SWOMCD
SPC MCD 211856
ALZ000-MSZ000-ARZ000-LAZ000-212100-
MESOSCALE DISCUSSION 2024
NWS STORM PREDICTION CENTER NORMAN OK
0156 PM CDT MON SEP 21 2009
AREAS AFFECTED...PARTS OF MS AND INTO W CENTRAL AL
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 211856Z - 212100Z
WHILE A LOW-END POTENTIAL FOR SEVERE WEATHER REMAINS APPARENT ACROSS
THIS AREA...WW WILL LIKELY REMAIN UNNECESSARY.
A MOIST BOUNDARY LAYER AND MODERATE INSTABILITY IS INDICATED ACROSS
MUCH OF MS AND INTO THE SRN 2/3 OF AL ATTM...SOUTH OF A
WEAK/CONVECTIVELY REINFORCED WARM FRONT EXTENDING WNW-ESE ACROSS
CENTRAL MS. SCATTERED SHOWERS AND THUNDERSTORMS CONTINUE ACROSS MS
INVOF THIS BOUNDARY...AHEAD OF A NEWD-MOVING CIRCULATION ALOFT NOW
OVER WRN TN. WHILE CONVECTION WILL LIKELY CONTINUE -- PARTICULARLY
NEAR AND N OF THE SURFACE BOUNDARY...DEEP-LAYER WIND FIELD REMAINS
MODEST ACROSS THIS REGION. WITH SURFACE WINDS BACKED/ESELY N OF THE
FRONT...SOME ENHANCEMENT TO BOTH LOW-LEVEL AND DEEP-LAYER SHEAR IS
INDICATED -- WHICH IS SUPPORTING WEAK ROTATION WITHIN A FEW STRONGER
CELLS. THIS SHOULD CONTINUE -- WITH MARGINAL HAIL/WIND OR EVEN AN
ISOLATED TORNADO THUS POSSIBLE. OVERALL THREAT SHOULD REMAIN
ISOLATED/MARGINAL...AND THUS WW STILL APPEARS UNNECESSARY.
..GOSS.. 09/21/2009
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...BMX...MOB...MEG...JAN...LZK...
LAT...LON 33608883 32728752 31578786 31568897 32779107 34009120
34719038 33608883
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