[BNAWX] Severe Storm Outlook Narrative

[EMWIN Server]

ACUS11 KWNS 280409
SWOMCD
SPC MCD 280409
NCZ000-SCZ000-TNZ000-GAZ000-ALZ000-280445-

MESOSCALE DISCUSSION 0648
NWS STORM PREDICTION CENTER NORMAN OK
1109 PM CDT WED APR 27 2011

AREAS AFFECTED...ERN AL...CENTRAL AND NRN GA...ERN TN...WRN NC...AND
UPSTATE SC

CONCERNING...TORNADO WATCH 238...241...

VALID 280409Z - 280445Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 238...241...CONTINUES.

A NEW TORNADO WATCH WILL BE NEEDED FOR PARTS OF THIS REGION GIVEN
THE EXPIRATION OF WW 241 AT 06Z.  LOCAL WFO EXTENSION OF WW 238 MAY
BE NEEDED AS THE STORM OVER SEVIER COUNTY TN REACHES FAR NERN TN
BETWEEN 05-0530Z.

THE LIKELIHOOD FOR DISCRETE SUPERCELLS PRODUCING TORNADOES CONTINUES
ACROSS THE VALID PORTIONS OF PDS /PARTICULARLY DANGEROUS SITUATION/
WATCHES 238 AND 241 LATE THIS EVENING INTO THE EARLY OVERNIGHT
PERIOD.  THIS INCLUDES ERN AL THROUGH CENTRAL AND NRN GA TO FAR ERN
TN...UPSTATE SC AND WRN NC.

LATE EVENING SURFACE ANALYSIS SHOWED AN AREA OF LOW PRESSURE OVER
CENTRAL INDIANA WITH A COLD FRONT TRAILING SWD THROUGH MIDDLE TN AND
NERN AL TO SERN MS.  REGIONAL RADAR IMAGERY INDICATED SEVERAL
DISCRETE SUPERCELLS ACROSS THE DISCUSSION AREA WITH THIS ACTIVITY
LOCATED ALONG AT LEAST TWO PRE-FRONTAL WIND SHIFTS/CONVERGENCE
ZONES.  THE WARM SECTOR REMAINS MODERATELY UNSTABLE FROM NRN GA SWD
AND MARGINALLY UNSTABLE ACROSS FAR WEST CENTRAL NC.  WRN EXTENT OF
STRONGER INSTABILITY IN LEE OF THE APPALACHIANS DOES EXIST OVER THE
NERN PART OF WW 241.  STRONG DEEP LAYER WIND FIELDS REMAIN
SUPPORTIVE OF SUPERCELLS WITH THE STRENGTH OF THE LLJ /55-70 KT/
FROM ERN AL/WRN GA TO ERN KY AND WV WILL MAINTAIN STRONG LOW LEVEL
SHEAR FOR LOW LEVEL ROTATION/TORNADIC THREAT.

..PETERS.. 04/28/2011

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

ATTN...WFO...RAH...RNK...CAE...GSP...MRX...FFC...TAE...BMX...
MOB...

LAT...LON   31608612 32698638 34388519 35228437 36588340 36568113
            35968038 34748166 33218330 31928449 31688537 31608612



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