With the arrival of said atmospheric river, the coast can often see hundreds of millimeters of precipitation, sometimes resulting in flooding.
Under the right conditions, what if the pineapple express were to collide with cold arctic air along the coast, and in turn produce outrageous amounts of snow? Considering how 1mm of rainfall translates roughly to 1cm of snowfall, this could hypothetically result in meters of snow within a fairly short timespan.
Are these kind of conditions possible in theory? Or are the conditions needed to form a pineapple express mutually exclusive with the conditions needed for such cold conditions on the pacific northwest?