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Mike Powell | All | HVYSNOW: Probabilistic He |
March 9, 2025 9:21 AM * |
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FOUS11 KWBC 090846 QPFHSD Probabilistic Heavy Snow and Icing Discussion NWS Weather Prediction Center College Park MD 446 AM EDT Sun Mar 9 2025 Valid 12Z Sun Mar 09 2025 - 12Z Wed Mar 12 2025 ...Upstate New York and Northern New England... Day 1... A clipper currently crossing into Ontario will track across northern New England late tonight. Some Great Lake moisture will be present in the otherwise continental airmass. Upslope flow onto the Adirondacks and northern Greens/Whites will lead to snow tonight with potential for 0.5"/hr snow rates per the 00Z HREF. Given a weaker clipper will cross this morning, snow from both has Day 1 PWPF for >6" of 30-70% in the highest terrain. ...Washington State to Northwest Montana... Day 1... Northern stream shortwave trough crosses WA this evening and northern MT late tonight. The transitive nature of the trough combined with modest available moisture will limit total precipitation, but heavy snow accumulations are still likely above 4000-5000 ft. Day 1 WPC snow probabilities are above 70% for 6+ inches in the higher northern WA Cascades, generally above pass level, and 30-60% in the higher ridges around Glacier NP. Precip from this trough quickly cuts off Monday morning across the Northwest. ...Northwest and California... Day 3... A much stronger trough amplifies as it digs off the West Coast Tuesday night. Enhanced moisture and height falls from the approaching trough allow moderate precip to cross the PacNW coast Tuesday night. Snow levels at onset will be near 3500ft in WA, 4500ft in OR, and 5000ft in CA, dropping thereafter through Wednesday ahead of the trough axis. Particularly heavy snow is expected in California in noted by Key Messages found on the wpc website. Further information can also be found in the medium range discussion (PMDEPD) and from local WFO products. The probability of significant icing is less than 10 percent. Jackson $$ --- SBBSecho 3.20-Linux * Origin: capitolcityonline.net * Telnet/SSH:2022/HTTP (618:250/1) |
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