Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
432 AM EDT Mon Apr 25 2022

Valid 12Z Mon Apr 25 2022 - 12Z Thu Apr 28 2022

...Colorado...
Day 1...
A shortwave trough axis shifts east across the rest of the CO/NM
border this morning with ongoing snow over the Sangre de Christos
with snow levels around 6000ft tapering off shortly after 12Z.


...Pacific Northwest...
Days 1-3...
An upper low anchors over the Queen Charlotte South today. A
leading cold front and a weak surge of moisture into Washington
and Oregon Monday will bring light snow to higher elevations above
5000ft, but more appreciable height falls move through tonight
when snow levels drop to around 3000ft. WPC probabilities for at
least 4 inches are moderate (>40%) to high (>70%) over the
northern WA Cascades, the Blue Mountains of OR and low (>10%) over
the Clearwater Mountains of ID on Days 1.5/2, and low to moderate
over the Olympics on Day 3.


...Northeast...
Days 2/3...
A shortwave low crossing the Upper Midwest tonight/Tuesday and
northern NY Wednesday. A surface low develops over/off the New
England coast Wednesday which enhances moisture along with height
falls allows interior/elevation snow. Day 3 snow probabilities for
over 4" are 20 to 30% over the northern Adirondacks, Greens, and
Whites.


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


Jackson