Storm Prediction Center Mesoscale Discussion 78

   Mesoscale Discussion 0078
   NWS Storm Prediction Center Norman OK
   0524 PM CST Sat Feb 08 2025

   Areas affected...far northern portions of the Mid-Atlantic and far
   southern portions of New England

   Concerning...Winter mixed precipitation 

   Valid 082324Z - 090330Z

   SUMMARY...Snow should overspread the region in the next few hours.
   With time, the snow should transition to sleet and even freezing
   rain before ending later this evening/overnight.

   DISCUSSION...An area of mixed winter precipitation continues across
   western and central Pennsylvania this evening. This precipitation
   area developed/is being maintained on the nose of strong low-level
   warm-air advection across a deep layer. Over the next few hours this
   warm-air advection and associated isentropic ascent will overspread
   eastern Pennsylvania and much of New Jersey. Surface temperatures in
   the upper-20Fs and low-30Fs, coupled with dewpoint temperatures in
   the upper-teens and low-20Fs, yield wet-bulb temperatures below 32F.
   Thermal profiles across the region will initially support all snow.
   However, as the warm-air advection warms the low-levels, the maximum
   temperature in the column should increase above 32F yielding sleet
   and potentially eventually freezing rain before precipitation ends
   from southwest to northeast.

   ..Marsh.. 02/08/2025

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

   ATTN...WFO...OKX...PHI...BGM...CTP...LWX...

   LAT...LON   39177553 39527647 40417671 41247631 41547565 41477463
               41017363 39987304 39137378 38907485 39177553