There can be several instances of a Pineapple Express in any given year, but they are most common during the stormier fall and winter months along the West Coast.

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It is characterized by a strong and persistent large-scale flow of warm moist air, and the associated heavy precipitation. A Pineapple Express is an example of an atmospheric river, which is a more general term for such relatively narrow corridors of enhanced water vapor transport at mid-latitudes around the world.

The Pineapple Express is a name given to an atmospheric river that is a common feature for the west coast of the US and Canada. It derives its name from the warm moist air that gets entrained into the system, that initially starts off near Hawaii - a place famed for growing pineapples.