Mesoscale Discussion 1894
   NWS Storm Prediction Center Norman OK
   0909 AM CST Thu Dec 31 2020

   Areas affected...portions of west Texas and far southwestern
   Oklahoma

   Concerning...Winter mixed precipitation 

   Valid 311509Z - 312115Z

   SUMMARY...Areas of winter mixed precipitation will result in
   appreciable icing over the next several hours across the discussion
   area.

   DISCUSSION...Isentropic lift and forcing aloft associated with a
   vigorous mid/upper low over far northeastern Mexico was contributing
   to a broad area of rain/snow mix across the discussion area as of
   1455Z.  The precipitation was occurring amidst cold surface
   temperatures around 32-33 F.  Surface dewpoints were in the 24-30F
   range, however, contributing to sub-zero wet-bulb temperatures.  As
   areas of moderate to occasionally heavy precipitation continue to
   lift northward, low-level profiles will cool locally and promote
   occasional freezing rain and/or sleet - especially along an axis
   from near San Angelo to near Wichita Falls/Vernon.  Accumulations of
   0.05 inch per hour of freezing rain are likely beneath heavier
   precipitation bands in these areas.  To the west of this axis, areas
   of moderate to occasionally heavy snow will be the greatest concern
   through the afternoon as most models/point forecast soundings
   indicate sub-freezing temperatures through the entire column.  Over
   time, occasional wintry mix of precipitation will drift northward
   and perhaps affect portions of southwestern Oklahoma later this
   afternoon.

   ..Cook.. 12/31/2020

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

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

   LAT...LON   34710006 34949921 34739795 34189774 33389829 32079935
               30770022 30460090 30520174 31070251 31780282 32540240
               34710006