

473 

WWUS20 KWNS 040250

SEL8

SPC WW 040250

LAZ000-TXZ000-040800-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 138

NWS STORM PREDICTION CENTER NORMAN OK

950 PM CDT TUE APR 3 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF NORTHERN AND CENTRAL LOUISIANA

       EAST CENTRAL TEXAS



EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 950 PM

UNTIL 300 AM 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 55

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES WEST OF

LUFKIN TEXAS TO 20 MILES NORTH NORTHEAST OF ALEXANDRIA LOUISIANA.

 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU8).



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...THIS SEVERE THUNDERSTORM WATCH REPLACES

SEVERE THUNDERSTORM WATCH NUMBER 134...TORNADO WATCH NUMBER 135.

WATCH NUMBER 134 135 WILL NOT BE IN EFFECT AFTER 950 PM CDT.

CONTINUE...WW 136...WW 137...



DISCUSSION...ONGOING LINE OF STORMS FROM NW LA INTO E TX WILL LIKELY

CONTINUE TO SPREAD SEWD OVERNIGHT INTO A VERY MOIST/UNSTABLE WARM

SECTOR FEEDING THE STORMS FROM SE TX/SW LA.  ADDITIONAL STORM

DEVELOPMENT SEWD OVERNIGHT WILL BE SUPPORTED BY LIFT ALONG THE NW-SE

ORIENTED OUTFLOW BOUNDARY ACROSS CENTRAL/NW LA...AND THE MERGER OF

THIS OUTFLOW WITH THE GUST FRONT ACCOMPANYING THE STRONG/SEVERE

STORMS ACROSS NW LA/E TX.  HIGH-LEVEL FLOW GETS WEAKER WITH EWD

EXTENT...BUT STRONG LOW-LEVEL INFLOW AND THE STRONG INSTABILITY WILL

MAINTAIN A RISK OF OCCASIONAL DAMAGING WINDS/LARGE HAIL THROUGH THE

OVERNIGHT HOURS.



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 31020.





...THOMPSON

