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 term used to identify clouds with a base height below 6,000 feet in the observer's direction. Stratiform clouds consist...

A bomb cyclone is a large mid-latitude storm that forms when a storm’s central pressure drops (i.e. “bombs out”), resulting...

A middle cloud type within the B family in the international cloud classification. These are shaded clouds that can be white...

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

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

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

Jet streams are strong, fast-flowing air currents in the upper levels of the atmosphere. They form when warm air masses meet...

Considerable cloudiness refers to weather conditions where a large portion of the sky is covered with clouds, but some clear...

The mass of air surrounding the earth and bound to it more or less permanently by the earth's gravitational attraction.

The state of the atmosphere when it contains the maximum amount of water vapor possible at a given temperature and pressure.