WATCHES: Severe Thunderstorm Watch Number 337

WWUS20 KWNS 031720
SEL7
SPC WW 031720
LAZ000-TXZ000-032300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 337
NWS STORM PREDICTION CENTER NORMAN OK
1220 PM CDT SUN JUN 3 2007

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

WESTERN AND SOUTHWESTERN LOUISIANA
EXTREME SOUTHEAST TEXAS

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 1220 PM UNTIL
600 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 EITHER SIDE OF A LINE FROM 75 MILES WEST NORTHWEST
OF FORT POLK LOUISIANA TO 75 MILES SOUTH SOUTHEAST OF ALEXANDRIA
LOUISIANA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).

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 336...

DISCUSSION...A WELL-DEVELOPED MCS OVER E TX WILL CONTINUE MOVING
ESEWD AT ROUGHLY 40 KT INTO WRN LA THIS AFTERNOON. SURFACE HEATING
HAS CONTRIBUTED TO MODERATE-STRONG INSTABILITY IN ADVANCE OF THE MCS
ACROSS SE TX AND WRN LA...AND A NARROW BELT OF 40-50 KT MID LEVEL
FLOW WILL ALSO HELP MAINTAIN THE ORGANIZED CONVECTIVE SYSTEM WITH
FAST COLD POOL MOTION. DAMAGING WINDS WILL BE THE MAIN SEVERE
THREAT...THOUGH ISOLATED LARGE HAIL MAY ALSO OCCUR WITH THE MOST
INTENSE STORMS.

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 550. MEAN STORM
MOTION VECTOR 30040.

..THOMPSON

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
To unsubscribe from WX-STORM send e-mail to LISTSERV@PO.UIUC.EDU with
"unsub wx-storm" in the body of your message. For more information write chris@lib.siu.edu.