…Heavy snow over parts of the Sierra Nevada Mountains, Great Lakes and
Central Rockies…
…Below average temperatures in the Plains…
A moderate level atmospheric river event will accompany a surface low
pressure system as it moves into the West today. This AR will spread
anomalous moisture over southern/central California, the Great Basin and
Central Rockies. Heavy coastal and mountain rain may lead to instances of
flash flooding, particularly over the windward foothills of the southern
Sierra Nevada below 8000 feet, where excessive rainfall may cause
land/rock/mudslides. Heavy snow accumulating between 1-3 feet are possible
over the higher elevations of the southern Sierra, as well as much of the
Intermountain West and Central Rockies today. Snow diminishes over the
Sierra on Wednesday while snow showers persist over the Colorado Rockies.
Snow showers continue across the Great Lakes this week with parts of the
Upper Peninsula of Michigan and downwind areas of Lake Ontario picking up
between 4-8 inches of snow by Thursday morning.
Troughing across the northern tier states will continue to promote below
average temperatures over the next several days. High temperatures in the
teens and 20s will represent a 15-25 degree departure from normal for much
of the far Northern Plains today and Wednesday. A pair of mid-level
disturbances are expected to phase over the Central U.S. and facilitate an
arctic outbreak across the region Wednesday night into Thanksgiving
Thursday.
Kebede
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
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