

000 

WWUS20 KWNS 181833

SEL2

SPC WW 181833

ALZ000-ARZ000-ILZ000-INZ000-KYZ000-MOZ000-MSZ000-TNZ000-190400-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 722

NWS STORM PREDICTION CENTER NORMAN OK

135 PM CDT THU OCT 18 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PART OF NORTHERN ALABAMA

       PARTS OF NORTHEAST ARKANSAS

       PARTS OF SOUTHERN ILLINOIS

       SMALL PART OF SOUTHERN INDIANA

       WESTERN KENTUCKY

       PARTS OF SOUTHEAST MISSOURI

       NORTHERN MISSISSIPPI

       WESTERN AND PARTS OF MIDDLE TENNESSEE



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 135 PM UNTIL

1100 PM CDT.



TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 120 STATUTE

MILES EAST AND WEST OF A LINE FROM 40 MILES SOUTHEAST OF

GREENWOOD MISSISSIPPI TO 45 MILES NORTH NORTHEAST OF EVANSVILLE

INDIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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.



DISCUSSION...BROAD WARM SECTOR ACROSS LOWER MS/TN VALLEY HAS BECOME

MDTLY UNSTABLE AND WEAKLY CAPPED. WITH STRONG DEEP LAYER SHEAR

ACROSS THE WATCH AREA...THUNDERSTORMS EXPECTED TO INCREASE IN NUMBER

AND INTENSITY REMAINDER OF AFTERNOON.  SUPERCELLS INCLUDING

TORNADOES WILL BE LIKELY GIVEN THE STRONG SHEAR IN PLACE.



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

SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 22035.





...HALES

