Chapter 4 ATMOSPHERIC STABILITY - NWCG
lapse rate less than the dryadiabatic rate of 5.5°F. per 1,000 feet for an unsaturated parcel is considered stable, because vertical motion is damped. A lapse rate greater than dry-adiabatic favors vertical motion and isunstable. In the absence of saturation, an atmospheric layer is neutrally stable if its lapse rate is the same as the
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