This type of inversion usually dissipates with daytime heating. Inversions aloft caused by large scale subsidence may persist for several days. A large area of rising air through a relatively deep layer of the atmosphere. As the air rises, it cools and condenses water vapor into clouds and precipitation. A replacement of the current air mass with air from off the ocean.
Temperatures are much cooler and relative humidities much higher.
A term used in smoke management forecasts. It represents the top of the layer through which relatively vigorous mixing will take place. This is the height at which smoke loses its buoyancy and stops rising. It will then move off with the prevailing wind direction at that level. LAL 3 - Much building cumulus with scattered thunderstorms.