Pineapple Express
n.— «David Guy mentioned this phenomenon of a Pineapple Express which we seem to get about every 10 to 12 years. And that is where we get heavy snows in the Sierra, followed by a warm rain coming from the Hawaiian Islands, which dumps all his warm rain on top of heavy snows, and it all comes down at once.» —“Serial No. 109-32: Water Supply Vulnerabilities In The Sacramento/San Joaquin River System” in United States House of Representatives Oversight Hearing Before the Subcommitte on Water and Power of the Committee on Resources Oct. 20, 2005. (source: Double-Tongued Dictionary)
Further reading
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