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WWUS20 KWNS 111301

SEL5

SPC WW 111301

LAZ000-MSZ000-CWZ000-112000-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 95

NWS STORM PREDICTION CENTER NORMAN OK

800 AM CDT THU APR 11 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHEAST LOUISIANA

       SOUTHERN MISSISSIPPI

       COASTAL WATERS



EFFECTIVE THIS THURSDAY MORNING AND AFTERNOON FROM 800 AM UNTIL

300 PM CDT.



TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS

TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 90 STATUTE

MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH NORTHWEST OF

PINE BELT MISSISSIPPI TO 35 MILES WEST SOUTHWEST OF HOUMA

LOUISIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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...TSTMS ARE EXPECTED TO GRADUALLY INCREASE ACROSS THE

WATCH AREA THIS MORNING AS FORCING FOR ASCENT STRENGTHENS AHEAD OF

SHORT-WAVE TROUGH APPROACHING FROM SRN TX.  CONTINUED

HEATING/MOISTENING OF THE PRE-FRONTAL BOUNDARY LAYER SHOULD

GRADUALLY REMOVE THE CAP OBSERVED BY THE 12Z REGIONAL

SOUNDINGS...YIELDING MLCAPE OF 1000-2000 J/KG.  WHEN COUPLED WITH

MODERATELY STRONG LOW-LEVEL AND DEEP-LAYER SHEAR /SEE 12Z JAN

SOUNDING/...THE SETUP WILL SUPPORT A MIXTURE OF BOWING AND SUPERCELL

STRUCTURES CAPABLE OF DAMAGING WINDS AND A FEW TORNADOES.



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

SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND

GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.

MEAN STORM MOTION VECTOR 24030.





...MEAD

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