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Mesoscale Discussion 90
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   Mesoscale Discussion 0090
   NWS Storm Prediction Center Norman OK
   1247 PM CST Mon Jan 23 2023

   Areas affected...portions of Massachusetts into New Hampshire and
   southern Maine

   Concerning...Winter mixed precipitation 

   Valid 231847Z - 232145Z

   SUMMARY...Wintry mixed precipitation across portions of
   Massachusetts into southern New Hampshire should transition to
   mostly snow over the next few hours. Meanwhile, moderate to briefly
   heavy snow may persist across portions of southern Maine, with an
   instance or two of 1+ inch/hr snowfall rates still possible into

   DISCUSSION...A 992 mb surface low is located roughly 200 nm offshore
   of the coast of ME, and continues to progress eastward along with
   the associated wrap-around moisture which has supported several
   hours of wintry precipitation across northern New England. A wintry
   mix has been observed over portions of southern NH into MA for the
   last few hours. However, the departure of the surface low supports
   surface-700 mb cold-air advection across New England, as suggested
   by the 18Z mesoanalysis. As such, a transition to mainly moderate
   snow is expected across southern NH into MA through the afternoon.

   Farther north, a saturated dendritic growth zone remains in place
   across southern parts of ME. While decreasing deep-layer ascent with
   the departing surface low suggests that the snow event in this area
   may have passed peak intensity, at least a few more hours of
   moderate to occasionally snow remains possible, and an instance or
   two of 1+ inch/hr snowfall rates cannot be ruled out through at
   least 22Z.

   ..Squitieri.. 01/23/2023

   ...Please see for graphic product...


   LAT...LON   42187095 41997183 42177267 43237178 44277086 44716964
               44566874 44266898 43956969 43327059 42547105 42187095 

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