Trough
Climate Change
On a weather chart, a narrow, elongated area of relatively low pressure.
- — ARM Climate Research Glossary retrieved 2014-06-12
Trough In meteorology, an elongated area of relatively low atmospheric pressure; the opposite of a ridge.
Weather
An elongated area of relatively low atmospheric pressure, usually not associated with a closed circulation, and thus used to distinguish from a closed low. The opposite of ridge.