Airmass shower

From Glossary of Meteorology
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airmass shower

A shower that is produced by local convection within an unstable air mass; the most common type of airmass precipitation.

Such showers are not associated with a front or instability line. They are most frequent within a moist air mass that is sufficiently unstable so that daytime heating at the surface can produce well-developed cumulus clouds. The extreme form of airmass shower is the airmass thunderstorm.