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Mesoscale Discussion 89
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   Mesoscale Discussion 0089
   NWS Storm Prediction Center Norman OK
   0753 AM CST Mon Jan 23 2023

   Areas affected...Parts of New England into extreme east-central NY

   Concerning...Heavy snow 

   Valid 231353Z - 231800Z

   SUMMARY...Occasional snow rates of 1 inch per hour will be possible
   through the morning, as the rain/snow line gradually shifts

   DISCUSSION...A long-duration snow event is already well underway
   across parts of New England, in association with a progressive
   mid/upper-level trough moving out of the Ohio Valley/Upper Great
   Lakes and a deepening surface cyclone currently located near/east of
   Cape Cod. Transient banding features have been noted in area radars,
   which have likely produced at least briefly heavy snow rates within
   the larger precipitation shield. Some consolidation and
   intensification of these bands will be possible through the morning,
   as an embedded midlevel vorticity maximum approaches the region from
   the northern Mid Atlantic, and the primary surface cyclone continues
   to deepen offshore. 

   Surface observations and dual-pol data from KENX and KBOX indicate
   that the rain/snow line has begun to move southeastward across
   western MA and southern NH, and this should continue through the
   morning with the aid of continued deep ascent and low-level cold
   advection. Occasional snow rates of 1 inch/hour will be possible
   within any stronger bands through the remainder of the morning, with
   this threat eventually spreading into some areas currently observing
   rain/freezing rain or mixed precipitation.

   ..Dean.. 01/23/2023

   ...Please see for graphic product...


   LAT...LON   42387230 42217374 42727372 43197357 43537248 43837167
               44107074 43917027 43767041 43577054 43247087 42967121
               42687151 42387230 

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