Mesoscale Discussion 0127
   NWS Storm Prediction Center Norman OK
   0950 PM CST Thu Feb 03 2022

   Areas affected...Southern Ohio into western Pennsylvania

   Concerning...Winter mixed precipitation 

   Valid 040350Z - 040745Z

   SUMMARY...Moderate to heavy wintry mix will continue well into the
   overnight hours within a narrow swath from southern Ohio into
   western Pennsylvania as precipitation continues to move into the
   region.

   DISCUSSION...Regional radar mosaics continue to show widespread
   precipitation stretching from the OH River Valley into New England,
   driven mainly by persistent warm advection between 850-700 mb and
   weak frontogenesis within this layer. The surface freezing line has
   slowly shifted south over the past 4 hours, but the baroclinic zone
   aloft has largely remained in place and has maintained a somewhat
   narrow transition zone of wintry mix. Recent LSRs show 1-2 inches of
   sleet accumulation and 0.1-0.25 inches of freezing rain accumulation
   over the past few hours within this zone. The 00Z ILN sounding
   revealed a 3-4 kft isothermal layer near the 0 C isotherm, and this
   feature is still identifiable in recent CC imagery from KPIT and
   KILN as a melting layer of similar depth. Moderate to heavy
   precipitation (as suggested by MRMS rainfall rate estimates on the
   order of 0.1-0.2 inches/hour) will continue to move through the
   region over the next few hours with the potential for impactful
   sleet/freezing rain accumulations. At least light precipitation will
   likely continue until the baroclinic zone aloft transitions east
   with the main synoptic wave later tonight/early Friday.

   ..Moore.. 02/04/2022

   ...Please see www.spc.noaa.gov for graphic product...

   ATTN...WFO...CTP...PBZ...RLX...CLE...JKL...ILN...LMK...

   LAT...LON   38718438 39368425 39978292 40578155 40948004 41327880
               41197820 40767803 40577906 40028007 39648078 38928171
               38598246 38328391 38718438