Instability lines
From Glossary of Meteorology
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instability line
(No longer frequently used.) Any nonfrontal line or band of convective activity in the atmosphere.
It is a general term and includes the developing, mature, and dissipating stages. However, when the mature stage consists of a line of active thunderstorms, it is properly called a squall line; therefore, in practice, instability line often refers to the less active phases.
See also pseudo front, prefrontal squall line
See also pseudo front, prefrontal squall line
Fulks, J. R. 1951. Compendium of Meteorology. 647–652.
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