popcorn convection
n.— «Popcorn Convection. Slang for showers and thunderstorms that form on a scattered basis with little or no apparent organization, usually during the afternoon in response to diurnal heating. Individual thunderstorms typically are of the type sometimes referred to as air-mass thunderstorms: they are small, short-lived, very rarely severe, and they almost always dissipate near or just after sunset.» —“National Weather Service Glossary” National Oceanic and Atmostpheric Administration Apr. 21, 2005. (source: Double-Tongued Dictionary)
Further reading
National Book Award winner Barry Lopez had wise advice for young writers. First, read widely and follow your curiosity. Second, travel or learn a foreign language. And third, find out what you truly believe, because if you’re not writing from...
There are lots of colloquial phrases to explain away the cacophony of a thunderstorm: The potato wagons are rolling, The tater wagon’s going over the bridge, The potato wagon broke down, and God is dumping out potatoes and washing them off. In...