

190 

WWUS20 KWNS 312303

SEL1

SPC WW 312303

ALZ000-TNZ000-010400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 331

NWS STORM PREDICTION CENTER NORMAN OK

600 PM CDT THU MAY 31 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN ALABAMA

       MIDDLE TENNESSEE



EFFECTIVE THIS THURSDAY EVENING FROM 600 PM UNTIL 1100 PM CDT.



HAIL TO 1.5 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 75

STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTH

NORTHWEST OF NASHVILLE TENNESSEE TO 25 MILES SOUTH OF MUSCLE

SHOALS ALABAMA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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...CONTINUE...WW 328...WW 329...WW 330...



DISCUSSION...TSTM BAND IN NE MS/W TN MAY INCREASE IN STRENGTH THIS

EVE AS IT CONTINUES ENE INTO RELATIVELY UNDISTURBED ENVIRONMENT

ACROSS NRN AL/MIDDLE TN.  OTHER STORMS MAY FORM AHEAD OF THE BAND AS

LARGE SCALE ASCENT INCREASES WITH THE APPROACH OF UPR VORT NOW

NEARING MEMPHIS.  20-25 KT WSWLY DEEP SHEAR MAY SUPPORT A FEW

SUSTAINED STORMS WITH LOCALLY DMGG WIND/MARGINALLY SVR HAIL.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 24025.





...CORFIDI

