[BNAWX] Severe Storm Outlook Narrative

[EMWIN Server]

ACUS11 KWNS 250735
SWOMCD
SPC MCD 250735
NCZ000-GAZ000-TNZ000-ALZ000-250830-

MESOSCALE DISCUSSION 0137
NWS STORM PREDICTION CENTER NORMAN OK
0135 AM CST FRI FEB 25 2011

AREAS AFFECTED...FAR SERN TN...ERN AND CENTRAL AL...WRN AND NRN
GA...AND FAR SWRN NC

CONCERNING...SEVERE THUNDERSTORM WATCH 18...

VALID 250735Z - 250830Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 18
CONTINUES.

A STABLE AIR MASS E OF WW 18 SUGGESTS A NEW WW SHOULD NOT BE NEEDED.

AT 0730Z...REGIONAL RADAR IMAGERY SHOWED A FAST MOVING /40-45 KT/
CONVECTIVE LINE EXTENDING SSWWD FROM ERN TN...FAR NWRN GA...TO
NERN...CENTRAL AND SWRN AL.  AIR MASS ALONG AND EAST OF THIS LINE IS
RATHER STABLE AS COMPARED TO LOCATIONS MUCH FARTHER TO THE SW IN THE
SRN EXTENT OF THE LOWER MS VALLEY.  THE DRASTIC REDUCTION IN
LIGHTNING PRODUCTION SINCE 05-06Z FROM KY/TN INTO AL IS INDICATIVE
OF THIS ACTIVITY OUTRUNNING THE GREATER INSTABILITY.

ALTHOUGH INSTABILITY IS QUITE WEAK...STRONG HEIGHT FALLS /60-120
METERS PER 12 HR AT 500 MB/ WITHIN THE SRN EXTENT OF THE PROGRESSIVE
SHORTWAVE TROUGH ADVANCING ENEWD THROUGH THE OH/TN VALLEYS OVERNIGHT
SHOULD CONTINUE TO SUPPORT A LOW TOPPED LINE OF CONVECTION.  AREA
VADS INDICATED 50-60 KT SWLY WINDS AT 0.5 KM AGL AHEAD OF THE
CONVECTION.  THIS COMBINED WITH THE FAST EWD MOVEMENT OF THE LINE
SUGGESTS LOCALLY STRONG WIND GUSTS WILL BE POSSIBLE AS THE HIGHER
MOMENTUM AIR REACHES IN THE SURFACE WITH ANY DOWNDRAFT.

..PETERS.. 02/25/2011

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

ATTN...WFO...GSP...MRX...FFC...BMX...

LAT...LON   35908363 35358313 33008419 32358564 32258682 32368717
            33718578 34708502 35098466 35658404 35908363


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