Storm Prediction Center Mesoscale Discussion 30

   Mesoscale Discussion 0030
   NWS Storm Prediction Center Norman OK
   0419 AM CST Fri Jan 10 2025

   Areas affected...Parts of northeast MS...northern AL/GA...southern
   middle TN

   Concerning...Winter mixed precipitation 

   Valid 101019Z - 101515Z

   SUMMARY...An increase in winter precipitation rates is possible
   through the early morning.

   DISCUSSION...An extensive precipitation shield is gradually
   spreading eastward across the Southeast early this morning, in
   advance of a mid/upper-level shortwave trough approaching the lower
   MS Valley. Precipitation rates across northern AL/GA have thus far
   been limited by very dry antecedent conditions (as noted in the 00Z
   BMZ and FFC soundings), but saturation and evaporative cooling of
   the column will support an increase in winter precipitation across
   the region with time this morning. 

   The evolution of precipitation type remains uncertain through the
   morning, due to the competing influences of initial evaporative
   cooling, increasing warm advection above the surface, and
   maintenance of modest near-surface cold/dry advection from the
   east/northeast. Snow may persist as the dominant precipitation type
   from far northern AL into middle TN, with rates potentially
   approaching an inch per hour as large-scale ascent increases and the
   column saturates. 

   From north-central AL into northern GA, mixed precipitation appears
   more likely, with forecast soundings depicting near to slightly
   above-freezing temperatures from the surface to around 700 mb once
   saturation occurs. A general transition from snow/sleet to
   sleet/freezing rain/rain is possible across these areas. Moderate to
   locally heavy snow/sleet rates will be possible as the column
   initially saturates, while some ice accretion may eventually occur
   where subfreezing near-surface temperatures can persist as
   precipitation gradually transitions to a liquid phase.

   ..Dean.. 01/10/2025

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

   ATTN...WFO...GSP...MRX...FFC...OHX...BMX...HUN...MEG...JAN...

   LAT...LON   34618333 35118555 35288666 35458794 34838814 34708861
               34478934 34168929 33808899 33358820 33128717 33028501
               33038397 33238330 33528303 33828296 34618333