For an overview of the situation in BC, found this in the Guardian UK:
* * *
Atmospheric river': the term was coined in the 1990s. These are narrow water
plumes in the upper atmosphere, that can be thousands of kilometers long but
only a few hundred wide. Quite normal, and how rains travel to the Western Coast
of America and Europe. But at this intensity, clearly part of the climate crisis.
Experts had warned the Fraser Valley in the BC interior woud be hit more often
and with greater severity. The rain there is 'orographic' ie over a mountain ridge...
(Wikipedia)
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