[BNAWX] Severe Storm Outlook Narrative

[Nashville EMWIN]

ACUS11 KWNS 202036
SWOMCD
SPC MCD 202035
TNZ000-NCZ000-GAZ000-ALZ000-202200-

MESOSCALE DISCUSSION 2061
NWS STORM PREDICTION CENTER NORMAN OK
0335 PM CDT FRI AUG 20 2004

AREAS AFFECTED...NRN/WRN AL...SRN MIDDLE TN...PORTIONS ERN TN AND
NWRN GA

CONCERNING...SEVERE THUNDERSTORM WATCH 767...

VALID 202035Z - 202200Z

LINE OF TSTMS IS MOVING EWD 20-25 KT ACROSS PORTIONS WRN/NRN
AL...FROM LIMESTONE COUNTY AL TO GREENE COUNTY MS.  WHILE ISOLATED
SEVERE GUSTS MAY OCCUR WITHIN SRN PORTION OF THIS LINE OVER
CENTRAL/SWRN AL...PRIND GREATEST SEVERE POTENTIAL WILL REMAIN OVER
NRN PORTION WHERE DEEP-LAYER SHEAR REMAINS GREATEST.  ADDITIONAL
CLUSTER OF TSTMS OVER SRN MIDDLE TN SHOULD MOVE EWD 20-25 KT AS WELL
TOWARD CHA AREA WITH DAMAGING GUSTS POSSIBLE.  SEVERE ALSO IS
POSSIBLE WITH ACTIVITY FORMING AHEAD OF LINE AND MOVING ACROSS NERN
AL TOWARD NWRN GA.

VERTICAL SHEAR ACROSS PRECONVECTIVE PORTION OF WW REMAINS FAVORABLE
WITH 0-6 KM SHEARS 30-35 KT AND 0-3 KM SRH 150-200 J/KG.  ALTHOUGH
LAPSE RATES ALOFT ARE ONLY AROUND 6 DEG C/KM...DEEP AND RICH MOIST
LAYER IN LOW LEVELS COMBINED WITH DIABATIC HEATING YIELDS 1500-2000
J/KG MLCAPE IN FCST SOUNDINGS. WITH SIMILARLY UNSTABLE AIR MASS IN
PLACE ACROSS PORTIONS ERN TN AND NWRN GA...AND AT LEAST MARGINAL
DEEP-LAYER SHEAR...SEVERE POTENTIAL MAY EXTEND E OF PRESENT WW.
WILL MONITOR FOR POSSIBILITY OF ADDITIONAL ISSUANCE...SINCE COLD
POOL AND ASSOCIATED FORWARD PROPAGATION MAY DRIVE PRIMARY LINE OF
TSTMS INTO GA AND SERN TN BEFORE DISSIPATION.

..EDWARDS.. 08/20/2004

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

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

35798554 36128503 36248435 35868403 35288423 34288454
33588522 33318583

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