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  • MESO: Mesoscale Discussion 2286

    From COD Weather Processor@1:2320/105 to wx-storm@lists.illinois.edu on Wed Nov 22 14:50:52 2023
    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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