Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
411 PM EDT Sun Apr 24 2022

Valid 00Z Mon Apr 25 2022 - 00Z Thu Apr 28 2022

...Colorado...
Day 1...
A shortwave trough to the southwest of the departing cyclone
entering Canada will shear through Colorado tonight/early Monday.
Enough moisture will be present to wring out several inches of
snow over the higher terrain of central CO down through the CO
side of the Sangre de Cristos. Day 1 probabilities for over 6" are
moderate over central CO with low probabilities farther southeast
over the Sangre de Christos with snow levels across the state
around 7000ft.

...Pacific Northwest...
Days 2-3...
Upper low just south of the Gulf of Alaska will weaken as it
reaches Vancouver Island Tuesday. A leading cold front and a weak
surge of moisture into Washington and Oregon Monday will bring
light snow to higher elevations above 6000ft, but more appreciable
height falls move through on Tuesday into Wednesday when snow
levels drop to below 4000ft. WPC probabilities for at least 4
inches are moderate (>40%) to high (>70%) over the Blue Mountains
and low (>10%) over the Clearwater Mountains of ID on Day 2, and
low to moderate over the northern WA Cascades on Day 3.

For days 1-3, the probability of significant icing greater than
0.25 inches is less than 10 percent.


Fracasso