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
$$
--- SBBSecho 3.14-Linux
* Origin: Ilink: CCO - capitolcityonline.net (454:1/105)