BBS: TELESC.NET.BR Assunto: HVYSNOW: Probabilistic Heavy Snow And Icing Discussion De: COD Weather Processor Data: Sun, 22 Mar 2026 07:14:28 +0000 ----------------------------------------------------------- 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 $$ = = = To unsubscribe from WX-STORM and you already have a login, go to https://lists.illinois.edu and use the "Unsubscribe" link. Otherwise email Chris Novy at cnovy@cox.net and ask to be removed from WX-STORM. --- SBBSecho 3.28-Linux * Origin: Capitol City Online (1:2320/107) ----------------------------------------------------------- [Voltar]