCELLS.



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

600. MEAN STORM MOTION VECTOR 24035.





...MEAD

