…Unsettled weather to persist across the Western U.S. through the end of
the week including a new threat of heavy rainfall for California on
Thursday…
…Winter storm to impact the Midwest and Great Lakes region through the
Ohio Valley, Mid-Atlantic and Northeast with a combination of snow, sleet
and freezing rain later today through Thursday…
…Record high temperatures are expected across much of the Southern U.S.
over the next few days…
A persistent deep layer low center and associated trough axis will
continue to provide a general fetch of deeper layer onshore flow and
precipitation for the Pacific Northwest and the northern Rockies going
through today and tonight. This will include additional accumulating
snowfall across the higher terrain with portions of the Cascades along
with the Sawtooth, Bitterroots and Tetons likely to see an additional 6 to
12+ inches of snow. Meanwhile, a new storm system offshore of the West
Coast will approach California on Thursday and bring a new atmospheric
river surge into the coastal ranges as well as the Central Valley and
Sierra Nevada going through Thursday night and Friday morning. Heavy
rainfall is expected with some potential for additional localized flooding
concerns. Over the higher terrain of the Sierra Nevada, heavy snowfall is
expected with as much as 1 to 3 feet of snow expected with this next
system as it moves inland. This new surge of Pacific moisture will also
lead to a new round of very heavy snowfall for the northern Rockies with
an additional 1 to 2+ feet of accumulating snow possible through Friday.
Some of this will also begin to eject east out into the northern Plains to
end the week.
Meanwhile, farther east from the Midwest through the Great Lakes region
and into the Mid-Atlantic and Northeast, there will be arrival of a new
winter storm later today through Thursday which will bring a rather
widespread swath of locally heavy snow, sleet and freezing rain. The
heaviest snowfall with several inches of accumulation expected should
focus across the Upper Midwest and the U.P. of Michigan along with some
interior portions of the Northeast involving New York and the central and
northern parts of New England. South of here across the Ohio Valley and
the Mid-Atlantic region, the cold air that the precipitation will be
encountering with be notably more shallow, and this will be conducive for
sleet and freezing rain. Locally significant ice accumulations will be
possible with a 0.25″+ of ice accumulation, and this will lead to
hazardous travel conditions. Scattered power outages and tree damage will
be possible from the weight of the ice.
Cold air will be generally well entrenched for the remainder of the week
across the northern Plains and the Pacific Northwest which will maintain
below normal high temperatures. Some of the coldest air will continue to
be over Montana where highs will struggle to get above zero. Over the
southern U.S., and to the south of a strong frontal zone, very warm
temperatures will be pooled in a general west to east fashion spanning the
Four Corners region eastward across the southern Plains and most of the
Gulf Coast states. High temperatures will locally reach well into the 80s,
and these temperatures will be as much as 20 to 30+ degrees above normal.
Orrison
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
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