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396 

WWUS20 KWNS 121257

SEL3

SPC WW 121257

LAZ000-TXZ000-CWZ000-122100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 143

NWS STORM PREDICTION CENTER NORMAN OK

800 AM CDT SUN APR 12 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHWEST LOUISIANA

       SOUTHEAST TEXAS

       COASTAL WATERS



EFFECTIVE THIS SUNDAY MORNING AND AFTERNOON FROM 800 AM UNTIL 400

PM CDT.



TORNADOES...HAIL TO 2 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 EITHER SIDE OF A LINE FROM 25 MILES WEST OF HOUSTON TEXAS

TO 25 MILES NORTHEAST OF LAFAYETTE 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...CONTINUE...WW 142...



DISCUSSION...SCTD SLIGHTLY ELEVATED STORMS THAT HAVE PERSISTED SINCE

EARLIER THIS MORNING OVER THE NWRN GULF AND THE UPR TX GULF CSTL PLN

HAVE SHOWN A STRENGTHENING TENDENCY IN THE PAST HOUR...POSSIBLY IN

RESPONSE TO INCREASED UPR DIFFLUENCE WITH THE CONTINUED EWD MOTION

OF NM UPR LOW.  COUPLED WITH INCREASINGLY RICH LOW LVL MOISTURE

INFLOW... STRENGTHENING LOW TO MID LVL WIND FIELD...AND SFC

HEATING...SETUP MAY BECOME SUPPORTIVE OF LOW LVL STORM

ROTATION/TORNADOES.



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

SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 22035.





...CORFIDI

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