Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
328 PM EST Sun Feb 27 2022

Valid 00Z Mon Feb 28 2022 - 00Z Thu Mar 03 2022

...Pacific Northwest...
Days 1-3...

An impressive atmospheric river event is taking shape across the
Pacific Northwest with widespread precipitation expected over the
next 3 days. An initial round of precipitation arrives during the
day 1 period but the wettest day arrives on Monday associated with
PW anomalies up to +3 sigma followed by a continued wet pattern
for day 3 as the moisture plume sinks into Oregon. Three-day
liquid totals will exceed several inches with some isolated
amounts over 8" possible in the highest peaks. This system is
relatively warm so snow levels will be quite high (initially lower
on day 1), but particularly so on day 2 in association with the
heaviest precipitation and thus greatest snow totals limited to
the highest peaks of the WA Cascades and the peak of the Olympics.
Moisture will translate eastward into northern Idaho and northwest
Montana with the higher peaks receiving more than 8-12 inches. WPC
probabilities are high for 8+ inches for the WA Cascades while
probabilities for 6 inches or more even reach moderate to locally
high for portions of the northern Rockies day 2.

...Northeast...
Day 3...

A clipper system will move through the Great Lakes and into the
Northeast on Day 3 with light snow over northern New York eastward
into New England. Quick pace will limit amounts despite a brief
surge in moisture into Maine as the system zips off to the east.
WPC probabilities for at least 4 inches of snow remain low
(10-20%) over northern NY into Maine.

Churchill/Fracasso