WATCHES: Severe Thunderstorm Watch Number 345

WWUS20 KWNS 041925
SEL5
SPC WW 041925
LAZ000-TXZ000-050300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 345
NWS STORM PREDICTION CENTER NORMAN OK
225 PM CDT MON JUN 4 2007

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

SOUTHWEST LOUISIANA
CENTRAL AND SOUTHEAST TEXAS

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 225 PM UNTIL
1000 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 55
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 75 MILES WEST OF
AUSTIN TEXAS TO 15 MILES EAST NORTHEAST OF LAKE CHARLES
LOUISIANA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).

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...SCATTERED THUNDERSTORMS ARE DEVELOPING ALONG A DIFFUSE
SURFACE BOUNDARY FROM THE HILL COUNTRY EWD INTO SE TX. MODERATE
INSTABILITY IS PRESENT ALONG AND S OF THIS BOUNDARY...WHILE DEEP
LAYER SPEED SHEAR IS SUFFICIENT FOR A FEW SUPERCELLS IN THE BELT OF
STRONGER FLOW S OF AN MCV OVER N TX. LARGE HAIL WILL BE THE MAIN
THREAT INITIALLY...AND DAMAGING WINDS MAY ALSO BECOME A THREAT AS
STORMS MERGE AND GROW INTO LARGER CLUSTERS LATER THIS AFTERNOON.

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 30020.

..THOMPSON

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