Dark blue cloudy sky

What is Lightning?

A sudden electrostatic discharge during a thunderstorm between electrically charged regions of a cloud, between clouds, or between a cloud and the ground.

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Glossary

The term used for semi-stationary high-pressure centers such as the Azores and North Pacific Highs, which occur in the narrow...

The trapping of heat in the Earth's atmosphere due to greenhouse gases, such as carbon dioxide and methane, which allows...

A polar vortex is a circulating mass of air in the atmosphere, typically found in polar regions. This rotating air mass occurs...

The heating of the Earth by the sun causes daily changes in both the direction and speed of the wind. During the day, ground...

A deviation from the normal or expected value in atmospheric or climatic conditions, often used in meteorology to identify...

Ice forms on the surface of highways in a very thin layer that is difficult to distinguish from the color of the asphalt...

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

A weather watch means there is a risk of weather hazards in the near future, which could pose a threat to life/property....

A line of severe thunderstorms that can form along or ahead of a cold front, often producing strong winds and heavy rain.

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