MESOSCALE DISCUSSION 2563
   NWS STORM PREDICTION CENTER NORMAN OK
   1201 PM CST WED DEC 22 2004
   
   AREAS AFFECTED...N-CENTRAL/NRN KY...SERN IND...OH EXCEPT FAR
   NW...NWRN PA...AND FAR WRN NY
   
   CONCERNING...PRECIPITATION TRENDS...WINTER PRECIPITATION 
   
   VALID 221801Z - 222300Z
   
   BAND OF HEAVY SNOW...WITH RATES OF 1"/HR LIKELY...WILL TRANSLATE
   NEWD ALONG AN AXIS FROM SDF TO CMH TO FAR NWRN PA/FAR WRN NY BETWEEN
   18-00Z. NARROW TRANSITION ZONE WITH FREEZING RAIN WILL EXIST FROM
   N-CENTRAL KY NEWD INTO SRN OH...WITH SNOW/FREEZING RAIN TRANSITION
   ZONE GRADUALLY PROPAGATING SEWD THROUGH THE REMAINDER OF THIS
   AFTERNOON. 
   
   AT 1730Z...LEADING SHORTWAVE TROUGH CONTINUES TO TRACK NEWD ACROSS
   WRN KY ALONG THE STRONG MID-LEVEL BAROCLINIC ZONE LOCATED NEAR THE
   OHIO RIVER. ELONGATED BAND OF PRECIPITATION...FORCED BY DEEP-LAYER
   FRONTOGENESIS...EXTENDS FROM NWRN KY TO FAR WRN NY. FORCING WILL BE
   AUGMENTED BY SHORTWAVE TROUGH/ISENTROPIC ASCENT...WITH 35+ DBZ SNOW
   LIKELY AT TIMES THIS AFTERNOON ACROSS CENTRAL OH AS SYNOPTIC ASCENT
   INCREASES FROM THE SW. THIS WILL YIELD NARROW ZONES OF 1"/HR
   SNOWFALL...LIKELY INVOLVING THE CVG AND CMH METRO AREAS BETWEEN
   18-21Z AND MOVING INTO NERN OH NEAR AND SE OF CLE/NWRN PA/FAR WRN NY
   BETWEEN 20-00Z. 
   
   DISTINCT BRIGHT BANDING 35 NE HOP TO 15SE SDF SEPARATES SNOW TO THE
   NORTHWEST FROM NARROW RIBBON /10-20NM WIDE/ OF FREEZING RAIN.
   LOW-LEVEL COLD ADVECTION AS SURFACE RIDGING BUILDS IN BEHIND FRONTAL
   SYSTEM SHOULD GRADUALLY ALLOW FOR LOW-LEVEL COOLING AND A SLOW SEWD
   PROPAGATION OF RAIN/SNOW LINE ACROSS N-CENTRAL KY INTO S-CENTRAL/SRN
   OH DURING THE NEXT SEVERAL HOURS.
   
   ..BANACOS.. 12/22/2004
   
   
   ...NOTICE...
   SPC WINTER WEATHER MESOSCALE DISCUSSIONS WILL BE ISSUED ON A 
   SCHEDULED BASIS...FOUR TIMES A DAY...BETWEEN 00-01 UTC...
   06-07 UTC...12-13 UTC...AND 18-19 UTC AS SIGNIFICANT SHORT
   RANGE WINTER WEATHER EVENTS UNFOLD.  THIS SCHEDULE WILL BE
   USED FROM DECEMBER 1 THROUGH FEBRUARY 28.
   
   ATTN...WFO...BUF...CTP...PBZ...RLX...CLE...JKL...ILN...LMK...IND...
   
   38708653 39408566 41428213 42997897 43067814 42237885
   40838031 39208183 38258391 37168590 36988664 38738653