

679 

WWUS20 KWNS 300244

SEL6

SPC WW 300244

ALZ000-LAZ000-MSZ000-CWZ000-301000-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 76

NWS STORM PREDICTION CENTER NORMAN OK

940 PM CDT TUE MAR 29 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       FAR SOUTHWEST ALABAMA

       SOUTHEAST LOUISIANA

       SOUTHERN MISSISSIPPI

       COASTAL WATERS



EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 940 PM

UNTIL 500 AM CDT.



TORNADOES...HAIL TO 2 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 65 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 40 MILES WEST OF BATON ROUGE

LOUISIANA TO 60 MILES NORTHEAST OF GULFPORT MISSISSIPPI.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU6).



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 72...WW 73...WW 74...WW

75...



DISCUSSION...WEAK SURFACE LOW W OF BTR IS FORECAST TO DEVELOP NEWD

THROUGH CNTRL MS OVERNIGHT WITH AN ASSOCIATED...DIFFUSE WARM FRONT

LIFTING NWD THROUGH SRN MS AND SWRN AL.  BACKGROUND FORCING FOR

ASCENT --PROVIDED BY WAA/ISENTROPIC UPGLIDE-- WILL BE SUPPORTIVE OF

TSTM CLUSTERS WITHIN EXPANDING WARM SECTOR. 150-250 M2/S2 0-1 KM SRH

AND 50-60 KT OF EFFECTIVE BULK SHEAR WILL PROMOTE UPDRAFT ROTATION

WITH THE MOST INTENSE STORMS WITH THE THREAT FOR A FEW

TORNADOES...DAMAGING WINDS AND LARGE HAIL.



AVIATION...TORNADOES AND 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

500. MEAN STORM MOTION VECTOR 25030.





...MEAD

