Dark blue cloudy sky

What is Trough?

An elongated area of relatively low atmospheric pressure, often associated with unsettled weather conditions like storms and rain.

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Glossary

Cloud or rain droplets containing pollutants, such as oxides of sulfur and nitrogen, to make them acidic.

Ice forms on the surface of highways in a very thin layer that is difficult to distinguish from the color of the asphalt...

The temperature at which air becomes saturated with moisture and water vapor begins to condense into liquid form, leading...

A very cold high pressure that originates over the Arctic Ocean.

Frozen drizzle is a dangerous type of frozen rain. It’s a light rain that falls in very fine drops, which freezes on contact...

A periodic cooling of sea surface temperatures in the central and eastern Pacific Ocean, often leading to altered global...

A cloud of irregular appearance, composed of irregular cloud fragments.

Bright and dark rays with changing colors and contrast in the sky. These rays become visible due to the reflection of atmospheric...

Large, fluffy white clouds with flat bases, typically indicating fair weather, though they can develop into storm clouds...

A weather system refers to the movement of warm and cold air across the globe, usually in a recurring pattern. Systems can...