MESOSCALE DISCUSSION 2193
   NWS STORM PREDICTION CENTER NORMAN OK
   0948 AM CST SUN DEC 09 2007
   
   AREAS AFFECTED...NERN OK NEWD ACROSS EXTREME SERN KS/SWRN
   
   CONCERNING...WINTER MIXED PRECIPITATION 
   
   VALID 091548Z - 091815Z
   
   THUNDERSTORMS WITH PERIODS OF MODERATE SLEET AND SOME FREEZING RAIN
   WILL SPREAD RAPIDLY NEWD ACROSS NERN OK AND INTO EXTREME SERN
   KS/SWRN MO THROUGH 18Z.
   
   STRONG WARM ADVECTION BETWEEN 700-850 MB AND MUCAPES BETWEEN
   500-1000 J/KG WILL REMAIN FAVORABLE FOR THUNDERSTORMS TO SPREAD
   NEWD...ABOVE THE COLD BOUNDARY LAYER/TEMPERATURES BETWEEN 25-30F.
   ALTHOUGH OTHER MORE SCATTERED CONVECTION WILL OCCUR AROUND THIS MAIN
   THREAT AREA...ASSOCIATED 500 MB SHORTWAVE TROUGH AND STRONGER
   DIVERGENCE ALOFT WILL BE FAVORABLE FOR WIDESPREAD CONVECTION ACROSS
   NERN OK/SERN KS AND SWRN MO THROUGH 18Z. THE DEPTH OF COLD BOUNDARY
   LAYER SUGGESTS THAT SLEET WILL BE THE MAIN THREAT...THOUGH SOME
   FREEZING RAIN MAY MIX IN...ESPECIALLY FROM SW OF TUL TO JLN...WHERE
   BELOW FREEZING TEMPERATURES ARE NOT AS DEEP AS AREAS TO THE WEST AND
   NORTH.
   
   ..IMY.. 12/09/2007
   
   
   ...NOTICE...
   SPC WINTER WEATHER MESOSCALE DISCUSSIONS WILL BE ISSUED ON A
   SCHEDULED BASIS FROM DECEMBER 1 THROUGH FEBRUARY 28...FOUR
   TIMES A DAY...AROUND 00 UTC...06 UTC...12 UTC...AND 18 UTC
   FOR SIGNIFICANT SHORT RANGE WINTER WEATHER EVENTS.
   
   ATTN...WFO...SGF...TSA...ICT...OUN...
   
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