…Heavy snowfall in New England expected into Friday morning…
…Lake Effect snows continue and will expand and intensify greatly with
time; warnings are in effect…
…The coldest air mass since mid to late February becomes entrenched for
most spots east of the Rockies into the weekend…
A dynamic mid-latitude cyclone tracks near the New England coast Thursday
night before moving into Atlantic Canada on Friday. A swath of moderate to
heavy snowfall is likely to develop across portions of the interior
Northeast — winter storm warnings are in effect from eastern New York
through central and northern New England where over one foot of fresh snow
is possible.
Disturbances aloft will send reinforcements to the cold air mass east of
the Rockies with a strong and cold surface high nosing into the Plains.
It is expected to be the coldest air mass since mid to late February
across the Northern Plains and Midwest; wind chills should fall below
zero, perhaps as low as -40F in North Dakota on Friday and Saturday.
Daily record cold low and high temperatures are possible between the Upper
Ohio Valley and southern Appalachians from Friday into Monday, where the
cold is most anomalous for late November and early December. In and near
northeast Missouri and southern Illinois, a swath of light to moderate
snow is expected to fall on Saturday, which would lead to minor impacts
for cities such as St. Louis and Evansville, Indiana.
Lake effect snows, ongoing across portions of Michigan, should expand and
intensify downwind of all Great Lakes as the increasing cold within
cyclonic low level flow interacts with record warm Great Lakes
temperatures for late November. Thundersnow is possible in some spots.
Snowfall totals up to 3 inches in an hour are possible. The snowfall
accumulations will be significant through Saturday, up to 5 feet of snow
is forecast downwind of Lake Ontario in northern New York which could
receive a moisture fetch off three of the Great Lakes. Winter Storm and
Lake Effect snow warnings are in effect for areas downwind of the Great
Lakes.
Florida will remain mild to warm, and winds remain mostly off warm, but
slowly cooling, waters of the Gulf of Mexico and the westernmost Atlantic.
Roth/Kedebe
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
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