Heavy snowfall and intense snowfall rates of 2-4"/hr are likely in the highest elevations of the Shasta/Siskiyou/Trinity ranges
Wednesday then down the length of the Sierra Nevada Wednesday
night into Thursday, where multiple feet of snow is likely above
8000ft or so.
As the moisture and lift press inland late Thursday, a broad area locally heavy mountain snow (snow levels generally 5000-7000ft) spreads over central ID, the Basin and Range of NV, all UT ranges, northern AZ along the Mogollon Rim, and the San Juans in southwestern CO where Day 3 snow probs for over 6" are at least moderate. 40 to 60 percent probs for over 12" are noted for the San Juans on Day 3 (00Z Fri- 00Z Sat).
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Lots of rain at lower elevations and much of CA is in a flood watch. The snow level will be fluctuating between 4k' and 9k' which is bad because drivers may begin a trip thinking all is good but get caught in heavy snow. To add to the problem, another major storm is forecast for Sunday to Tuesday next week.