BBS: TELESC.NET.BR Assunto: HVYSNOW: Probabilistic Heavy Snow And Icing Discussion De: COD Weather Processor Data: Tue, 24 Mar 2026 18:49:38 +0000 ----------------------------------------------------------- FOUS11 KWBC 241849 QPFHSD Probabilistic Heavy Snow and Icing Discussion NWS Weather Prediction Center College Park MD 249 PM EDT Tue Mar 24 2026 Valid 00Z Wed Mar 25 2026 - 00Z Sat Mar 28 2026 ...Washington Cascades to Northern Rockies... Days 1-2... A shortwave trough rounding a deep, cold core low over the Gulf of Alaska is directing an atmospheric river into the PacNW today with high snow levels of 7000 to 8000ft. That trough axis approaches the coast tonight before crossing the Cascades Wednesday and the northern Rockies Wednesday night. Associated height falls drop the snow level to 3500ft on the WA Cascades this evening before further decreasing to around 2500ft Wednesday morning under the trough axis (which is also when precip rates decrease). Snow probs for >6" are 40 to 80% above about 4000ft on the WA Cascades with some snow getting down to 3500ft/Snoqualmie Pass level. Precip rates drop off for the Cascades by Wednesday evening. Farther inland, expect snow levels to decrease late tonight over northwest MT and linger around 4000ft over northwest MT through Wednesday. Day 1.5 snow probs for >6" are around 30% for the highest Bitterroots and around 50% for the higher portions of the Lewis Range in Glacier NP and the Mission Ridge which often stands out for it's precip/snow forecast totals. ...Upper Midwest to Northern Maine... Days 2-3... Lee-side low development tonight in central Montana is expected downstream of a trough axis approaching the Pacific Northwest. This low tracks over Lake Superior Wednesday with snow generally in Canada. However, it crosses Maine early Thursday producing moderate snow over northern portions of the state. Day 2 snow probs for >4" are limited to far northern NH terrain and only the higher points of Maine. A second and stronger wave crosses the northern Rockies Wednesday night with an fgen band developing ahead over the northern Plains early Thursday and shifts over the Northeast Thursday night. Some snow mixed precip are likely with this band, though probabilities are limited as of this time. The Day 2 ice probs for >0.01" are 40-70% from northern MN through the U.P. of MI. Jackson $$ = = = 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]