

000 

WWUS20 KWNS 202305

SEL6

SPC WW 202305

ARZ000-ILZ000-KYZ000-MOZ000-TNZ000-210600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 26

NWS STORM PREDICTION CENTER NORMAN OK

505 PM CST TUE FEB 20 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHEAST ARKANSAS

       EXTREME SOUTHERN ILLINOIS

       WESTERN KENTUCKY

       SOUTHEAST MISSOURI

       WESTERN TENNESSEE



EFFECTIVE THIS TUESDAY AFTERNOON FROM 505 PM UNTIL MIDNIGHT CST.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 15 MILES WEST

SOUTHWEST OF WALNUT RIDGE ARKANSAS TO 20 MILES SOUTH SOUTHEAST OF

CLARKSVILLE TENNESSEE.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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.



DISCUSSION...SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP THIS

EVENING ACROSS PARTS OF EASTERN AR/SOUTHEAST MO...SPREADING ACROSS

THE WATCH AREA.  DESPITE RATHER WEAK CAPE VALUES...COLD TEMPERATURES

ALOFT AND STRONG VERTICAL SHEAR PROFILES SUGGEST THE THREAT OF

SUPERCELLS CAPABLE OF LARGE HAIL AND DAMAGING WINDS.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM

MOTION VECTOR 26035.





...HART

