…Snow will fall over parts of the Great Lakes, Central Appalachians, and
Northeast…
…Record warmth possible across the West Friday and Saturday,,,
The general flow pattern favors an upper level trough across the eastern
Pacific ocean, ridging aloft in the West, and troughing aloft in the
eastern United States. The consequence of this pattern will be some
rainfall along the West Coast, warmth across the Intermountain West, and
cold across portions of the East. Starting out West, skirmishes of rain
along the West Coast are expected both Friday and Saturday as low pressure
systems move from the eastern Pacific first into Alaska then into western
Canada. By Saturday, the second low moving into western Canada will push
rainfall into the northern Intermountain West, and snowfall at higher
elevations by Saturday afternoon and evening. High temperatures across
northern portions of the West will rise into the 40s and 50s, high enough
to threaten record high temperatures Friday into Saturday. Across the
Southwest, high temperatures should rise into the 70s and 80s, also
threatening record high temperatures in and near southern Arizona.
Mid-continent, a seasonably strong and cold high pressure system migrates
from the Great Plains into the Great Lakes, bringing below average
temperatures near and to its east. For some areas of the East, it should
be the coldest temperatures thus far this winter. When combined with
cyclonic flow around a pair of lows moving through the Midwest and
offshore the East Coast, lake effect and lake enhanced snowfall is
expected near the Ohio Valley, Great Lakes, portions of the Appalachians,
northern Mid-Atlantic States, and New England Friday and Saturday. Winter
weather advisories are in effect for portions of Michigan and the southern
Appalachians to advise further on the snow threat. Across lower
elevations of the Carolinas and southern Mid-Atlantic coast, rain will be
possible on Friday before the lows move out to sea.
Roth
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
