MESO: Mesoscale Discussion 0531

ACUS11 KWNS 200028
SWOMCD
SPC MCD 200027
ALZ000-200130-

MESOSCALE DISCUSSION 0531
NWS STORM PREDICTION CENTER NORMAN OK
0727 PM CDT SUN APR 19 2009

AREAS AFFECTED...NRN AL AND SRN MIDDLE TN

CONCERNING...SEVERE THUNDERSTORM WATCH 174...

VALID 200027Z - 200130Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 174
CONTINUES.

PRIMARY SEVERE THREAT IS EXPECTED TO REMAIN OVER SERN PARTS OF WW
174.

STORMS THAT DEVELOPED WITHIN PRE-FRONTAL CONVERGENCE ZONE CONTINUE
EWD THROUGH NRN AL FROM NEAR HUNTSVILLE SWWD TO NEAR FAYETTE. THESE
STORMS REMAIN ON THE NOSE OF A 45-50 KT SLY LOW LEVEL JET THAT WILL
MAINTAIN STRONG STORM RELATIVE INFLOW AND HELP SUSTAIN ACTIVITY NEXT
COUPLE HOURS. HOWEVER...STORMS WILL BEGIN TO APPROACH ERN EDGE OF
INSTABILITY AXIS AS THEY CONTINUE EAST TOWARD NW GA. ISOLATED LARGE
HAIL...DAMAGING WIND AND PERHAPS A TORNADO OR TWO WILL REMAIN
POSSIBLE THROUGH THE EARLY EVENING.

SEVERE THREAT APPEARS MORE MARGINAL ACROSS REMAINING PARTS OF WW 174
INCLUDING SRN MIDDLE TN WHERE RADAR DATA SHOWS A BAND OF WEAK
CONVECTION THAT HAS DEVELOPED WITHIN ZONE OF MID-LEVEL ASCENT AHEAD
OF EWD ADVANCING VORT MAX. WEAK INSTABILITY WILL LIKELY REMAIN THE
PRIMARY LIMITING FACTOR IN THIS REGION.

..DIAL.. 04/20/2009

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

ATTN...WFO...BMX...HUN...

LAT...LON 34458560 33668684 33828760 34878673 34458560

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