[BNAWX] Severe Storm Outlook Narrative

[EMWIN Server]

ACUS11 KWNS 261623
SWOMCD
SPC MCD 261623
VAZ000-TNZ000-NCZ000-GAZ000-ALZ000-261930-

MESOSCALE DISCUSSION 2032
NWS STORM PREDICTION CENTER NORMAN OK
1123 AM CDT SAT SEP 26 2009

AREAS AFFECTED...PORTIONS CENTRAL/NRN AL...NWRN GA...ERN
TN...EXTREME SWRN VA...EXTREME WRN NC.

CONCERNING...HEAVY RAINFALL

VALID 261623Z - 261930Z

NUMEROUS TSTMS ARE FCST TO SHIFT EWD TO ENEWD ACROSS DISCUSSION AREA
WITH COMMON RAIN RATES 1-2 INCHES/HOUR...AND LOCALIZED/BRIEF RATES
NEAR 3 INCHES/HOUR.

BROAD AREA OF LOW LEVEL CONVERGENCE JUST ABOVE SFC...AND MID-UPPER
ASCENT...IS EVIDENT ACROSS SRN APPALACHIANS REGION...NEAR AND W OF
DECELERATING SFC COLD FRONT.  AS OF 16Z THIS FRONT WAS ANALYZED FROM
LOW OFFSHORE SC...WWD OVER SERN GA THEN NWWD ACROSS MCN AREA...WRN
FRINGES OF ATL AREA...AND SERN TN NEAR CHA...BECOMING ILL-DEFINED
FARTHER N ACROSS NERN TN.  FRONT SHOULD DRIFT WWD-SWWD ACROSS
CENTRAL/NWRN GA...ACTING AS FOCUS FOR ASCENT...IN ADDITION TO
LOCALIZED AREAS OF OROGRAPHIC LIFT OVER UPSLOPE/WINDWARD SLOPES IN
SRN APPALACHIANS.  INFLOW-LAYER AIR MASS WILL REMAIN CHARACTERIZED
BY VERY RICH LOW LEVEL MOISTURE...SUPPORTING PW 2-2.25 INCHES.
MODIFIED RAOBS AND RUC SOUNDINGS EACH SHOW VERY ROBUST MOIST LAYER
AVAILABLE FOR DEEP LIFT...WITH NEARLY SATURATED CONDITIONS THROUGH
MOST OF TROPOSPHERE AND 16-17.5 G/KG MEAN MIXING RATIOS DERIVED FROM
FFC/BMX SOUNDINGS.  TO EXACERBATE HEAVY RAIN HAZARD...CONSIDERABLE
MERGING OF TSTM BANDS AND CLUSTERS IS LIKELY FROM NRN AL NEWD TOWARD
SERN KY AND EXTREME SWRN VA...WHILE TRAINING OF ECHOES WILL OCCUR
ACROSS CENTRAL AL AND EVENTUALLY PARTS OF NW GA.

REF MESOSCALE DISCUSSION 2031 AND CONVECTIVE DAY-1 OUTLOOK FOR
COVERAGE OF SVR THREAT OVER PORTIONS OF THIS REGION.

..EDWARDS.. 09/26/2009

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

ATTN...WFO...GSP...MRX...FFC...OHX...BMX...HUN...

LAT...LON   33668778 34438723 35118631 35758541 37008194 36028212
            35268359 34338416 33248471 33188800 33668778



This weather bulletin was brought to you by:
www.nashvilleweather.net