[BNAWX] Severe Storm Outlook Narrative

[EMWIN Server]

ACUS11 KWNS 201242
SWOMCD
SPC MCD 201242
SCZ000-NCZ000-GAZ000-TNZ000-ALZ000-KYZ000-201415-

MESOSCALE DISCUSSION 0928
NWS STORM PREDICTION CENTER NORMAN OK
0742 AM CDT FRI MAY 20 2005

AREAS AFFECTED...SRN TN/NERN AL INTO NRN GA AND NRN SC

CONCERNING...SEVERE THUNDERSTORM WATCH 298...299...

VALID 201242Z - 201415Z

THROUGH 14-15Z...GREATEST SEVERE WEATHER THREAT WILL EXIST ACROSS
SRN MIDDLE TN/NERN AL INTO NWRN GA.

LINE OF TSTMS HAS RE-INTENSIFIED OVER THE PAST HOUR OVER MIDDLE TN
INTO N-CNTRL AL...WITH LEADING EDGE OF MOST INTENSE ACTIVITY FROM
MARION COUNTY TN SWWD INTO LIMESTONE COUNTY IN N-CNTRL AL. BOTH 12Z
BMX AND FFC SOUNDINGS INDICATE THE PRESENCE OF MODERATE INSTABILITY
/I.E. MUCAPES OF 1000-1500 J/KG/ ATOP A NOCTURNAL SURFACE INVERSION.
 BREAKS IN CLOUDS ACROSS DOWNSTREAM AIR MASS /PER MORNING VISIBLE
IMAGERY/ SUGGEST THAT DIABATIC HEATING SHOULD ELIMINATE THIS
INVERSION BY MID TO LATE MORNING WITH STORMS BECOMING MORE
SURFACE-BASED WITH TIME. GIVEN ANTICIPATED INCREASE IN MID AND
HIGH-LEVEL WINDS WITH APPROACH OF OH VALLEY SHORTWAVE
TROUGH...CORRIDOR FROM CURRENT ACTIVITY SEWD ACROSS NRN GA WILL
BECOME INCREASINGLY SUPPORTIVE OF SEVERE STORMS CAPABLE OF DAMAGING
WINDS AND LARGE HAIL. ADDITIONAL BACKBUILDING DEVELOPMENT MAY OCCUR
OVER THE COURSE OF THE MORNING ACROSS NRN INTO CNTRL AL...POSSIBLY
REQUIRING THE ISSUANCE OF AN ADDITIONAL WW.

FARTHER TO THE E OVER NRN SC INTO WRN/CNTRL NC...AIR MASS IS MUCH
MORE STABLE AND WW 298 WILL BE ALLOWED TO EXPIRE AT 13Z.

..MEAD.. 05/20/2005

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

ATTN...WFO...RAH...ILM...CAE...GSP...MRX...FFC...LMK...OHX...BMX...HUN...PAH...

34658721 35708799 36738744 36508508 34808273 34938078
34937974 33878050 34068310 33408361

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