FOUS11 KWBC 220714

QPFHSD



Probabilistic Heavy Snow and Icing Discussion

NWS Weather Prediction Center College Park MD

314 AM EDT Sun Mar 22 2026



Valid 12Z Sun Mar 22 2026 - 12Z Wed Mar 25 2026



...Northeast... 

Days 1-2...



Snow has begun falling across the northern Appalachians and 

northern New England this morning as 850-700mb WAA aloft overruns a

boundary layer sufficiently cold enough to support snow. Snowfall 

rates around 1"/hr are likely over the Green and White Mountains 

this morning, where the combination of heavy rates and elevation 

will support accumulating snowfall. Given the snow is unfolding 

during the day, and boundary layer temperatures are more marginal 

in the valleys, snowfall will be tougher to accumulate but still 

cause some minor accumulations in the Champlain Valley and along 

coastal Maine today. Snowfall will gradually taper off by Sunday 

evening with light snowfall over Downeast Maine still unfolding. 

There will still be cases where light snow ensues over northern New

England Sunday night and into Monday morning as a strengthening 

500mb trough approaches from the west and low-level easterly flow 

directs some Atlantic moisture into the region. Additional light 

snow accumulations of a coating to 3 inches are possible through 

Monday.



48-hour WPC probabilities show high chances (>70%) for >4" of

snowfall throughout southern Maine, the White and Green Mountains,

and the peaks of the Adirondacks. In the Green and White Mountains,

elevations above 2,000ft are likely to see snowfall totals range

between 8-12", with some localized peaks (such as Mount Washington)

potentially receiving over a foot of snow. The WSSI primarily shows

Minor Impacts (winter driving conditions; use caution) with locally

some Moderate Impacts (hazardous travel conditions) possible,

particularly in passes and complex terrain.





...Washington Cascades & Olympics...

Day 3...



A Pacific storm system will direct a plume of moisture at the

Pacific Northwest Monday night and into Tuesday that leads to

higher elevation snowfall. Snow levels initially starting out

between 4,000-5,000ft Monday night and early Tuesday will drop to

as low as 2,500ft in the Olympics and 3,000ft in the northern WA 

Cascades. WPC probabilities show moderate-to-high chances (50-80%)

for snowfall totals >4" above 3,000ft in the Olympics and above

4,000ft in the WA Cascades north of I-90. At this moment,

Snoqualmie and Stevens Passes show low chances (<20%) for

accumulating snowfall >4", but some minor accumulations late

Tuesday into Tuesday night are possible.





The chances for significant ice across the CONUS is less than 

10 percent. 





Mullinax









$$