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instability line

American  

noun

Meteorology.

  1. a nonfrontal line of convective activity in the atmosphere, usually several hundred miles long but of relatively brief duration.

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.