[BNAWX] Severe Storm Outlook Narrative

[EMWIN Server]

ACUS11 KWNS 172053
SWOMCD
SPC MCD 172053
NCZ000-TNZ000-GAZ000-ALZ000-172230-

MESOSCALE DISCUSSION 1951
NWS STORM PREDICTION CENTER NORMAN OK
0353 PM CDT MON SEP 17 2012

AREAS AFFECTED...SE TN...NE AL...NW GA

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 172053Z - 172230Z

PROBABILITY OF WATCH ISSUANCE...40 PERCENT

SUMMARY...A TORNADO THREAT MAY DEVELOP ACROSS NE AL...NW GA AND SE
TN LATE THIS AFTERNOON AND THIS EVENING. WW ISSUANCE CAN NOT BE
RULED ACROSS THE REGION.

DISCUSSION...NUMEROUS THUNDERSTORMS ARE ONGOING ACROSS THE TN VALLEY
WHERE THE AIRMASS IS WEAKLY UNSTABLE. IN SPITE OF THIS...SOME CELLS
ARE SHOWING SIGNS OF ROTATION MAINLY DUE TO THE MODERATELY SHEARED
ENVIRONMENT. THE LATEST WSR-88D VWP AT HUNTSVILLE AL SHOWS SOME
DIRECTIONAL SHEAR IN THE BOUNDARY LAYER WITH AN ESTIMATED 0-1 KM
SHEAR OF 25 KT. THIS COMBINED WITH LOW LCL HEIGHTS...SFC DEWPOINTS
APPROACHING 70 F AND BACKED SFC WINDS MAY BE SUPPORTIVE OF AN
ISOLATED TORNADO THREAT THIS AFTERNOON. THE ACTIVITY WILL CONTINUE
TO BE MONITORED IN CASE WW ISSUANCE BECOMES NECESSARY.

..BROYLES/MEAD.. 09/17/2012

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

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

LAT...LON   33238572 33298679 33948757 34628735 35498637 35918524
            35738450 35188427 34538447 33238572


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