Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
258 PM EDT Fri Oct 28 2022

Valid 00Z Sat Oct 29 2022 - 00Z Tue Nov 01 2022

...Pacific Northwest...
Days 2-3...

The next atmospheric river arrives into NW WA Saturday evening on
a 150kt jet streak into British Columbia that persists into WA
through Sunday before drifting south to OR. The associated surge
of moisture will have PW anomalies +1.5 to +2 sigma and IVT of up
to 700 kg/m-s which will result in multi-inch QPF to the Olympic
Peninsula and the central/northern WA Cascades. Snow levels rise
in this warm air to around 7000ft, confining heavy snow totals to
the highest peaks of the northern WA Cascades where accumulations
over 6 inches are likely from 12Z Sunday to 12Z Monday.


The probability of significant icing greater than 0.25" is less
than 10 percent.


Jackson