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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

The occurrence of storms resulting from the horizontal advection of cold air at high levels or the horizontal advection of...

The amount of water vapor present in the air, which can affect comfort levels and weather conditions.

A line on a weather map connecting points of equal atmospheric pressure, used to identify high and low-pressure systems.

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

A thick cloud of tiny water droplets suspended in the atmosphere near the Earth's surface, significantly reducing visibility.

A closed low, also known as a cut-off low, is a low-pressure system that is entirely isolated from the main atmospheric circulation...

A cold core high is a high-pressure system with cold air at its center. These systems are typically associated with clear...

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

A large, organized thunderstorm with a rotating updraft, often producing severe weather such as tornadoes, hail, and heavy...

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