WATCHES: Severe Thunderstorm Watch Number 233

WWUS20 KWNS 291736
SEL3
SPC WW 291736
LAZ000-MSZ000-CWZ000-300100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 233
NWS STORM PREDICTION CENTER NORMAN OK
1235 PM CDT SAT MAY 29 2010

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

LARGE PART OF SOUTHEASTERN LOUISIANA
MUCH OF SOUTHERN MISSISSIPPI
COASTAL WATERS

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 1235 PM UNTIL
800 PM CDT.

HAIL TO 2 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 105
STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES NORTH
NORTHEAST OF MC COMB MISSISSIPPI TO 40 MILES SOUTHEAST OF HOUMA
LOUISIANA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

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 232...

DISCUSSION...AIR MASS TO W AND S OF UPPER LOW NEAR KJAN HAS BECOME
MDTLY UNSTABLE WITH MLCAPES AOA 2500 J/KG. WITH A CYCLONIC FLOW OF
RELATIVELY COOL/STEEP MID LEVEL LAPSE RATES ASSOCIATED WITH UPPER
LOW...STORMS WILL INCREASE RAPIDLY IN NUMBER AND INTENSITY AS THEY
MOVE/PROPAGATE SEWD ACROSS THE WATCH. MULTICELLULAR/PULSE MODE IN
RELATIVELY WEAK SHEAR REGIME SHOULD SUPPORT BOTH LARGE HAIL AND
DAMAGING DOWNBURSTS WINDS WITH STRONGEST STORMS.

AVIATION...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 31015.

...HALES

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