MESOSCALE DISCUSSION 0017
   NWS STORM PREDICTION CENTER NORMAN OK
   0453 AM CST TUE JAN 06 2009
   
   AREAS AFFECTED...PARTS OF CNTRL/SRN IND AND OH...EXTREME NRN KY
   
   CONCERNING...FREEZING RAIN 
   
   VALID 061053Z - 061330Z
   
   FREEZING RAIN IS DEVELOPING ACROSS THE REGION...AND HAZARDS
   ASSOCIATED WITH ICING COULD PERSIST INTO MID/LATE MORNING.
   
   HIGHER MOISTURE CONTENT AIR WILL LIKELY REMAIN CUT-OFF FROM AREAS
   NORTH OF THE OHIO RIVER...FOCUSED JUST NORTH OF THE SURFACE FRONTAL
   ZONE...ALONG THE SOUTHERN FRINGE OF A BROAD ANTICYCLONIC UPPER
   JET...TO THE SOUTHEAST.  BUT...LARGE-SCALE ASCENT...ASSOCIATED  WITH
   A SHORT WAVE IMPULSE EMANATING FROM THE UPPER TROUGH OVER THE
   SOUTHERN PLAINS...IS GRADUALLY CONTRIBUTING TO DEEP LAYER SATURATION
   THROUGH MUCH OF THE OHIO VALLEY.  THIS IS OCCURRING COINCIDENT WITH
   LOW-LEVEL WARMING/MOISTENING ABOVE A RESIDUAL SUB-FREEZING BOUNDARY
   LAYER...WHICH PROBABLY WILL BE SUFFICIENT TO SUPPORT A PERIOD OF
   FREEZING RAIN...OR CHANGE-OVER FROM SNOW/SLEET TO FREEZING
   RAIN...BETWEEN NOW AND 14-16Z.  
   
   PRECIPITATION IS EXPECTED TO BE MOSTLY LIGHT IN NATURE. 
   HOWEVER...MODELS SUGGEST THAT RATES COULD OCCASIONALLY EXCEED .10
   INCH LIQUID WATER EQUIVALENT PER HOUR...BEFORE FORCING WEAKENS AS
   UPPER IMPULSE BECOMES INCREASINGLY SHEARED WITHIN A CONFLUENT
   MID/UPPER FLOW REGIME ACROSS THE OHIO VALLEY.  THIS COULD CONTRIBUTE
   TO APPRECIABLE GLAZING OF EXPOSED OBJECTS AND MANY ROAD SURFACES...
   PARTICULARLY NEAR/EAST OF INDIANAPOLIS AND CINCINNATI THROUGH AREAS
   ALONG/SOUTH OF THE INTERSTATE 70 CORRIDOR OF OHIO.
   
   ..KERR.. 01/06/2009
   
   
   ...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...PBZ...RLX...CLE...ILN...LMK...IWX...IND...
   
   LAT...LON   40008607 40358559 40588453 40718250 40618102 39978081
               38958172 38548274 38658398 38608523 39268592 39528597
               40008607