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Mesoscale Discussion 6
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   Mesoscale Discussion 0006
   NWS Storm Prediction Center Norman OK
   1034 AM CST Thu Jan 04 2018

   Areas affected...NH into southern and central ME

   Concerning...Heavy snow 

   Valid 041634Z - 042130Z

   SUMMARY...Heavy snowfall rates (of at least 1"/hour) are spreading
   northward across New Hampshire and through southern into central
   Maine through the afternoon and early evening.  Higher rates of
   2-3"/hour expected into PWM between 19-22Z and MLT between 21-00Z. 
   In addition to heavy snowfall rates, the intensifying storm system
   will result in strengthening winds to produce blizzard conditions
   across coastal regions of New England.

   DISCUSSION...Heavy snowfall rates will continue to spread to the
   west and north across NH into the early afternoon associated with a
   snow band extending from western CT to southern NH/southwest ME per
   mosaic radar.  A second frontogenetic band is expected to develop by
   early afternoon from northeast MA to coastal and southern ME.  The
   forcing for ascent attendant to the second frontogenetic band is
   expected to enhance snowfall rates into the 2-3" per hour range by
   19Z across southern ME and then by 21Z into central ME as this band
   shifts poleward.  Forecast soundings suggest the increase in upward
   vertical motion should occur within the dentritic-growth zone,
   enhancing snowfall rates, while steepening midlevel lapse rates
   could support upright convection/thundersnow potential.  

   The heavy snowfall rates are associated with a strong, dynamic
   winter storm affecting New England through today into this evening. 
   Further deepening of the surface low is expected (1 MB/hour) through
   21Z, as it tracks to the north-northeast, reaching the Atlantic
   waters southeast of Cape Cod (approximately 41N/69W).

   ..Peters/Karstens.. 01/04/2018

   ...Please see for graphic product...


   LAT...LON   42867252 43777204 44807120 45427028 45716943 45886855
               45736763 45116725 44906719 44656734 44056874 43417033
               42827084 42687161 42707210 42867252 

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