[MCD] SWOMCD

Sun Sep 25 20:43:05 UTC 2005

ACUS11 KWNS 252042
SWOMCD
SPC MCD 252041 
GAZ000-ALZ000-TNZ000-KYZ000-MSZ000-252215-

MESOSCALE DISCUSSION 2280
NWS STORM PREDICTION CENTER NORMAN OK
0341 PM CDT SUN SEP 25 2005

AREAS AFFECTED...PORTIONS MS...AL...MID TN.

CONCERNING...TORNADO WATCH 819...820...

VALID 252041Z - 252215Z

CONTINUE WWS ALONG/AHEAD OF MAJOR CONVECTIVE BANDS FROM WRN PORTION
MID TN SWWD ACROSS CENTRAL/SWRN MS.

TORNADO REPORTS HAVE BEEN RECEIVED FROM SUPERCELLS OVER
TUSCALOOSA...WINSTON AND FAYETTE COUNTIES AL DURING PAST HOUR. 
ENVIRONMENT FROM CENTRAL MS TO EXTREME NRN AL AND SRN MID TN REMAIN
FAVORABLE FOR TORNADOES...INVOF AXIS OF GREATEST BUOYANCY...AND
AMIDST FAVORABLE LOW LEVEL HODOGRAPHS. MODIFIED RAOBS AND RUC FCST
SOUNDINGS INDICATE NARROW CORRIDOR OF 500-1500 SBCAPE AND 250-1000
J/KG MLCAPE IN INFLOW REGION OF ACTIVITY OVER ERN MS AND
W-CENTRAL/NWRN AL.  BUOYANCY DIMINISHES MARKEDLY WITH NWD EXTENT
ACROSS MID TN -- N OF WEAK WARM FRONT AND IN AREA WHERE CLOUD COVER
AND PRECIP HAS SOMEWHAT OFFSET EFFECTS OF SFC WAA. 
HOWEVER...VERTICAL SHEAR REMAINS LARGE AND FAVORABLE FOR SUPERCELLS
ACROSS THIS WHOLE CORRIDOR...I.E. 0-1 KM SRH 200-400 J/KG AND
EFFECTIVE SHEARS AROUND 35-45 KT.  VERTICAL SHEAR AND BUOYANCY EACH
ARE EXPECTED TO DIMINISH WITH TIME OVER SRN PORTION WW 820...AS
DIABATIC HEATING WEAKENS AND AS PARENT LOW OVER ERN AR/MO BORDER
REGION WEAKENS AND LIFTS NEWD.

..EDWARDS.. 09/25/2005

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

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

31618720 31158806 31128974 31449146 32739011 33918883
35438824 36558855 36628682 36388612 34988557 33838539
33288542 32098658 

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