There is a similar but different pattern on the West Coast of the Pacific, albeit significantly more unusual. Rains have already started to fall in California and up the coast all the way to Alaska, with a lot more in the forecast, including loads of snow in BC.
This East Pacific 16 day PWAT forecast animation shows a series of atmospheric rivers bringing multiple episodes of heavy rain up and down the West Coast.
A wider angle view of all of North America shows the collision between the Wet Pacific and cold Arctic Air masses over the Rockies. Meanwhile in the East there is also a very late season cyclone over Haiti (albeit highly speculative at such long range).
Four long range rainfall forecasts:
1. British Colombia
2. California
3. The North East (which gets water from the south and north West)
& 4. North America as a whole.
1. British Colombia
2. California
3. The North East (which gets water from the south and north West)
& 4. North America as a whole.
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