WATCHES: Severe Thunderstorm Watch Number 50

WWUS20 KWNS 141828
SEL0
SPC WW 141828
ALZ000-LAZ000-MSZ000-150200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 50
NWS STORM PREDICTION CENTER NORMAN OK
125 PM CDT MON MAR 14 2011

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

WESTERN AND NORTHERN ALABAMA
EASTERN LOUISIANA
CENTRAL AND SOUTHERN MISSISSIPPI

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 125 PM UNTIL 900
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 APPROXIMATELY ALONG AND 75
STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES SOUTH
SOUTHEAST OF MC COMB MISSISSIPPI TO 55 MILES NORTH NORTHWEST OF
BIRMINGHAM ALABAMA. FOR A COMPLETE DEPICTION OF THE WATCH SEE
THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).

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...PRE-FRONTAL BAND OF TSTMS WILL CONTINUE TO INTENSIFY
THIS AFTERNOON IN ADVANCE OF COMPACT MID/UPPER-LEVEL LOW ADVANCING
THROUGH THE OZARK PLATEAU. RELATIVELY COOL MIDLEVEL TEMPERATURES
COUPLED WITH A WARMING/MOISTENING BOUNDARY WILL SUPPORT CORRIDORS OF
MODEST DESTABILIZATION INTO THIS EVENING WITH MLCAPE VALUES
APPROACHING 500-1500 J/KG. THIS DESTABILIZATION IN CONJUNCTION WITH
A GRADUALLY STRENGTHENING WIND FIELD AND RESULTANT 35-45 KT OF DEEP
SWLY SHEAR WILL BE SUPPORTIVE OF EMBEDDED BOWING STRUCTURES.

REGION FROM E-CNTRL MS INTO NRN AL WILL CONTINUE TO EXHIBIT
VERTICALLY-VEERING WIND PROFILES/LARGER LOW-LEVEL HODOGRAPHS INTO
THIS EVENING...AND AS SUCH SOME POTENTIAL FOR A BRIEF TORNADO OR TWO
WILL EXIST. HOWEVER...GIVEN THE EVOLVING LINEAR CONVECTIVE
MODE...DAMAGING WIND GUSTS APPEAR TO BE THE PRIMARY THREAT.

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 450. MEAN STORM MOTION
VECTOR 26035.

...MEAD

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