Storm Prediction Center Mesoscale Discussion 51
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Mesoscale Discussion 51 | |
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Mesoscale Discussion 0051 NWS Storm Prediction Center Norman OK 0354 PM CST Tue Jan 21 2025 Areas affected...portions of southern GA and northern FL Concerning...Heavy snow Valid 212154Z - 220400Z SUMMARY...Wintry precipitation to the west and north should gradually expand in coverage and intensity over portions of southern GA and northern FL late this afternoon and evening. An initial wintry mix of snow, sleet and freezing rain will be possible before heavy snow, with rates near 1 in/hr, develops this evening. DISCUSSION...As of 2140 UTC, regional radar analysis showed a broad area of winter precipitation ongoing over much of the northern Gulf Coast and Southeast. A band of moderate snow was also expanding over portions of south-central GA. So far, temperatures have remained above freezing over portions of southern GA and northern FL. Strong cold advection from upstream stations in the mid to low 20s F should support a continued cooling trend through the remainder of the afternoon and into this evening. Columnar cooling will be further aided by rapid moistening as deep-layer ascent increases with the approach of the main precipitation shield. This should result in temperatures falling to near or below freezing in the next couple of hours, concurrent with the onset of precipitation from heavier banding to the north and west. As precipitation rates intensify, an initial wintry mix of sleet and freezing rain will develop from southwest to northeast. This should be followed by a relatively fast transition to all snow from the far eastern FL Panhandle and across southern GA between 23-02z. Strong frontogenetic response in the 850-700 mb layer and rapidly cooling temperatures may support snowfall rates near 1"/hr for a few hours as snow gradually expands northeastward through the evening hours. ..Lyons.. 01/21/2025 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...CHS...CAE...JAX...FFC...TAE... LAT...LON 30088437 30198306 31128159 31988108 32488132 32928181 33008217 32508404 31498515 30518497 30088437 |
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2025-01-21 22:07:02