- PNW/Western BC/CA stay mostly dry through 11/20 with high pressure ridge.
- Then the pattern shifts on/after 11/21 as the high gets dislodged and lower pressures move into the PNW/BC with a powerful jet.
- Between 11/14-11/21 the Intermountain West stays active with fast-moving north to south cold fronts but only light snow accumulations. This favors Banff, MT, WY, CO, NM.
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My forecast video 11/14:
Infrared satellite shows the storm track, high pressure building into the PNW, and powerful low tracking into AK. This low will reinforce the high pressure ridge across the PNW/BC/CA through 11/20 before the pattern changes.
Pattern Change On/After 11-21
Forecast jet stream flow valid 11/16. Notice the high pressure ridge draped across CA/PNW/BC and fast N-S flow from Banff to MT to WY to CO.
Forecast jet stream valid 11/22. Notice the high pressure ridge is gone from the PNW/BC and is replaced with a powerful jet stream/streak. This would translate into precipitation for the PNW/Banff/BC.
Forecast radar/satellite valid 11/14-11/19.
Forecast snow totals (inches) valid 11/14-11/16.
Forecast snow totals (inches) valid 11/17-11/22. The PNW/BC/CA snow occurs on/after 11/21.