When the environmental lapse rate is between the dry and moist adiabatic lapse rates conditions are described as conditionally unstable.
What is conditionally unstable environment?
If the environmental lapse rate lies within the range between 4 °C per kilometer and 9.8 °C per kilometer, then the atmosphere is characterized as conditionally unstable.
A rising parcel could become buoyant if at some point it becomes saturated. But this will change depending on how the temperature of the atmosphere changes at different levels.
Heating the surface throughout the day can make the atmosphere more unstable - that's , more likely for buoyant air parcels to rise, saturate, and produce clouds.
Since warmer air is a smaller amount dense than cold air, it'll become buoyant and rise. If warm air lies above cold air, you'll see that rising motion will be inhibited (any rising parcel will be colder than the warm overlying air). this example is referred to as an inversion.
Any atmospheric change that reinforces this pattern will increase the steadiness of the atmosphere.
Surface cooling, upper level heating, or a mixture of the two will reinforce the stable "warm over cold" pattern.
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