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