Pineapple Express
n.— «In mid-February, the jet stream split in two over the mid-Pacific. The two arms of the jet stream then collided just off the California coast, with one bringing cold air from Alaska and the other—dubbed the “Pineapple Express”—bringing warm moist storms from Hawaii.» —“Jet Stream Meanderings Weather: Take Hawaii and Then Stir in Alaska” by Thomas H. Maugh II, Ronald B. Taylor Los Angeles Times Mar. 21, 1986. (source: Double-Tongued Dictionary)
Further reading
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