

000 

WWUS20 KWNS 182353

SEL3

SPC WW 182353

ARZ000-LAZ000-TXZ000-CWZ000-190700-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 133

NWS STORM PREDICTION CENTER NORMAN OK

645 PM CDT TUE MAR 18 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHERN ARKANSAS

       WESTERN AND CENTRAL LOUISIANA

       SOUTHEAST TEXAS

       COASTAL WATERS



EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 645 PM

UNTIL 200 AM CDT.



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 135 STATUTE

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

HOUSTON TEXAS TO 35 MILES SOUTH OF MONROE LOUISIANA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU3).



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...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 131. WATCH NUMBER 131 WILL NOT BE IN EFFECT AFTER

645 PM CDT. CONTINUE...WW 132...



DISCUSSION...LINE OF FORCED STORMS WITH EMBEDDED SUPERCELLS SHOULD

ACCELERATE ENE ACROSS WW THROUGH THE EVENING...AS INDIVIDUAL STORMS

MOVE MORE RAPIDLY NNE ALONG IT.  HEIGHT FALLS/UVV ASSOCIATED WITH

EJECTING SW TX UPR VORT EXPECTED TO REMAIN LARGELY W OF SQLN...THUS

ASSOCIATED WARM SECTOR DESTABILIZATION SHOULD BE MINIMAL.

NEVERTHELESS... COMBINATION OF EXISTING VERY STRONG LOW- TO

MID-LEVEL WIND FIELD...AXIS OF RICH MOISTURE IMMEDIATELY AHEAD OF

LINE...AND ENHANCED CONVERGENCE INVOF DEVELOPING SFC WAVE IN SRN AR

WILL YIELD A CONTINUED RISK FOR A FEW TORNADOES.  THE TORNADOES MAY

BE RAIN-WRAPPED...AND ACCOMPANIED BY LOCALLY DMGG WIND/MARGINALLY

SVR HAIL.



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

500. MEAN STORM MOTION VECTOR 23040.





...CORFIDI

