# Frontogenetical function

From AMS Glossary

## frontogenetical function

A kinematic measure of the tendency of the flow in an air mass to increase the horizontal gradient of a conservative property θ, defined by the equation where

**∇**_{H}is the horizontal del operator.When θ is identified with the potential temperature, this function measures the frontogenesis in an air mass.

Pettersen, S. 1956. Weather Analysis and Forecasting. 2d ed., Vol. I, . 200–201.