Trough

Rarity: Uncommon

A topic a little better known than average, read and translated beyond its own country.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

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What Wikipedia says

A trough is an elongated region of relatively low atmospheric pressure without a closed isobaric contour that would define it as a low pressure area. Since low pressure implies a low height on a pressure surface, troughs and ridges refer to features in an identical sense as those on a topographic map.

Excerpt from the Wikipedia article “Trough (meteorology)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Pierre cb 04:00, 6 March 2007 (UTC), CC BY-SA 3.0, via Wikimedia Commons.