…Heavy snow over parts of the Sierra Nevada Mountains, Upper Great Lakes
and Central Rockies…
…Below average temperatures in the Northern Plains; above average temps
in the Southern Plains/Lower Mississippi Valley today…
An upper-level trough will swoop into the West Coast from the northeast
Pacific early this week. This trough will direct a very anomalous
subtropical moisture plume along its base at central and southern
California today and Tuesday. A surface low pressure system will help
focus the anomalous moisture over coastal areas as well as the Sierra
Nevada. Parts of the southern Sierra below about 8000 feet may experience
instances of Flash Flooding today. Rock/mud slides and general debris flow
are some of the possible impacts from excessive rainfall in mountainous
areas. Heavy snow is probable at the higher elevations of the southern
Sierra, where 3-4 feet are forecast to accumulate with isolated higher
amounts possible by Wednesday morning. The anomalous moisture feed is also
expected to penetrate into the interior of the West. Parts of the Great
Basin will experience snow showers while heavy snow blankets the
Intermountain West and Colorado Rockies with 1-2′ (isolated 3′) likely
over the next couple of days.
Elsewhere, a pair of low pressure systems moving through the Upper
Midwest/Great Lakes will generate several inches of snow over the Upper
Peninsula of Michigan, while snow showers occur across the greater Upper
Midwest and Lower Great Lakes. Temperatures will remain above average for
one last day from the Southern Plains into the Midwest before a strong
cold front pushes through on Tuesday. Some record high temperatures (in
the mid to upper 80s) might be set over south Texas today. Highs topping
out in the teens and 20s will represent a negative 20-30 degree departure
from normal for parts of the Northern Plains today. Mild conditions
continue over much of the East Coast through Tuesday.
Kebede
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
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