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

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

Corrected to fix time period references

...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. Day 1 will be the wettest with PW anomalies rising to
up to +3 sigma followed by a continued, but gradually decreasing,
wet pattern for days 2-3 as the moisture plume sinks/fades 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 in
association with the heaviest precipitation during day 1, and thus
the greatest snow totals will be 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.

...Northeast...
Days 2-3...

A clipper system will move through the Great Lakes and into the
Northeast on days 2-3 with light to moderate snow over northern
New York eastward into New England. The 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