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

Particles such as pollen, grass seeds, or dust in the air that cause allergies and are transported by winds.

Conduction is the transfer of heat or electricity through a material without the material itself moving. This occurs when...

A rapidly rotating column of air extending from a thunderstorm to the ground, capable of causing significant damage.

A weather warning means that a weather hazard is occurring, imminent, or likely. In other words, severe weather is happening...

An instrument used to measure the speed, force, and sometimes the direction of the wind. It can be cup or pressure tube anemometers....

Precipitation in the form of small balls or lumps of ice that form in thunderstorm updrafts and fall to the ground.

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

Confluence refers to the area where two or more air streams or bodies of water meet and combine. In meteorology, it often...

The percentage of water vapor in the air relative to the maximum amount of water vapor the air can hold at a given temperature.

Thermodynamic changes occurring within a system without any exchange of heat with the surroundings. In the atmosphere, changes...