[MCD] SWOMCD

Thu Nov 30 23:25:32 UTC 2006

ACUS11 KWNS 302327
SWOMCD
SPC MCD 302327 
ILZ000-MOZ000-010400-

MESOSCALE DISCUSSION 2251
NWS STORM PREDICTION CENTER NORMAN OK
0527 PM CST THU NOV 30 2006

AREAS AFFECTED...EAST CENTRAL MO/WEST CENTRAL IL

CONCERNING...WINTER MIXED PRECIPITATION 

VALID 302327Z - 010400Z

FREEZING RAIN AND MODERATE/HEAVY SLEET WILL REMAIN PREVALENT ACROSS
EAST CENTRAL MO/WEST CENTRAL IL THROUGH MID/LATE EVENING...INCLUDING
THE ST LOUIS METRO AREA AND PORTIONS OF I-70/I-44/I-55...WITH
ADDITIONAL ICE ACCUMULATIONS VIA LIQUID EQUIVALENTS OF 0.10 IN/HR
AND GREATER.

WARM CONVEYOR/MOISTURE TRANSPORT REGIME AHEAD OF CYCLONE CURRENTLY
CENTERED OVER EASTERN OK WILL CONTINUE TO MAINTAIN AN ELEVATED
ABOVE-FREEZING LAYER INTO EAST CENTRAL MO/WEST CENTRAL IL THIS
EVENING. THIS IS GENERALLY REPRESENTED BETWEEN 700-850 MB IN RUC
POINT SOUNDINGS...SUFFICIENT FOR FULL/PARTIAL MELTING ABOVE A
SHALLOW 1-KM SUB-FREEZING LAYER WITH SURFACE TEMPERATURES IN THE
20S. THIS OVERALL SCENARIO IS EXPECTED TO FLUCTUATE LITTLE THIS
EVENING...UNTIL THE ARRIVAL OF THE CLOSED LOW/COLDER AIR LATER
TONIGHT. WITH CONVECTIVELY ENHANCED ELEMENTS AND DEEP LAYER FORCING
FOR ASCENT OVERSPREADING THE REGION...A MIX OF FREEZING RAIN/SLEET
WILL REMAIN COMMON THROUGH MID/LATE EVENING IN EAST CENTRAL MO AREAS
INCLUDING I-70/I-44 AND COLUMBIA/JEFFERSON CITY/ROLLA/ST LOUIS...AND
WEST CENTRAL IL LOCALES INCLUDING QUINCY AND SPRINGFIELD/I-55.

..GUYER.. 11/30/2006

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

ATTN...WFO...ILX...LSX...DVN...SGF...

39349200 39939147 40668982 40278908 39748913 38438978
37419065 37319100 37099169 37469228 38579232 