# Montgomery streamfunction

From AMS Glossary

## Montgomery streamfunction

The quantity

*gz*+*c*_{p}*T*measured on an isentropic surface where*g*is the acceleration of gravity,*z*the height of the isentropic surface,*c*_{p}the specific heat of air at constant pressure, and*T*the Kelvin temperature; or it is sometimes defined as the same quantity divided by the Coriolis parameter.This is the streamfunction for the geostrophic wind on the isentropic surface.