BBS: TELESC.NET.BR Assunto: HVYSNOW: Probabilistic Heavy Snow And Icing Discussion De: COD Weather Processor Data: Mon, 23 Mar 2026 07:26:37 +0000 ----------------------------------------------------------- FOUS11 KWBC 230726 QPFHSD Probabilistic Heavy Snow and Icing Discussion NWS Weather Prediction Center College Park MD 326 AM EDT Mon Mar 23 2026 Valid 12Z Mon Mar 23 2026 - 12Z Thu Mar 26 2026 ...Northern New England... Day 1... An inverted trough, extending back from the departing storm system responsible for rounds of snow yesterday, will linger across northern New England today. With sufficient low-level moisture off the Atlantic and vertical ascent supplied by an approaching shortwave trough to the west, periods of snow will continue over the White Mountains. Some light snow is possible below 1,000ft, but given the snow is occurring during daytime hours, snow will struggle to accumulate on paved surfaces. WPC probabilities depict moderate-to-high chances (50-70%) for additional snowfall accumulations >4" in the White Mountains, which included Mount Washington. Otherwise, any additional snowfall accumulations below 2,000ft are likely to range between a coating-3". ...Washington Cascades & Olympics... Days 1-3... A strong and meandering closed upper low in the Gulf of Alaska will direct a storm system forming on its southern flank at British Columbia the first half of the week. With the Gulf of Alaska low slow to move east and low level ridging in place off the southern CA coast, low-level SWrly flow will supply a narrow corridor of Pacific moisture into the Pacific Northwest Monday night and through both Tuesday and into Wednesday. Snow levels will generally reside above 3,000ft through Tuesday, but a cold frontal passage and falling 700-500mb heights Tuesday night will cause snow levels to dip to as low as 2,000ft by Wednesday. Still, the cold air in wake of the cold frontal passage is not particularly cold, and the best moisture advection will have already concluded by Wednesday. This is likely to cause periods of mountain snow on Wednesday in the Olympics and Cascades to as low as 2,000ft, but rates will not be overly heavy even through Wednesday night. WPC probabilities for >4" of snow are moderate-to-high (50-80%) for elevations above 4,000ft north of I-90. Stevens Pass sports moderate-to-high chances (50-80%) for snowfall totals >4" through Wednesday night, while Snoqualmie Pass has moderate chances (40-60%). Both passes sport low-to-moderate chances (20-40%) for snowfall totals >8", so some locally hazardous travel conditions are possible at pass level, but the heavier totals surpassing 8" will likely be found at higher elevations for this event. 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]