…Strong atmospheric river continues to impact northern California with
heavy rain and life-threatening flooding through Friday…
…Developing storm system forecast to bring another round of gusty winds
to the Pacific Northwest on Friday with heavy mountain snow spreading
toward the northern Rockies this weekend…
…Unsettled weather expected across much of the Northeast and Great Lakes
over the next few days, including the likelihood of heavy snow in the
central Appalachians and higher elevations of northeastern Pennsylvania
and southern New York…
Impactful and for some place dangerous weather conditions will continue
through early this weekend as two separate storm systems impact the Lower
48. Starting in the West, a strong atmospheric river currently impacting
northern California is forecast to remain relatively stationary over the
next few days and produce an additional 6-12 inches of rainfall over
regions with already saturated terrain. The atmospheric river is expected
to peak in intensity today, but with moderate bouts of rain lingering
through much of Friday and snow levels finally lowering somewhat on
Saturday. In the meantime, dangerous flooding, rock slides, and debris
flows are likely, which has prompted a High Risk (level 4/4) of Excessive
Rainfall to be issued across the northern California coastline today. Be
sure to check conditions before traveling and never drive across flooded
roadways.
Aiding the surge of atmospheric moisture into northern California and the
Northwest through the end of the week is a developing storm system
forecast to swing off the Oregon and Washington coastline on Friday. A
punch of gusty winds are expected, mainly along coastal regions, could
produce rough surf and additional isolated power outages. As precipitation
lifts northward and inland along a draped stationary boundary stretching
from the northern Rockies to British Columbia, heavy snow is possible from
the Washington Cascades to the western Montana, Idaho, and northwestern
Wyoming mountain ranges through early Sunday.
November snowfall is also in the forecast for parts of the Northeast and
Great Lakes thanks to a potent upper-level low swinging over the region.
At the surface, a compact area of low pressure is currently looping around
the Great Lakes with an eventual southward trajectory over Lake Michigan
later today. Parts of eastern Wisconsin could see precipitation fall as
snow along with wind gusts up to 40 mph. Winter Weather Advisories have
been issued for snowfall amounts up to 3-4 inches. Meanwhile, a separate
area of low pressure developing near Long Island tonight is also expected
to track in a looping orientation across the Northeast through Friday,
while also producing periods of heavy snow. The greatest chances for at
least 6 inches of snowfall is found across northeast Pennsylvania and
southern New York, including the Pocono and Catskill mountains.
Additionally, a long-duration upslope snow event is underway across the
central Appalachians and anticipated to linger through at least early
Saturday. Up to a foot of snow is possible across the higher terrain of
West Virginia, Maryland, and southwest Pennsylvania. Light snow is also
expected to reach as far south as the higher ranges of North Carolina.
The central and southern U.S. can expect much more tranquil conditions as
high pressure creates a void in the unsettled weather impacting both the
East and West coasts. However, below average temperatures are forecast
from the Mississippi Valley to the Southeast as breezy northwest flow
ushers in a colder airmass. This may lead to early morning frost and/or
freeze potential across the Southeast and Lower Mississippi Valley.
Snell
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
Leave a Reply