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000 

WWUS20 KWNS 211939

SEL0

SPC WW 211939

LAZ000-MSZ000-TXZ000-CWZ000-220300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 70

NWS STORM PREDICTION CENTER NORMAN OK

140 PM CST THU FEB 21 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       CENTRAL AND SOUTHWEST LOUISIANA

       WILKINSON COUNTY MISSISSIPPI

       SOUTHEASTERN TEXAS

       COASTAL WATERS



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 140 PM UNTIL

900 PM CST.



TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 30 MILES WEST OF HUNTSVILLE

TEXAS TO 20 MILES SOUTHEAST OF BATON ROUGE LOUISIANA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU0).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



DISCUSSION...THUNDERSTORMS WILL CONTINUE TO INTENSIFY/INCREASE

ACROSS SERN TX INTO SWRN/S-CENTRAL LA THROUGH THE AFTERNOON AS

CAPPING WEAKENS WITHIN VERY MOIST BOUNDARY LAYER.  DEEP ASCENT WILL

ALSO INCREASE THROUGH THE DAY AHEAD OF STRONG MID/UPPER LEVEL TROUGH

NOW MOVING ACROSS THE SRN PLAINS.  IN RESPONSE...A SURFACE LOW WILL

DEEPEN AND LIFT NEWD INTO CENTRAL LA THROUGH THE MID EVENING.

EFFECTIVE SHEAR REMAINS MORE THAN ADEQUATE FOR SUPERCELLS...WITH

SUFFICIENT LOW LEVEL SHEAR AND LOW LCL HEIGHTS FOR ADDITIONAL

TORNADO THREAT.  ISOLATED DAMAGING WINDS AND LARGE HAIL ARE

ADDITIONAL HAZARDS.



AVIATION...TORNADOES AND 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

450. MEAN STORM MOTION VECTOR 25030.





...EVANS

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