MESOSCALE DISCUSSION 2493
   NWS STORM PREDICTION CENTER NORMAN OK
   0550 PM CST TUE NOV 30 2004
   
   AREAS AFFECTED...SERN WI/NRN IL/NRN IN/LOWER PENINSULA OF MI
   
   CONCERNING...PRECIPITATION TRENDS...WINTER PRECIPITATION 
   
   VALID 302350Z - 010545Z
   
   RAIN WILL BE CHANGING TO SNOW ACROSS PORTIONS OF NRN IL/NRN IN AND
   THE LOWER PENINSULA THROUGH MID EVENING. SNOWFALL RATES MAY INCREASE
   TO 1 IN/HOUR IN THE 03-06Z TIMEFRAME...ESPECIALLY AFTER 06Z.
   
   LATEST MESOANALYSIS SHOWS SFC LOW NEAR EVANSVILLE WITH BROAD UPPER
   TROUGH EXTENDING FROM CNTRL IA/ERN KS/SW OK PER LATEST WV IMAGERY
   AND VWP/PROFILER DATA. AS THIS SYSTEM MOVES EAST INTO THE OH VALLEY
   OVERNIGHT...SFC LOW WILL DEEPEN IN RESPONSE TO STRONG LARGE SCALE
   HEIGHT FALLS AS IT MOVES NEWD NEAR TOLEDO BY 01/06Z. SFC
   TEMPERATURES ACROSS MOST OF THE DISCUSSION AREA RANGE FROM THE MID
   TO UPPER 30S WITH THE SFC FREEZING LINE FROM MLI/JVL. 
   HOWEVER...SNOW IS BEING REPORTED FROM UIN TO VYS/ARR WHERE A
   CHANGEOVER TO FROZEN PRECIP IS OCCURRING ATTM.
   
   POINT FORECAST SOUNDINGS SUGGEST TEMPERATURES ALOFT ARE COLD ENOUGH
   FOR SNOW TO DEVELOP WITHIN THE NEXT 1-3 HOURS ACROSS NCNTRL IL
   SPREADING INTO THE WRN SUBURBS OF CHICAGO BY 03Z. ALTHOUGH LIGHT TO
   MODERATE SNOW WILL FALL ACROSS PORTIONS OF N/NERN IL THIS
   EVENING...THE HEAVIEST SNOW LIKELY WILL NOT DEVELOP UNTIL AFTER
   06Z...AS THE MAIN SNOW BANDS SPREAD INTO NRN IN AND EVENTUALLY THE
   SRN LOWER PENINSULA.
   
   ..TAYLOR.. 11/30/2004
   
   
   ...NOTICE...
   SPC WINTER WEATHER MESOSCALE DISCUSSIONS WILL BE ISSUED ON A 
   SCHEDULED BASIS...FOUR TIMES A DAY...BETWEEN 05-06 UTC...
   11-12 UTC...17-18 UTC...AND 23-00 UTC AS SIGNIFICANT SHORT
   RANGE WINTER WEATHER EVENTS UNFOLD.  THIS SCHEDULE WILL BE
   USED FROM DECEMBER 1 THROUGH FEBRUARY 28 TO ALLOW PARTNERS
   AND USERS TO BETTER ANTICIPATE THE TIMING OF SPC WINTER WEATHER
   MESOSCALE DISCUSSIONS.
   
   ATTN...WFO...DTX...APX...IWX...GRR...IND...LOT...ILX...MKX...DVN...
   
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