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Mesoscale Discussion 222
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   Mesoscale Discussion 0222
   NWS Storm Prediction Center Norman OK
   0833 PM CDT Mon Mar 23 2020

   Areas affected...Southern into central Maine

   Concerning...Heavy snow 

   Valid 240133Z - 240430Z

   SUMMARY...Heavy snow possible over the next couple of hours, with up
   to 1 inch/hr rates possible. Heavy snow is expected to gradually
   subside by 06Z.

   DISCUSSION...A belt of 925-850 mb warm advection continues to
   transport moisture to portions of northern New England in advance of
   a 1010 mb low and associated mid-level shortwave trough currently
   traversing the Mid-Atlantic region. Deep-layer lift of this
   saturated, sub-freezing low-level airmass (per GYX 00Z sounding)
   will promote efficient dendrite production, especially given the 700
   mb frontogenesis in place. 

   The latest runs of the HRRR, as well as 21Z SREF and 12Z HREF
   guidance all depict a gradual decreasing trend in heavy snowfall by
   06Z, where the main low-level WAA/moist axis will translate to the
   northeast, towards Nova Scotia.

   ..Squitieri.. 03/24/2020

   ...Please see www.spc.noaa.gov for graphic product...

   ATTN...WFO...CAR...GYX...

   LAT...LON   43676980 43567041 44147094 44957055 45876970 46236918
               46076801 45596760 44716794 43676980 

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Page last modified: March 24, 2020
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