BBS: TELESC.NET.BR Assunto: HVYSNOW: Probabilistic Heavy Snow And Icing Discussion De: COD Weather Processor Data: Sat, 21 Mar 2026 07:15:24 +0000 ----------------------------------------------------------- FOUS11 KWBC 210715 QPFHSD Probabilistic Heavy Snow and Icing Discussion NWS Weather Prediction Center College Park MD 315 AM EDT Sat Mar 21 2026 Valid 12Z Sat Mar 21 2026 - 12Z Tue Mar 24 2026 ...Northeast... Days 1-2... A clipper system will move southeast out of central Canada and into the Northeast this weekend. Snow on the leading edge of the precipitation shield will move into upstate New York this evening, then spread across New England tonight. The snow will be characterized by warm advection. With a high sun angle and plentiful warm air over much of the eastern half of the country, the warm air will move into New York and southern New England, resulting in a changeover to rain on Sunday over much of upstate New York and into southern New England. Meanwhile, over most of northern New England, the predominant precipitation type remains as snow as the back edge of the precipitation quickly pushes east across New England. The southwesterly flow of warm air will be uplifted by the terrain of the Adirondacks, Green, and White Mountains. Here, the combination of upslope and cooler temperatures at higher elevations will support multiple inches of snow. The heaviest snow will fall between early Sunday morning and Sunday evening. In the valleys, warmer temperatures, high sun angle, and snow mostly falling during the day should all work to keep snow totals much lower than the adjacent mountains, though still reaching into advisory criteria. Where snow rates remain lighter, accumulations during the day should be greatly tempered, and largely confined to grassy areas. WPC snowfall probabilities for the storm total snow over 4 inches are high (over 70%) from the northern Adirondacks east across the northern Greens of Vermont, northern Whites of New Hampshire, and much of southern Maine. For much of northern New Hampshire and western Maine, those probabilities are above 90% for 4 inches and over 70% for 8 inches. As typical with compact storms, the exact longevity and intensity of any internal heavy snow bands will dictate where the highest snowfall totals are observed. By D3/Monday, a secondary coastal low is expected to form south of Long Island. The precipitation shield will be narrow and focus across southern New England, where temperatures will be warm enough for mostly (or entirely) rain. Thus, the chances for impactful snow on Monday anywhere in the Northeast continue to decrease. The chances for significant icing across the CONUS is less than 10 percent. Wegman $$ = = = 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]