Dark blue cloudy sky

What is Weather?

Weather is the day-to-day meteorological conditions that happen in our atmosphere. Weather can change within minutes, which is why it can be difficult to forecast.

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Glossary

A tropical cyclone with sustained winds of at least 74 miles per hour, characterized by a central eye, strong winds, and...

The process by which a solid changes directly into a gas without first becoming a liquid, such as ice turning into water...

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

An instrument for measuring atmospheric pressure.

An image on the weather radar that is convex to the direction of movement and resembles an arc shape, caused by mesoscale...

The formation of fog when warm and moist air passes over a cool or cold surface or, conversely, when cold air passes over...

A mass of very cold, dry air that mostly originates over the Arctic Ocean.

The upward movement of air caused by a topographic barrier, such as a mountain, which can lead to cloud formation and precipitation.

A condition in which the stratification of the atmosphere depends on both air temperature and pressure, and where surfaces...

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