Linked from
The 24 pages that link to Atmospheric river, each with the reason it gives.
Amazon BasinRelated: Moisture from the Amazon can travel southward in these aerial corridors.
CondensationRelated: Its transported vapor can condense during uplift, producing intense rainfall.
Jet streamRelated: Jet-stream patterns can steer atmospheric rivers toward or away from land.
Extreme weatherBroader topic: Their landfall can produce extreme rainfall and flooding.
Wet seasonRelated: These moisture pathways can amplify seasonal rainfall in some regions.