MD 1954 CONCERNING HEAVY SNOW FOR PORTIONS OF NORTHERN ME
Mesoscale Discussion 1954
NWS Storm Prediction Center Norman OK
1036 AM CST Wed Nov 16 2022
Areas affected...Portions of northern ME
Concerning...Heavy snow
Valid 161636Z - 162200Z
SUMMARY...Heavy snow, with rates around 1 inch per hour, should
occur through the afternoon across parts of northern Maine.
DISCUSSION...A shortwave trough over northern NY and southern
Ontario/Quebec will progress northeastward today. Strong large-scale
ascent associated with this feature will overspread northern New
England through the afternoon. A band of precipitation associated
with pronounced frontogenesis in the 700-500 mb layer currently
exists over southern Quebec into northern ME. Based on the 12Z
sounding from CAR and latest RAP forecast soundings, expectations
are for the bulk of this precipitation to fall as snow across
northern ME over the next several hours. Strong ascent through the
saturated dendritic growth zone should support a band of heavy snow,
with rates around 1 inch per hour, mainly across northern ME through
this afternoon. Locally higher rates may occur within the most
intense portions of the heavy snow band. The stronger forcing aloft
will eventually shift into Canada by this evening, with the heavy
snow also developing northward and away from northern ME. A mix of
freezing rain and sleet may occur on the southern fringe of the
precipitation band, where low-level warm advection will support some
melting of frozen hydrometeors.
..Gleason.. 11/16/2022
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...CAR...
LAT...LON 47526927 47476897 47256888 47426833 47326804 47036771
46386774 46086883 45996970 45997036 46357029 46477008
46747003 47526927
