Storm Prediction Center NOAA NWS NCEP
Severe Thunderstorm Watch 257


URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 257
STORM PREDICTION CENTER NORMAN OK
534 PM CDT SUN MAY 20 2001

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

   NORTHERN ALABAMA                            
   EXTREME NORTHEAST MISSISSIPPI                        
   WESTERN AND MIDDLE TENNESSEE                          

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 600 PM UNTIL 1000
PM CDT.

HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 80 STATUTE MILES
EAST AND WEST OF A LINE FROM 55 MILES SOUTH OF MUSCLE SHOALS
ALABAMA TO 40 MILES NORTH NORTHEAST OF NASHVILLE TENNESSEE.

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.

OTHER WATCH INFORMATION...THIS SEVERE THUNDERSTORM WATCH REPLACES
SEVERE THUNDERSTORM WATCH NUMBER 254.  WATCH NUMBER 254 WILL NOT BE
IN EFFECT AFTER 600 PM CDT.  CONTINUE...WW 255...WW 256...

DISCUSSION...BAND OF STRONG/SEVERE STORMS ASSOCIATED WITH LONG-
LIVED MESOSCALE COMPLEX IS EXPECTED TO CONTINUE EWD INTO MODERATELY
UNSTABLE AIR MASS WITH SBCAPE TO 2000 J/KG.  WINDS ALOFT ARE
INCREASING FROM THE SOUTHWEST WITH 30-40 KT IN THE MIDDLE LEVELS
PROVIDING SUFFICIENT SHEAR TO MAINTAIN THREAT FOR DAMAGING WINDS
AND HAIL.


AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1 INCH EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. 
A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.  MEAN STORM MOTION
VECTOR 24025.


...WEISS



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