FOUS11 KWBC 070853
QPFHSD

Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
353 AM EST Sat Mar 7 2026

Valid 12Z Sat Mar 07 2026 - 12Z Tue Mar 10 2026

...Upper Midwest... Day 1...

Surface low center tracks northeast from WI early this morning
across northern MI through midday. Strung out comma head fgen
banding over southern MN lifts northeast across northern WI and the
western U.P. this morning. Right entrance jet dynamics aid lift and
allow snow rates around 0.5"/hr per 00Z HREF around 12Z in the
Bayfield area of WI and along the western U.P. shore/Porcupine
Mtns. Snow lifts northeast of the Keweenaw Peninsula by noon.

...New Hampshire and Maine... Day 1...

Warm air advection rain ahead of a trough is currently entering
western NY. This shifts to the White Mtns of NH and Maine later
this morning where subfreezing temps persist inland from the coast
as high pressure continues to retreat over Atlantic Canada. Day 1
PWPF for >0.1" are 20-30% in the interior terrain of Maine and the
White Mtns of NH.

...Washington to Northern Rockies... Days 2-3...

A trough shifts over the Gulf of Alaska today before digging south
down the BC coast through Monday. A tight baroclinic zone
accompanies this trough with a powerful onshore jet and enhanced
moisture that pushes into Washington early Sunday. Snow levels
around 6000ft in the moisture surge Sunday morning steadily
decrease through Sunday night, reaching around 500ft by 12Z
Monday. Will need to monitor precip likelihood for the Seattle
metro given Olympic shadowing in the westerly flow, but there is a
chance for snow down near sea level particularly (from a thermal
perspective) Monday night.

Otherwise it's terrain based snowfall late Sunday night through
most if not all of next week. This streams east across NW MT where
snow levels will be 1000ft or less starting Monday. Day 2 snow
probs for >6" are 50-90% for the WA Cascades and the Lewis Range in
Glacier NP. These probs expand down to Mt Hood for Day 3 and well
below pass level on the WA Cascades. The axis shifts south a bit
inland with Day 3 snow probs for >6" over the Bitterroots and
northern Absarokas in the 30-60% range.

Jackson

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