…Atmospheric river will produce one last round of heavy rain/mountain
snow and strong wind gusts across the Pacific Northwest today…
…Moderate to heavy snow for portions of the Central Appalachians today…
…Above average temperatures expand across the Central U.S. this
weekend…
Anomalous moisture supported by a deep low pressure system will continue
impacting the Pacific Northwest today. Life threatening flooding is likely
across portions of northern California, where additional amounts of 3-5″
are expected, mainly over coastal areas. As much as 4-10″ of rain are
possible for the northern Sierra Nevada. Dangerous flooding, rock slides
and debris flows remain likely today. A Moderate Risk of Flash Flooding is
in effect for upslope portions of the northern Sierra below 5000′. The
flooding risk will decrease from north to south by later today and into
tonight. Heavy mountain snow is expected over the Washington Cascades and
Northern Rockies through Saturday. Multiple feet of snow are likely to
accumulate over portions of the northern Sierra (above 7000′) by Saturday
evening. Strong winds will continue across coastal areas of northwest
California into western Washington, and over south-central Oregon. These
winds may blow down trees and power lines, and additional power outages
are possible.
A deep upper low will pivot over the Northeast and reinforce a cooler
airmass along with a relatively shallow bit of moisture into the region
today. Some rain and snow showers are expected across much of the
Northeast/northern Mid-Atlantic as a result. Heavier snow will likely
remain confined to the higher terrain of the Central Appalachians, where
between 6-12 inches are expected with locally higher amounts possible.
Snow chances diminish as the day progresses and temperatures rise. Upper
ridging over the Intermountain West and Rockies will shift eastward into
the Central U.S. this weekend where above average temperatures are likely
to follow.
Kebede
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
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