Storm Prediction Center Mesoscale Discussion 89

   Mesoscale Discussion 0089
   NWS Storm Prediction Center Norman OK
   0229 PM CST Wed Feb 12 2025

   Areas affected...Eastern Indiana into northwest Ohio

   Concerning...Winter mixed precipitation 

   Valid 122029Z - 130030Z

   SUMMARY...A mix of sleet and freezing rain is expected to overspread
   eastern Indiana and northwest Ohio over the next several hours.
   Freezing rain rates up to 0.03-0.05 inch/hour are possible.

   DISCUSSION...Precipitation associated with the warm advection branch
   of a deepening mid-level wave is beginning to overspread parts of
   central to eastern IN and southwest OH where surface temperatures
   remain near or below freezing. Recent upper-air analysis and
   forecast soundings show a weak warm layer aloft at around 850 mb
   atop of sub-freezing surface temperatures that should support some
   melting/re-freezing of hydrometeors. The weak warm nose will likely
   initially support a mix of sleet and freezing rain within a narrow
   swath from eastern IN into west/northwest OH where there is
   favorable overlap of sub-freezing surface temperatures and warm
   temperatures aloft. With time, continued warming near the 850 mb
   level should promote a gradual transition to primarily freezing rain
   through late afternoon/early evening. Freezing rain rates between
   0.02 to 0.05 in/hour appear probable based on recent high-res
   guidance that has captured surface temperature trends well.

   ..Moore.. 02/12/2025

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

   ATTN...WFO...CLE...ILN...IWX...IND...

   LAT...LON   40958148 40708156 40588177 40518214 40398297 40268354
               40108408 39918451 39808490 39798545 39888585 40048604
               40408605 40808569 41268487 41428415 41508361 41478294
               41428237 41318194 41118162 40958148