

000 

WWUS20 KWNS 031338

SEL6

SPC WW 031338

TXZ000-031900-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 336

NWS STORM PREDICTION CENTER NORMAN OK

840 AM CDT SUN JUN 3 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTH CENTRAL AND EAST CENTRAL TEXAS



EFFECTIVE THIS SUNDAY MORNING AND AFTERNOON FROM 840 AM UNTIL 200

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 65

STATUTE MILES EITHER SIDE OF A LINE FROM 35 MILES SOUTH SOUTHWEST

OF DALLAS TEXAS TO 25 MILES EAST NORTHEAST OF LUFKIN TEXAS.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU6).



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...WELL-DEFINED MCS WITH ATTENDANT MCV IN THE MID LEVELS

WILL LIKELY CONTINUE MOVING ESEWD/SEWD THROUGH THE MORNING.  SOME

INTENSIFICATION OF THE STORMS IS POSSIBLE AS THE BOUNDARY LAYER

WARMS AND DESTABILIZES IN ADVANCE OF THE CONVECTION...WHERE BOUNDARY

LAYER DEWPOINTS ARE ALREADY IN THE LOWER 70S AND MODERATE

INSTABILITY IS PRESENT.  IN ADDITION...A 40-50 KT MID LEVEL SPEED

MAX TRANSLATING ESEWD WILL HELP MAINTAIN THE ORGANIZED CONVECTIVE

STRUCTURE...AND WILL CONTRIBUTE TO RELATIVELY FAST STORM MOTION AND

WIND DAMAGE POTENTIAL.



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

