Severe Storm Outlook Narrative (AC)
Issued by NWS

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000
ACUS01 KWNS 280046
SWODY1
SPC AC 280044

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0644 PM CST SAT DEC 27 2014

VALID 280100Z - 281200Z

...THERE IS A MRGL RISK OF SVR TSTMS ACROSS PARTS OF SRN LA AND SW
MS...

...SUMMARY...
ISOLATED SEVERE STORMS CAPABLE OF LOCALLY DAMAGING WINDS AND A BRIEF
TORNADO ARE POSSIBLE THIS EVENING ACROSS SOUTHERN LOUISIANA AND
SOUTHWEST MISSISSIPPI.

...LOWER MS VALLEY...
THE LATEST WATER VAPOR IMAGERY SHOWS A SUBTLE LOW-AMPLITUDE
SHORTWAVE TROUGH MOVING NEWD ACROSS THE LOWER MS VALLEY. AT THE
SFC...A COLD FRONT EXTENDS FROM FAR SE TX NEWD ACROSS NRN LA INTO
WRN MS WITH SCATTERED THUNDERSTORMS ONGOING JUST AHEAD OF THE FRONT.
A CORRIDOR OF LOW-LEVEL MOISTURE IS PRESENT ACROSS MUCH OF SRN LA
AND SRN MS WHERE SFC DEWPOINTS ARE IN THE UPPER 60S AND LOWER 70S F.
IN ADDITION...MESOANALYSIS SUGGESTS THAT STRONG LOW-LEVEL SHEAR
EXISTS ACROSS THE MOIST SECTOR. THE 00Z SOUNDING AT NEW ORLEANS
SHOWS 0-1 KM HELICITY NEAR 250 M2/S2. THIS COUPLED WITH RELATIVELY
LOW LCL HEIGHTS SHOULD BE ENOUGH FOR ROTATING STORMS THIS EVENING. A
BRIEF TORNADO AND A FEW STRONG WIND GUSTS WILL BE POSSIBLE. ANY
SEVERE THREAT SHOULD REMAIN VERY ISOLATED.

..BROYLES.. 12/28/2014



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