

978 

WWUS20 KWNS 111700

SEL1

SPC WW 111700

LAZ000-TXZ000-CWZ000-120000-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 71

NWS STORM PREDICTION CENTER NORMAN OK

1155 AM CDT SUN MAR 11 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHWEST AND NORTHERN LOUISIANA

       EAST TEXAS

       COASTAL WATERS



EFFECTIVE THIS SUNDAY MORNING AND EVENING FROM 1155 AM UNTIL 700

PM 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 75 STATUTE

MILES EAST AND WEST OF A LINE FROM 45 MILES NORTH NORTHEAST OF

SHREVEPORT LOUISIANA TO 25 MILES SOUTH OF PORT ARTHUR TEXAS.  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.



DISCUSSION...STORMS ARE GRADUALLY INCREASING IN INTENSITY OVER SERN

TX AS THE SRN END OF A SHORT WAVE TROUGH ROTATES NEWD ACROSS CENTRAL

TX.  STRONG SOUTHERLY LOW LEVEL WINDS ARE TRANSPORTING MOISTURE NWD

TOWARD THE ARKLATEX REGION...WITH SUBSEQUENT DESTABILIZATION

EXPECTED THROUGH THE AFTERNOON.  LATEST KHGX VWP INDICATES STRONG

LOW- AND DEEP LAYER SHEAR ASSOCIATED WITH A CLOCKWISE TURNING

HODOGRAPH FAVORABLE FOR SUPERCELLS AND A THREAT FOR A FEW TORNADOES

TO DEVELOP.  ACTIVITY WILL DEVELOP NEWD WITH ADDITIONAL RISK FOR

DAMAGING WIND GUSTS WITHIN SMALL-SCALE BOWING LINE SEGMENTS.



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 23035.





...WEISS

