SPC MD 54

MD 0054 CONCERNING WINTER MIXED PRECIPITATION FOR PORTIONS OF SOUTHERN GEORGIA INTO NORTHERN FLORIDA

Mesoscale Discussion 0054
NWS Storm Prediction Center Norman OK
1052 PM CST Tue Jan 21 2025

Areas affected...portions of southern Georgia into northern Florida

Concerning...Winter mixed precipitation 

Valid 220452Z - 220745Z

SUMMARY...A wintry mix should continue into the early morning hours,
with instances of moderate snow, sleet, and perhaps freezing rain
expected.

DISCUSSION...A belt of strong 700 mb warm-air and moisture advection
is overspreading southern GA into northern FL in response to a
rapidly approaching mid-level trough. While RAP forecast soundings
suggest that much of the vertical profile below 600 mb may be above
freezing at several locales, 04Z mesoanalysis shows strong
surface-850 mb CAA impinging on the GA/FL border, where MRMS mosaic
radar data shows bright banding taking place, and where surface
observations indicate snow, sleet, and freezing rain becoming the
predominant precipitation modes. Continued CAA should result in
wintry mixed precipitation overspreading the rest of far northern FL
and continuing into the early morning hours, in agreement with the
latest high-resolution guidance consensus.

..Squitieri.. 01/22/2025

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

ATTN...WFO...CHS...TBW...JAX...FFC...TAE...

LAT...LON   30098570 31238420 32128278 32368214 32338142 32108105
            31578124 30628151 30258180 29858245 29578288 29478315
            29518334 29828369 30018395 29908428 29718461 29608484
            29588509 29668539 30098570 

SPC MD 53

MD 0053 CONCERNING HEAVY SNOW FOR CENTRAL AND EASTERN PORTIONS OF THE CAROLINAS
        

Mesoscale Discussion 0053
NWS Storm Prediction Center Norman OK
0801 PM CST Tue Jan 21 2025

Areas affected...central and eastern portions of the Carolinas

Concerning...Heavy snow 

Valid 220201Z - 220700Z

SUMMARY...Moderate to heavy snow should gradually become widespread
through early tonight across portions of the central and eastern
Carolinas.

DISCUSSION...700 mb warm-air and moisture advection are increasing
over central and eastern parts of the Carolinas with the approach of
a pronounced 500 mb trough that is traversing the central
Appalachians. Beneath the 700 mb moistening, strong surface-850 mb
cold-air advection is contributing to further saturation and
sensible cooling of the column to support a predominance of snow,
which is currently being indicated by surface observations on a
widespread basis. Ahead of the upper trough, 700 mb frontogenesis is
intensifying, which should support increased snowfall rates. As
such, in addition to the transition to snow, 0.5-1.0 inch/hour
snowfall rates may develop over the next couple of hours, as also
suggested by some of the latest high-resolution guidance runs.

..Squitieri.. 01/22/2025

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

ATTN...WFO...AKQ...MHX...RAH...ILM...CHS...CAE...GSP...

LAT...LON   31968072 32388112 33088159 33798169 34438124 35427983
            35787825 36017695 36227604 35877554 35337562 34927650
            34557721 34057805 33607881 32857959 32288042 31968072 


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