[BNAWX] Severe Storm Outlook Narrative

[EMWIN Server]

ACUS11 KWNS 241641
SWOMCD
SPC MCD 241640
GAZ000-KYZ000-TNZ000-ALZ000-INZ000-241815-

MESOSCALE DISCUSSION 0375
NWS STORM PREDICTION CENTER NORMAN OK
1140 AM CDT SAT APR 24 2010

AREAS AFFECTED...AL...WRN GA...MIDDLE TN...CNTRL KY...SCNTRL IND

CONCERNING...SEVERE POTENTIAL...TORNADO WATCH LIKELY

VALID 241640Z - 241815Z

TORNADO WATCHES 92/93 WILL BE REPLACED AND/OR EXPANDED /BY 18Z/ TO
COVER MOST...IF NOT ALL...OF THE REGION THROUGH THE EVENING HOURS.
COMPLEX SCENARIO HAS UNFOLDED OVER THE REGION AND WILL RESULT IN
MULTIPLE REGIONS OF ENHANCED SVR RISKS.

...CNTRL/SRN AL-NRN/CNTRL GA...
MORNING ACTIVITY...ENHANCED BY A LEAD MID-LVL WAVE...WILL LIKELY
CONTINUE TO THRIVE AS LARGER-SCALE ASCENT AHEAD OF THE PRIMARY UPR
IMPULSE SPREADS ENE.  THIS WILL MAINTAIN A ZONE OF HIGHER SVR
PROBABILITIES ACROSS CNTRL/SRN AL INTO WCNTRL/NWRN GA FOR SVRL MORE
HOURS.  EXTREME LLVL SHEAR IN PLACE...LOW-LCLS AND LARGELY DISCRETE
STORM MODES WILL MAINTAIN RISKS FOR STRONG TORNADOES.

...CNTRL KY TO SCNTRL IND...
MCV WAS EVIDENT OVER MIDDLE TN WITH STRONG WAA DRIVING PRIMARILY
ELEVATED STORMS FROM THE LWR OH VLY INTO MIDDLE TN...TRANSITIONING
TO SFC-BASED SUPERCELLS ALONG THE WRN TN/NRN MS BORDER.  STORMS WILL
CONTINUE TO DEVELOP ENE INTO CNTRL KY AND SCNTRL IND LATER THIS AFTN
WHERE AIR MASS WILL UNDERGO RAPID DESTABILIZATION.  WHILE INITIAL
STORMS WILL BE MOSTLY A LARGE HAIL THREAT...AS LOW-LEVELS CONTINUE
TO MOISTEN AND LARGE SCALE ASCENT INCREASES...MORE ROBUST SFC-BASED
STORMS WILL BE LIKELY WITH AN INCREASE IN TORNADO/LARGE HAIL
THREATS.

...NRN AL AND MIDDLE TN...
THE BRIEF LULL IN SVR THREAT LATE THIS MORNING WILL CHANGE THIS AFTN
AS LARGE SCALE ASCENT OVERSPREADS THE DESTABILIZING WARM SECTOR IN
PLACE.  STORMS WERE ALREADY RAPIDLY FORMING OVER NERN MS AND THESE
ARE EXPECTED TO MOVE/DEVELOP INTO NRN AL/MIDDLE TN EARLY-MID AFTN AS
DISCRETE STORMS.  STRONG TORNADOES WILL BE POSSIBLE ALONG WITH VERY
LARGE HAIL GIVEN 0-1KM SRH IN EXCESS OF 450 M2/S2.

..RACY.. 04/24/2010

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

ATTN...WFO...MRX...JKL...FFC...ILN...LMK...OHX...IND...BMX...
HUN...MOB...PAH...

LAT...LON   31288809 34598745 36828715 38688660 38448457 35378479
            33798471 32088523 31768560 31288809

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