Height-change line
From Glossary of Meteorology
height-change line
(
Also called contour-change line, isallohypse.) A line of equal change in height of a constant-pressure surface over a specified previous interval of time; the lines drawn on a height-change chart.
Also called contour-change line, isallohypse.) A line of equal change in height of a constant-pressure surface over a specified previous interval of time; the lines drawn on a height-change chart.