Mesoscale Discussion 1898
   NWS Storm Prediction Center Norman OK
   0259 PM CST Thu Dec 31 2020

   Areas affected...portions of west Texas northeastward through much
   of western/central Oklahoma

   Concerning...Winter mixed precipitation 

   Valid 312059Z - 010100Z

   SUMMARY...Mixed winter precip continues across portions of
   west-central Texas and will spread north/northwestward into
   central/southwestern Oklahoma this afternoon.

   DISCUSSION...Recent observations and radar mosaic imagery indicate a
   broad area of mixed winter precipitation (rain, freezing rain, and
   sleet) extending from near San Angelo to Wichita Falls/Vernon. 
   Portions of the region nearer the Red River (near Wichita
   Falls/Vernon) got above freezing before the onset of precipitation,
   however, though dry low-levels and wet-bulb cooling as precipitation
   spreads northward into that area will likely result in a change over
   to freezing rain/sleet in the next couple hours or so.  Recent
   models indicate that this regime should persist into this afternoon
   as an upper low (not over south Texas) moves northward and continues
   to provide lift/ascent.  Accumulations of 0.06 inch were noted in
   the last hour near Abilene, Texas, and these accumulations are
   possible at times across western North Texas as surface temperatures
   cool.

   Farther northeast, another band of precipitation was advancing
   northwestward across the Duncan/Pauls Valley/Ada areas where
   temperatures are currently near 32F.  The low-level airmass just
   north of this band has remained cool/dry and near freezing, and the
   advancement of precipitation atop this airmass will allow for
   cooling surface temperatures and the onset of freezing rain and/or
   sleet.  Accumulations of 0.06 in or more over the next 3 hours
   appear probable.

   ..Cook.. 12/31/2020

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

   ATTN...WFO...TSA...FWD...OUN...SJT...LUB...MAF...

   LAT...LON   32630106 33640072 34779993 36029866 36639795 36789736
               36669678 35849621 35159635 34769675 34389765 33889861
               32929907 32189920 31699977 31650045 32130097 32630106