FOUS11 KWBC 270707
QPFHSD

Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
307 AM EDT Fri Mar 27 2026

Valid 12Z Fri Mar 27 2026 - 12Z Mon Mar 30 2026

...Western Great Lakes... Day 1...

Cold air (850mb temperatures around -15C) over the western Great
Lakes will support light snow across the region tonight as a mid-
level shortwave moves through the region this afternoon/tonight.
Amounts will be light (1-2" but could touch 4" over parts of the
U.P. of Michigan where WPC probabilities are near 10%.

...Pacific Northwest/Northern Rockies... Day 3...

Upper trough diving southeastward along the BC coast will move
into the Pacific Northwest on Sunday, bringing some mountain snow
to the Cascades and then into the northern Rockies along the
Divide. Colder air will rush in behind the cold front, allowing
snow levels initially near 2500-4000ft to fall to 1500-3000ft
overnight Sunday into early Monday (Cascades) but remain around
5000-600ft over northwestern MT. This will get some light snow to
the passes in WA, but probabilities for at least 4 inches of snow
are greater than 50% above about 4000-5000ft (Cascades) and 6000ft
over the Lewis Range.

The probability of significant icing across the CONUS for days 1-3
is less than 10%.

Fracasso

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