[BNAWX] Severe Storm Outlook Narrative

[EMWIN Server]

ACUS11 KWNS 182122
SWOMCD
SPC MCD 182122
GAZ000-TNZ000-ALZ000-MSZ000-182245-

MESOSCALE DISCUSSION 0127
NWS STORM PREDICTION CENTER NORMAN OK
0322 PM CST WED FEB 18 2009

AREAS AFFECTED...CNTRL MS INTO NERN GA

CONCERNING...TORNADO WATCH 24...

VALID 182122Z - 182245Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 24 CONTINUES.

THROUGH 23Z...EXPECT THE GREATEST THREAT FOR SUPERCELLS CAPABLE OF
LARGE HAIL...DAMAGING WINDS AND TORNADOES TO EXIST OVER NERN PORTION
OF WW AREA...NAMELY FROM JUST NE OF BHM TO NEAR OR E OF RMG.

AS OF 21Z...REGIONAL RADAR IMAGERY INDICATED SEVERE STORMS
/INCLUDING SUPERCELLS/ OVER CHATTOOGA AND FLOYD COUNTIES IN FAR NWRN
GA AND ST. CLAIR COUNTY AL MOVING GENERALLY EWD AT 45-50 KT.  AIR
MASS IN WAKE OF WARM FRONTAL PASSAGE OVER NERN GA IS RAPIDLY
DESTABILIZING AND MODIFICATION OF 18Z ATL/BHM SOUNDINGS FOR CURRENT
SURFACE CONDITIONS YIELDS MLCAPE APPROACHING 1000 J/KG.  IN ADDITION
TO SMALLER T/TD SPREADS AND RESULTANT LOWER LCL HEIGHTS OVER NERN AL
INTO NWRN GA...LOCAL VWPS AND RUC OBJECTIVE FIELDS INDICATE NOTABLY
STRONGER LOW-LEVEL SHEAR WITH 0-1 KM SHEAR OF 30-35 KT AND EFFECTIVE
SRH VALUES OF 300-400 M2/S2.  AS SUCH...ONGOING SUPERCELLS WILL
REMAIN CAPABLE OF TORNADOES IN ADDITION TO LARGE HAIL AND DAMAGING
WIND GUSTS.

FARTHER W...AN ISOLATED STORM CONTINUES TO ORGANIZE OVER LAUDERDALE
COUNTY MS AS OF 21Z.  GIVEN THE RATHER STRONGLY SHEARED ENVIRONMENT
AND SIMILAR THERMODYNAMIC CONDITIONS IN PLACE THROUGH CNTRL
AL...THIS STORM MAY BE ABLE TO PERSIST FOR THE NEXT FEW HOURS WITH
THE THREAT FOR DAMAGING WINDS...HAIL AND PERHAPS A TORNADO.

..MEAD.. 02/18/2009

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

ATTN...WFO...MRX...FFC...OHX...BMX...HUN...MOB...MEG...JAN...

LAT...LON   32829066 34538802 35458702 35248444 33578453 32788500
            31918596 31678775 31648976 31809091 32829066

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