Meteorology · Stability — Convection
Unstable air, in which a lifted parcel remains warmer than its surroundings, is associated with:
- AStrong subsidence inversions
- BLayered stratus and persistent drizzle
- CCalm, clear, foggy mornings
- DVertical cloud development (cumulus/cumulonimbus), showers, and good visibility between showers✓ Correct
Explanation
When the environmental lapse rate is steep, a rising parcel stays buoyant and continues upward, building heap clouds (cumulus to cumulonimbus) with showers and gusty winds. Visibility is typically good except in the showers themselves.
Authority: Bowditch (Pub. No. 9), stability and clouds; WMO
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