[BNAWX] Severe Storm Outlook Narrative

[EMWIN Server]

ACUS11 KWNS 150757
SWOMCD
SPC MCD 150757
GAZ000-SCZ000-NCZ000-TNZ000-ALZ000-150930-

MESOSCALE DISCUSSION 0413
NWS STORM PREDICTION CENTER NORMAN OK
0257 AM CDT SAT MAR 15 2008

AREAS AFFECTED...NRN GA...WRN SC

CONCERNING...SEVERE POTENTIAL...WATCH LIKELY

VALID 150757Z - 150930Z

AN ADDITIONAL WW WILL PROBABLY BECOME NECESSARY ACROSS THE REMAINDER
OF ALABAMA AND NORTHERN GEORGIA WITHIN THE NEXT HOUR OR SO.

ZONE OF ENHANCED LOWER/MID TROPOSPHERIC WARM ADVECTION...AND PERHAPS
A WEAK MID-LEVEL IMPULSE EMBEDDED WITHIN THE FAST WESTERLY FLOW
ACROSS THE GULF STATES...HAVE CONTRIBUTED TO THE EVOLUTION OF
ONGOING ORGANIZED CONVECTIVE CLUSTER.  ACTIVITY IS BASED IN AN
ELEVATED MOIST LAYER ABOVE A SHALLOW WARM FRONTAL INVERSION...BUT
MODERATE INSTABILITY BENEATH STEEP MID-LEVEL LAPSE RATES ARE
CONTRIBUTING TO VIGOROUS UPDRAFTS IN THE PRESENCE OF MODERATE TO
STRONG CLOUD BEARING LAYER SHEAR.  THIS ENVIRONMENT EXTENDS ACROSS
NORTHERN GEORGIA INTO THE LEE OF THE SOUTHERN APPALACHIANS...WHERE
IT APPEARS AREA OF STRONG FORCING/CONVECTIVE DEVELOPMENT WILL
DEVELOP BETWEEN NOW AND 12-13Z.  IN ADDITION TO THE RISK FOR LARGE
HAIL...EVAPORATIVE COOLING WITHIN RELATIVELY DRY MID-LEVEL AIR MASS
NEAR HEAVY PRECIPITATION CORES COULD CONTRIBUTE TO DOWNDRAFTS STRONG
ENOUGH TO PENETRATE SHALLOW SURFACE STABLE LAYER... ACCOMPANIED BY
LOCALIZED STRONG GUSTY WINDS.

..KERR.. 03/15/2008

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

ATTN...WFO...CAE...GSP...MRX...FFC...BMX...HUN...

34828565 35098505 35158401 35008339 34608268 33878232
33458239 33208324 33138454 33208524 33318573 33468586



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