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WWUS20 KWNS 181601

SEL1

SPC WW 181601

ARZ000-LAZ000-TXZ000-CWZ000-190000-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 131

NWS STORM PREDICTION CENTER NORMAN OK

1100 AM CDT TUE MAR 18 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SMALL PART OF SOUTH CENTRAL ARKANSAS

       PARTS OF NORTHERN AND WESTERN LOUISIANA

       LARGE PART OF SOUTHEAST TEXAS

       COASTAL WATERS



EFFECTIVE THIS TUESDAY MORNING AND EVENING FROM 1100 AM UNTIL 700

PM CDT.



...THIS IS A PARTICULARLY DANGEROUS SITUATION...



DESTRUCTIVE TORNADOES...LARGE HAIL TO 2 INCHES IN DIAMETER...

THUNDERSTORM WIND GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE

POSSIBLE IN THESE AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 90 STATUTE

MILES EITHER SIDE OF A LINE FROM 55 MILES WEST SOUTHWEST OF

COLLEGE STATION TEXAS TO MONROE LOUISIANA.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU1).



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.



OTHER WATCH INFORMATION...CONTINUE...WW 130...



DISCUSSION...AS STRONG UPPER SYSTEM APPROACHES SRN

TX...THUNDERSTORMS WILL RAPIDLY INCREASE IN NUMBER AND INTENSITY

AHEAD OF COLD FRONT NOW MOVING EWD ACROSS SRN TX.  VERY STRONG DEEP

LAYER SHEAR PROFILES COUPLED WITH A DEEP MOIST MDTLY UNSTABLE AIR

MASS SUPPORTS TORNADIC SUPERCELLS.  POTENTIAL FOR STRONG TORNADOS TO

OCCUR GIVEN THE STRENGTH OF THE WINDS FIELDS AND FAVORABLE

THERMODYNAMICS.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 24040.





...HALES

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