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Mesoscale Discussion 27
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   Mesoscale Discussion 0027
   NWS Storm Prediction Center Norman OK
   0711 AM CST Sat Jan 07 2017

   Areas affected...Southeastern VA...Delmarva Peninsula

   Concerning...Heavy snow 

   Valid 071311Z - 071715Z

   SUMMARY...A band of heavy snowfall is expected from southeastern VA
   northeastward into the Delmarva peninsula. Snowfall rates of 2
   inches per hour are possible.

   DISCUSSION...Low-level southeasterly flow is expected to continue to
   increase just off the northeastern NC/southeastern VA coast as the
   shortwave trough approaching the region continues to mature.  The
   resulting increase in warm-air advection/frontogenesis will support
   heavy snowfall. Current observations reveal heavy snowfall is
   already underway across southeastern VA and the expectation is for
   the band across this area to become better organized over the next
   hour or two, with heavy snowfall expanding northeastward into the
   Delmarva peninsula. Recent RAP guidance progs OPRH values from -1.5
   to -2 across the region, suggesting snowfall rates near 2 inch per
   hour are likely. This is supported by the recent NGU observation,
   which reported 2 inches in the last hour.

   ..Mosier.. 01/07/2017


   LAT...LON   37367782 38417620 38677518 38377472 37237535 36447677
               36417798 37367782 

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