popcorn storm
n.— «According to National Weather Service meteorologist William Babcock, the storms were part of a line of disturbances commonly called “popcorn storms.” “Because they pop up all over the place,” Babcock said.» —“Severe storms blast through region, more expected to hit today” by Stephanie Hooper Nashua Telegraph (New Hampshire) July 22, 2006. (source: Double-Tongued Dictionary)
Further reading
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