WATCHES: Severe Thunderstorm Watch Number 140

WWUS20 KWNS 141211
SEL0
SPC WW 141211
LAZ000-MSZ000-141800-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 140
NWS STORM PREDICTION CENTER NORMAN OK
710 AM CDT SAT APR 14 2007

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

SOUTHEAST LOUISIANA
CENTRAL MISSISSIPPI

EFFECTIVE THIS SATURDAY MORNING AND AFTERNOON FROM 710 AM UNTIL
100 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 60
STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES WEST OF
COLUMBUS MISSISSIPPI TO 20 MILES EAST SOUTHEAST OF BATON ROUGE
LOUISIANA. 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.

OTHER WATCH INFORMATION...CONTINUE...WW 139...

DISCUSSION...BROKEN FRONTAL SQUALL LINE CONTINUES TO MOVE EWD FROM
LA INTO WRN MS...WHILE ADDITIONAL PRE-FRONTAL STORMS ARE FORMING IN
SE LA. GRADUAL LOW-LEVEL MOISTENING ACROSS SE LA AND SRN/CENTRAL MS
IS HELPING TO MAINTAIN AT LEAST WEAK SURFACE-BASED INSTABILITY...AND
ADDITIONAL DESTABILIZATION IS EXPECTED LATER THIS MORNING.
ALSO...LOCAL VWP/S SHOW LARGELY UNIDIRECTIONAL PROFILES WITH STRONG
SPEED SHEAR THROUGH THE MID LEVELS...WHICH SUGGESTS THAT THE PRIMARY
SEVERE STORM THREATS IN THE SHORT TERM WILL BE DAMAGING WINDS AND
LARGE HAIL WITH STORMS EMBEDDED IN THE LINE.

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 24035.

..THOMPSON

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