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WWUS20 KWNS 181046

SEL7

SPC WW 181046

LAZ000-TXZ000-CWZ000-181500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 27

NWS STORM PREDICTION CENTER NORMAN OK

450 AM CST SAT FEB 18 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHWEST LOUISIANA

       SOUTHEAST TEXAS

       COASTAL WATERS



EFFECTIVE THIS SATURDAY MORNING FROM 450 AM UNTIL 900 AM CST.



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 60

STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTH OF PORT

ARTHUR TEXAS TO 25 MILES EAST SOUTHEAST OF PALACIOS TEXAS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU7).



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.



DISCUSSION...A LINE OF INTENSE THUNDERSTORMS HAS DEVELOPED

ALONG/AHEAD OF SURFACE COLD FRONT SURGING EASTWARD ACROSS SOUTHEAST

TX.  THE SURFACE AIR MASS AHEAD OF THE STORMS IS ONLY MARGINALLY

UNSTABLE AT BEST.  HOWEVER...INCREASING MESOSCALE ORGANIZATION OF

THE LINE SUGGESTS SOME POTENTIAL OF DAMAGING WIND GUSTS REACHING THE

SURFACE.  OTHERWISE...HAIL WILL ALSO BE POSSIBLE IN THE STRONGER

CELLS.



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 450. MEAN STORM

MOTION VECTOR 25040.





...HART

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