[MCD] SWOMCD

Fri Dec 1 05:48:29 UTC 2006

ACUS11 KWNS 010550
SWOMCD
SPC MCD 010550 
ILZ000-WIZ000-MOZ000-IAZ000-KSZ000-OKZ000-011015-

MESOSCALE DISCUSSION 2254
NWS STORM PREDICTION CENTER NORMAN OK
1150 PM CST THU NOV 30 2006

AREAS AFFECTED...EXTREME SERN KS...MUCH OF NRN/CNTRL
MO...NRN/W-CNTRL IL...EXTREME SERN IA

CONCERNING...HEAVY SNOW 

VALID 010550Z - 011015Z

MODERATE TO HEAVY SNOW WITH LOCAL RATES UP TO 3 IN/HR WILL SPREAD
NEWD FROM SERN KS/NERN OK/WRN MO ACROSS NERN MO INTO W-CNTRL AND NRN
IL BY 12Z. AS THE SURFACE LOW ACROSS FAR WRN KY LIFTS NORTH AND
DEEPENS...GRADIENT WINDS WILL INCREASE...AIDING IN BLOWING/DRIFTING
SNOW AS WELL.

POWERFUL UPPER LOW CENTERED AT 500 MB NEAR FAYETTEVILLE AR WILL
TRACK NEWD TO NEAR SPRINGFIELD IL BY 12Z. DEFORMATION BAND OF
MODERATE TO HEAVY SNOW WILL CONTINUE TO THE NW OF MID-LEVEL DRY
SLOT...PARALLEL TO TRACK OF UPPER LOW. 00Z/RUC AND 03Z/NAM FORECAST
SOUNDINGS INDICATE LARGE DENDRITIC GROWTH ZONES /IN EXCESS OF 100
MB/ WILL OCCUR ACROSS MUCH OF CNTRL MO FROM AROUND 50 N OF SGF TO
COU TO UIN THROUGH 10Z. ISOLATED CG STRIKES HAVE OCCURRED WITHIN
THIS ZONE...LIKELY SUPPORTING VERY HEAVY BURSTS OF SNOWFALL AT TIMES
FROM 2 TO 3 IN/HR.

FURTHER NE...VERY STRONG UPPER-LEVEL DIVERGENCE/DIFFLUENCE WILL
OCCUR TO THE N/NW OF A 100+ KT 500 MB JET CURLING E/SE OF UPPER LOW.
A MIX OF SLEET/FREEZING RAIN/SNOW ACROSS MUCH OF WRN/NRN IL WILL
GRADUALLY TURN TO ALL SNOW FROM W TO E AS LOW-LEVEL TEMPS SLOWLY
COOL WITH TIME. SNOWFALL RATES OF 1 TO 2 IN/HR WILL BE LIKELY IN THE
09-12Z TIME FRAME FROM THE NRN STL METRO/UIN AREA NEWD TOWARDS PIA
AND THE WRN CHICAGO METRO AREA.

..GRAMS.. 12/01/2006

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

ATTN...WFO...LOT...ILX...MKX...LSX...DVN...SGF...EAX...TSA...TOP...ICT...

38619053 37489215 36869405 36849542 37989516 39539357
40909171 41839019 42208951 42558832 41648761 40868811
40068899 

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