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Mesoscale Discussion 4
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   Mesoscale Discussion 0004
   NWS Storm Prediction Center Norman OK
   0840 PM CST Wed Jan 03 2018
   
   Areas affected...Eastern North Carolina...southeast Virginia
   southeast Maryland and southern Delaware
   
   Concerning...Heavy snow 
   
   Valid 040240Z - 040845Z
   
   SUMMARY...Bands of moderate to heavy snow with rates occasionally up
   to or exceeding 1 inch per hour are expected to evolve this evening
   and continue into the early morning over the coastal Middle
   Atlantic.
   
   DISCUSSION...Winter storm affecting eastern NC as of 0130Z this
   evening is in the process of reorganizing, with primary snow bands
   expected to develop from northeast NC through southeast VA and
   southeast MD during the next few hours. An area of pressure falls
   persists from far eastern NC into the western Atlantic. The offshore
   surface low will undergo significant deepening as it develops
   northward along primary baroclinic zone tonight in response to
   strong forcing for ascent attending the shortwave trough now
   approaching the SC coast. This process will be accompanied by a
   corridor of strengthening 850-700 mb frontogenetic forcing northwest
   of the surface low and within favored dendrite growth zone,
   resulting in moderate to occasionally heavy snow with some of the
   bands. Precipitation starting out as rain near the northeast NC and
   far southeast VA coasts due to presence of a melting layer should
   gradually change to snow this evening as cold advection and melting
   lowers the temperature in this layer to sub 0C.
   
   ..Dial.. 01/04/2018
   
   ...Please see www.spc.noaa.gov for graphic product...
   
   ATTN...WFO...PHI...AKQ...MHX...LWX...RAH...
   
   LAT...LON   38647523 37807544 36977582 35807585 35297676 35097837
            37427720 38637598 38647523 

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Page last modified: January 05, 2018
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