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

Observation of the sky from the observer's location where there are no clouds, and there is no obstruction to visibility....

The jet stream forming the boundary between tropical air and sub-tropical air, characterized by isothermal compression and...

A tropical cyclone, also called a hurricane, is a severe tropical storm with wind speeds in excess of 74 mph. Known as a...

A sudden and rapid flow of snow masses accumulated on the slopes of mountainous areas under the influence of gravity or a...

A small, intense downdraft that produces damaging winds at the surface, typically lasting a few minutes and often associated...

A long, narrow region in the atmosphere that transport water vapor, like a river in the sky.

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

The decrease in temperature with height in an adiabatically rising air parcel (lapse rate). For dry air, this value is 1...

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

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