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

Valid 12Z Sun Apr 24 2022 - 12Z Wed Apr 27 2022

...Northern Plains...
Day 1...
An occluded cyclone over southeastern ND will shift northeast
across northern MN today. Locally heavy snow in a pivoting
deformation bands on the west side over western ND/SD with hourly
rates around 1" will slowly taper off this morning as the system
pulls away. Day 1 snow probabilities for snowfall after 12Z
focuses low probabilities for over 4" in northeastern
ND/northwestern MN where banding immediately adjacent to the low
center will continue to transition to snow through the rest of the
morning.

...Colorado...
Day 1...
A shortwave trough to the southwest of the cyclone approaching MN
will shear through Colorado today into 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 stated around
7000ft.

...Pacific Northwest...
Day 3...
Upper low shifting southeast from the Gulf of Alaska will reach
Vancouver Island Tuesday. A leading cold front and a weak surge of
moisture reaches Washington and Oregon Monday. However, the snow
levels will be 5000-7000ft in prefrontal precip, so it's not until
Tuesday when appreciable moisture in the colder sector comes
ashore with snow levels below 4000ft. Day 3 snow probabilities for
over 6" are low over the WA Cascades and the Blue Mountains in
northeastern Oregon and the Clearwater Mountains of ID.


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


Jackson