Airmass precipitation

From Glossary of Meteorology

airmass precipitation

Any precipitation that can be attributed only to moisture and temperature distribution within an air mass when that air is not, at that location, being influenced by a front or by orographic lifting.

The most common form of airmass precipitation is airmass showers; however, a moist but stable air mass may produce drizzle independent of frontal or orographic influences.

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