# Slantwise convective available potential energy

From AMS Glossary

## slantwise convective available potential energy

(Abbreviated SCAPE.) The total amount of potential energy available for conversion into kinetic energy in the slantwise-upward displacement of a particular sample of air in an atmosphere that is unstable to slantwise convection.

It is given by where

*R*_{d}is the gas constant for dry air;*T*_{ρ}is the density temperature of the sample in question, lifted to a pressure*p*by a reversible adiabatic process;*T*_{ρe}is the density temperature of the environment through which the sample is lifted,*PNB*is the pressure at which the lifted sample has the same density temperature as its environment; and denotes that the sample should be lifted slantwise along a surface of constant absolute momentum, or, in circularly symmetric flows such as tropical cyclones, constant angular momentum.