MESOSCALE DISCUSSION 0092
   NWS STORM PREDICTION CENTER NORMAN OK
   0627 AM CST SUN JAN 21 2007
   
   AREAS AFFECTED...SRN OH...NERN KY...AND PARTS OF WV
   
   CONCERNING...WINTER MIXED PRECIPITATION 
   
   VALID 211227Z - 211730Z
   
   A RANGE OF WINTER PRECIPITATION TYPES WILL SPREAD ACROSS PARTS OF
   THE CUMBERLAND PLATEAU AND UPPER OH VALLEY THROUGH EARLY AFTERNOON.
   NRN PORTIONS OF THE DISCUSSION AREA...FROM SWRN OH ACROSS MUCH OF
   CNTRL WV WILL EXPERIENCE SNOW...POSSIBLY CHANGING TO FREEZING RAIN
   IN SOME AREAS BY LATER THIS MORNING. SRN PARTS OF THE AREA...ALONG
   THE OH RIVER...NERN KY...AND SRN WV WILL EXPERIENCE A PERIOD OF
   FREEZING RAIN...PERHAPS MIXED WITH ICE PELLETS AT TIMES.
   
   STRONG WARM/MOIST CONVEYOR BELT CONTINUES TO IMPINGE UPON ENTRENCHED
   SURFACE-BASED COLD DOME FROM THE UPPER OH VALLEY TO THE WRN SLOPES
   OF THE APPALACHIANS THIS MORNING. GRADUAL SATURATION OF DRY LOW
   LEVEL AIR MASS...AND RESULTANT EVAPORATIVE COOLING FROM SWRN OH INTO
   WV...WILL SUPPORT SNOW ACROSS THESE AREAS THROUGH THE MORNING.
   LATEST MODEL GUIDANCE SUGGESTS MAXIMUM SNOWFALL RATES OF AROUND 0.5
   TO 1 INCH PER HOUR COULD OCCUR NORTH OF A CVG-CRW-BKW LINE THROUGH
   ABOUT 18Z.
   
   INCREASINGLY STRONG LOW LEVEL JET DEVELOPING NEWD FROM THE TN AND
   LOWER OH VALLEYS WILL ADVECT A WARMER LAYER OF AIR NEWD ATOP THE 
   SURFACE-BASED SUB-FREEZING AIRMASS FROM NERN KY INTO SRN WV.
   PRECIPITATION IN THESE AREAS IS LIKELY TO FALL IN THE FORM OF
   FREEZING RAIN...PERHAPS MIXED WITH SLEET AT TIMES. UPSTREAM HOURLY
   PRECIPITATION AMOUNTS WOULD SUPPORT GLAZE ACCUMULATIONS OF AS MUCH
   AS 0.10 INCH PER HOUR IN SOME AREAS OVER THE NEXT FEW HOURS.
   
   ..CARBIN.. 01/21/2007
   
   
   ...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...RNK...RLX...JKL...ILN...LMK...
   
   37538236 37838282 37968359 38028463 38478520 39668440
   39808281 39418165 39208102 38638029 38258006 37628048
   37118079 37038129 37198191