From Glossary of Meteorology
Revision as of 19:14, 26 January 2012 by imported>Perlwikibot (Created page with " {{TermHeader}} {{TermSearch}} <div class="termentry"> <div class="term"> == trough == </div> <div class="definition"><div class="short_definition">In meteorology, an e...")
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)


In meteorology, an elongated area of relatively low atmospheric pressure; the opposite of a ridge.

The axis of a trough is the trough line. This term is commonly used to distinguish the previous condition from the closed circulation of a low (or cyclone), but a large-scale trough may include one or more lows, an upper-air trough may be associated with a lower-level low, and a low may have one or more distinct troughs radiating from it.
See front, dynamic trough, easterly wave, equatorial wave.