Subj : MESO: Mesoscale Discussion 2286
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Wed Nov 22 2023 14:50:52

ACUS11 KWNS 221450
SWOMCD
SPC MCD 221450=20
MEZ000-NHZ000-221845-

Mesoscale Discussion 2286
NWS Storm Prediction Center Norman OK
0850 AM CST Wed Nov 22 2023

Areas affected...northern Maine and northeastern New Hampshire

Concerning...Heavy snow=20

Valid 221450Z - 221845Z

SUMMARY...Periods of heavy snowfall, with rates up to 1-1.5 inches
per hour, are possible for the next few hours across northern Maine
and northeastern New Hampshire.

DISCUSSION...Heavy snowfall rates have been observed this morning
across portions of northern Maine. This activity is associated with
a surface cyclone currently analyzed along the southern New England
coast. The cyclone should continue to gradually deepen throughout
the morning due to differential cyclonic vorticity advection (ahead
of a mid-level shortwave trough) and low-level coastal baroclinity
as it moves east-northeastward. 12z GYX/CAR soundings exhibited
strong veering in the lowest ~3 km AGL, indicative of widespread
low-level warm-air advection. Temperatures aloft in the lowest 3 km
AGL are nearly isothermal and below freezing, except nearer to the
coast where surface temperatures rising into the 40s F are observed.
Farther inland, the continued northward moisture flux atop colder
surface conditions could contribute to periods of heavy snowfall
(1-1.5 inches per hour) for the next few hours.

...Flournoy.. 11/22/2023

....Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj=
g!8mALJvSqlb74ZTZPgSdByMFlQiSeGI0yVCl2uyYgS7YRPxCk9r4AhtMxzpKjCUEldtVgPgx4E=
DXVsIuyMEBVv_4gDjk$  for graphic product...

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

LAT...LON   44307029 44606929 45106840 45656787 46916786 47196816
            47096881 46596959 45767021 45257067 44887117 44427133
            44177094 44307029=20


=3D =3D =3D
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