• MESO: Heavy Snow USNE

    From Weather Alert@454:1/105 to All on Sat Mar 12 10:41:00 2022
    ACUS11 KWNS 121354
    SWOMCD
    SPC MCD 121353
    MEZ000-NHZ000-VTZ000-MAZ000-CTZ000-NYZ000-NJZ000-PAZ000-121800-

    Mesoscale Discussion 0249
    NWS Storm Prediction Center Norman OK
    0753 AM CST Sat Mar 12 2022

    Areas affected...Parts of eastern Pennsylvania...northern New
    Jersey...eastern New York State...western New England

    Concerning...Heavy snow

    Valid 121353Z - 121800Z

    SUMMARY...A corridor of heavy snow will develop north-northeastward
    across the region through 11 AM-1 PM EST, including occasional
    hourly rates up to 1-2 inches per hour.

    DISCUSSION...As consolidating, amplified mid-level troughing
    gradually pivots eastward across the lower Great Lakes and upper
    Ohio Valley vicinity, the corridor of strongest lower/mid
    tropospheric frontogenetic forcing is forecast to continue to
    develop north-northeastward, inland of northern Mid Atlantic coastal
    through western New England by 16-18Z. This appears likely to
    include a period of lift becoming maximized within the 700-500 mb
    layer, where saturating profiles within the dendritic growth layer
    will become conducive to heavy snow rates on the order of 1-2 inches
    per hour. Although lower levels are still above freezing across
    parts of western New England, temperatures will cool in response to
    low-level cold advection, as deepening elongated surface low
    pressure migrates across the northern Mid Atlantic through southern
    New England coastal areas.

    ..Kerr.. 03/12/2022

    ATTN...WFO...CAR...GYX...BOX...BTV...OKX...ALY...PHI...BGM...
    CTP...

    LAT...LON 45167148 46216972 43887097 41877323 40607417 39807595
    40967597 43077479 44487341 45167148
    $$
    --- SBBSecho 3.14-Linux
    * Origin: Ilink: CCO - capitolcityonline.net (454:1/105)
  • From Weather Alert@454:1/105 to All on Sat Mar 12 18:28:00 2022
    ACUS11 KWNS 121838
    SWOMCD
    SPC MCD 121838
    MEZ000-NHZ000-VTZ000-130045-

    Mesoscale Discussion 0252
    NWS Storm Prediction Center Norman OK
    1238 PM CST Sat Mar 12 2022

    Areas affected...Parts of Vermont...New Hampshire...and Maine

    Concerning...Heavy snow

    Valid 121838Z - 130045Z

    SUMMARY...Heavy snow with rates of 1.0 to 1.5 inch/hour will
    continue spreading northward across parts of New England through the
    afternoon and evening.

    DISCUSSION...Water vapor imagery depicts a large-scale trough moving
    eastward across the Great Lakes and Ohio Valley, with a strong
    downstream midlevel speed maximum overspreading the Northeast. As
    the strengthening ascent within the exit region of the speed maximum
    moves over progressively colder/deeper subfreezing temperatures,
    heavy snowfall will develop northward across parts of Vermont, New
    Hampshire, and Maine this afternoon and early evening.

    Latest mesoanalysis suggests that a deep frontogenetic circulation
    located along the northwestern periphery of a surface low just
    offshore of MA will lift northward across New England over the next
    several hours -- where increasing low-level cold air advection is
    occurring. Here, forecast soundings show a deep/saturated dendritic
    growth zone collocated with the increasing ascent, which should
    support heavy snowfall rates of 1.0 to 1.5 inch/hour across parts of
    VT, NH, and ME. These snowfall rates will also be aided by
    strengthening upslope flow, and localized rates near 2.0 inch/hour
    will be possible primarily over the higher terrain.

    ..Weinman.. 03/12/2022

    ATTN...WFO...CAR...GYX...BTV...ALY...

    LAT...LON 44796991 44117079 43177183 43137255 43737314 44467275
    45237207 45827119 47616926 47546819 46976740 46586744
    45766838 44796991
    $$
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    * Origin: Ilink: CCO - capitolcityonline.net (454:1/105)