popcorn storm n. a brief, unexpected rain shower or thunderstorm. Also, collectively and more formally, popcorn convection. (source: Double-Tongued Dictionary)
Further reading
Unwrap the name of a candy bar, and you just might find a story inside. For instance, one chewy treat found in many a checkout lane is named after a family’s beloved horse. And: 50 years ago in the United States, some Latino elementary...
A slatch is a brief respite or interval when the rain lets up, as in We must wait for a slatch of fair weather. This is part of a complete episode.
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