ACUS11 KWNS 241649
SWOMCD
SPC MCD 241648
MSZ000-LAZ000-241745-
MESOSCALE DISCUSSION 0555
NWS STORM PREDICTION CENTER NORMAN OK
1148 AM CDT WED APR 24 2013
AREAS AFFECTED...SE LA...SRN MS
CONCERNING...TORNADO WATCH 137...
VALID 241648Z - 241745Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 137 CONTINUES.
SUMMARY...AN ISOLATED SEVERE THREAT ACROSS SE LA SHOULD BECOME
MARGINAL EARLY THIS AFTERNOON. WW ISSUANCE IS NOT ANTICIPATED TO THE
EAST OF THE CURRENT WATCH.
DISCUSSION...SEVERAL STRONG TO SEVERE THUNDERSTORMS ARE CURRENTLY
ONGOING IN THE NEW ORLEANS AREA JUST AHEAD OF A COLD FRONT EXTENDING
SWWD FROM SRN MS INTO SE LA. OBJECTIVE ANALYSIS IS ESTIMATING MLCAPE
VALUES ARE AROUND 500 J/KG ACROSS WW 137 BUT INSTABILITY DROPS OFF
QUICKLY WITH EWD EXTENT. THE STRONG WIND SHEAR MAY SUPPORT A FEW
DAMAGING WIND GUSTS AND PERHAPS AN ISOLATED TORNADO OVER THE NEXT
HOUR BUT ANY SEVERE THREAT THAT CAN PERSIST TO WATCH EXPIRATION IS
EXPECTED TO BECOME INCREASINGLY MARGINAL.
..BROYLES/MEAD.. 04/24/2013
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...MOB...JAN...LIX...
LAT...LON 31088980 30399032 29659067 29209065 29059015 29018979
28838930 28968886 29308881 31018912 31088980
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