pop-up storm
n. A storm that forms quickly, with little or no warning.
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"My biggest concern for lightning is summertime popup storms," said Spencer.

He explained that with springtime storms, where forecasters generally can track the storms well before they reach Wilson County and people can plan their days accordingly, summertime popup storms often happen while people are outside.
—Sara McManamy-Johnson, “Storm smarts: Preparation key in weathering severe weather in Wilson County,” The Lebanon Democrat, March 08, 2014
Chris Strong, of the National Weather Service (NWS) Baltimore/Washington Forecast Office in Sterling, VA, reiterates the forecasting difficulties sometimes encountered with the various D.C. microclimates. But from his perspective, with the exception of sudden pop-up storms, summer weather is generally the most stable and predictable of the entire year.
—Don Lipman, “Washington D.C. weather: Is it a forecasting nightmare?,” The Washington Post, February 27, 2012
1995 (earliest)
Barren limbs of a dead tree at Lake Davis near downtown Orlando support an abundance of feathery life this week: A gathering of water birds. The birds got rained on Thursday and more showers are expected today as our traditional summer afternoon pop-up storms have begun.
—“Nesting and resting” (photo caption), Orlando Sentinel, May 12, 1995
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