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Mesoscale Discussion 2
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   Mesoscale Discussion 0002
   NWS Storm Prediction Center Norman OK
   0307 AM CST Tue Jan 01 2019

   Areas affected...Portions of northern ME

   Concerning...Heavy snow 

   Valid 010907Z - 011500Z

   SUMMARY...Heavy snowfall, with rates of 1 to 2 inches per hour, will
   occur through at least 15Z (10 AM EST).

   DISCUSSION...A shortwave trough over the lower Great Lakes will
   continue eastward along the international border this morning.
   Strong large-scale ascent ahead of this feature has encouraged a
   broad area of precipitation from northern NY into much of New
   England. Light to moderate snow is falling at 09Z across northern ME
   per surface observations and recent radar imagery as the low levels
   saturate. Pronounced low-level warm air advection will continue
   across northern ME through the morning in association with a 50-55+
   kt southerly LLJ. But, a shallow/cold airmass will likely remain in
   place across this region. Saturation of the low levels will also
   cool surface air temperatures to the wetbulb temperature, which
   should generally remain at/below freezing. Therefore, the dominant
   precipitation type that will fall across most of northern ME will
   likely be snow. Saturation and strong lift through the dendritic
   growth zone will support heavy snowfall rates of 1-2 inches per hour
   through at least 15Z (10 AM EST). There may be some potential for a
   transition to sleet and eventually freezing rain with southward
   extent as the 950-850 mb layer slowly approaches 0C around 12-15Z
   and partial melting/refreezing of hydrometeors occurs. The
   northeastward movement of the shortwave trough and attendant surface
   low into the Canadian Maritimes will lead to gradually lessening
   snowfall rates after 15Z.

   ..Gleason.. 01/01/2019

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

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

   LAT...LON   46146769 45806834 45616916 45526991 45797046 46267035
               46457016 46707008 47516930 47496901 47366897 47266889
               47426839 47416818 47076771 46146769 

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Page last modified: January 01, 2019
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