- The jet stream shifts north and blasts the PNW, B.C., and then MT, ID, WY with feet of snow accumulation.
- A large trough of low pressure develops and dip in the jet stream over the North Pacific.
- Starting on 1/4, the jet stream shifts south and begins to target northern UT and the Central and Northern Mountains of CO with big totals 1/5-1/10.
The key feature is the developing trough of low pressure and dip in the storm track in the North Pacific off the PNW coast.
I take a look at the shifting storm track and my snow forecast in two time periods through 1/10 in my forecast video:
The shifting jet stream will deliver strong wind from the PNW to ID, MT, WY, UT, and CO through 1/8.