Severe Storm Outlook Narrative (AC)
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000
ACUS11 KWNS 251436
SWOMCD
SPC MCD 251435
ALZ000-FLZ000-MSZ000-LAZ000-251630-

MESOSCALE DISCUSSION 0452
NWS STORM PREDICTION CENTER NORMAN OK
0935 AM CDT SAT APR 25 2015

AREAS AFFECTED...SERN TX INTO LA AND SRN MS

CONCERNING...SEVERE THUNDERSTORM WATCH 109...

VALID 251435Z - 251630Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 109
CONTINUES.

SUMMARY...THE SEVERE THREAT IS MOVING MOSTLY OFFSHORE THE UPPER TX
COAST THIS MORNING...WITH A DEVELOPING THREAT ACROSS MUCH OF SRN LA
INTO SRN MS LATER TODAY. THE PRIMARY SEVERE THREATS ARE DAMAGING
WIND AND LARGE HAIL...AND ANOTHER WATCH IS LIKELY DOWNSTREAM ACROSS
LA AND MS.

DISCUSSION...CLUSTERS OF STRONG TO SEVERE STORMS CONTINUE TO MOVE
RAPIDLY EWD ACROSS SERN TX INTO SWRN LA WITH LEADING OUTFLOW
BOUNDARY. WHILE SOME CELLS MAY BE CAPABLE OF HAIL OVER SERN TX
BEHIND THIS BOUNDARY...OVERALL THE SEVERE THREAT IS DECREASING.

THE MAIN SEVERE THREAT IS EXPECTED TO DEVELOP AHEAD OF THE OUTFLOW
BOUNDARY FROM SRN LA INTO SRN MS/AL WHERE HEATING WILL LEAD TO
ADDITIONAL DESTABILIZATION WITH AMPLE MOISTURE AND DEEP-LAYER
SHEAR/FLOW IN PLACE. THE STRONG MEAN-LAYER FLOW AND RELATIVELY STEEP
LAPSE RATES ALOFT GIVEN THE MOIST AIR MASS WILL FAVOR BOTH DAMAGING
WINDS AND LARGE/DAMAGING HAIL. THIS ACTIVITY WILL LIKELY EVOLVE OUT
OF THE ACTIVITY OVER SWRN LA AND JUST OFFSHORE.

..JEWELL.. 04/25/2015

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...MOB...JAN...LIX...LCH...

LAT...LON   29679360 31069231 31679046 31848845 31458780 30958764
            30488751 30208761 29718767 29118797 28888915 28989085
            29449246 29419339 29679360



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