Severe Storm Outlook Narrative (AC)
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ACUS11 KWNS 240104
SWOMCD
SPC MCD 240103
FLZ000-GAZ000-ALZ000-240230-

MESOSCALE DISCUSSION 1990
NWS STORM PREDICTION CENTER NORMAN OK
0703 PM CST TUE DEC 23 2014

AREAS AFFECTED...CENTRAL AND SRN AL...FL PANHANDLE...AND WRN/SWRN GA

CONCERNING...TORNADO WATCH 561...

VALID 240103Z - 240230Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 561 CONTINUES.

SUMMARY...IN THE SHORT-TERM /THROUGH 02Z/...TWO PRIMARY ZONES OF WW
561 CAN EXPECT TO HAVE A CONTINUED THREAT FROM STRONG TO SEVERE
STORMS.  TWO NNE-SSW ORIENTED LINES OF STORMS MOVING EWD THROUGH
CENTRAL AND SWRN AL AND THE WRN FL PANHANDLE WILL RESULT IN A THREAT
FOR DAMAGING WINDS AND A TORNADO OR TWO.  FARTHER EAST...A SW-NE
ORIENTED CORRIDOR OF STRONG TO SEVERE STORMS WILL CONTINUE TO AFFECT
THE ERN FL PANHANDLE INTO SWRN GA...WITH A TORNADO THREAT AND
DAMAGING WINDS.

SOME COUNTIES NEAR AND SOUTH OF ATLANTA GA MAY NEED TO BE ADDED TO
WW 561 BY 02Z...IF THE AIR MASS CAN DESTABILIZE SUFFICIENTLY TO
SUSTAIN A SEVERE WEATHER THREAT FROM A FAST-MOVING LINE OF STORMS IN
CENTRAL AL.

DISCUSSION...AT 0030Z...MOSAIC RADAR IMAGERY SHOWED A FAST-MOVING
LINE OF STORMS TRACKING ENEWD AT 40-50 KT ACROSS CENTRAL AL...WITH
THESE STORMS EXTENDING FROM NRN SHELBY COUNTY SSWWD TO MONROE
COUNTY.  IN THIS LATTER COUNTY...THE AFOREMENTIONED LINE OF STORMS
AND ATTENDANT OUTFLOW BOUNDARY WERE BEGINNING TO MERGE WITH A
NNE-SSW ORIENTED PRE-FRONTAL CONFLUENCE ZONE OVER SWRN AL.  THE
FAST-MOVING LINE OF STORMS WAS LOCATED SOUTH OF THE WRN PORTION OF A
SYNOPTIC WARM FRONT WHICH EXTENDED FROM NEAR KBHM INTO WEST-CENTRAL
GA /NEAR KLGC/ THEN SEWD TO THE GA COAST NORTH OF KSSI.  STORMS
ACROSS CENTRAL TO EAST-CENTRAL AL SHOULD PRODUCE A PRIMARY THREAT
FOR DAMAGING WINDS...THOUGH ENHANCED LOW-LEVEL SHEAR /EFFECTIVE SRH
OF 300-500 M2 PER S2/ WAS OBSERVED INVOF THE STRONGEST PORTION OF
THE LLJ.  THIS WILL CONTINUE TO SUPPORT LOW-LEVEL STORM ROTATION AND
A TORNADO THREAT...THOUGH THIS THREAT SHOULD BE SOMEWHAT LIMITED
WITH NRN EXTENT GIVEN A MORE STABLE BOUNDARY LAYER AT BHM AND FFC
PER 00Z SOUNDINGS.

MEANWHILE...GREATER MOISTURE /SURFACE DEW POINTS INTO THE MID 60S/
EXISTED FROM SWRN AL THROUGH THE WRN AND SRN PORTIONS OF THE FL
PANHANDLE...GENERALLY ALONG A SECOND WARM FRONT MARKING THE NWD
RETURN OF MARITIME-TROPICAL AIR.  THIS BETTER MOISTURE CONTENT AIR
MASS AND STRONGER INSTABILITY SHOULD RESULT IN A GREATER TORNADO
POTENTIAL TENDING TO BE NEAR AND SOUTH OF THIS WNW-ESE ORIENTED WARM
FRONT.  EFFECTIVE SRH OF 200-400 M2/S2 IS MAXIMIZED ALONG THIS
FRONT.

..PETERS.. 12/24/2014

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

ATTN...WFO...JAX...FFC...TAE...BMX...MOB...

LAT...LON   29868757 30628768 31168743 32448658 33758623 33668604
            33448505 32958414 32218332 31138322 30098317 29658297
            29178331 29238383 29188521 29168607 29818647 29868757



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