Dark blue cloudy sky

What is Frost?

The formation of ice crystals on surfaces when the temperature drops below freezing, typically overnight, causing potential damage to plants and crops.

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Glossary

A drainage wind that flows downhill due to gravity, often associated with cold air descending from elevated regions.

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

Convection is the vertical movement of air caused by temperature differences, where warm air rises and cool air sinks. It...

The percentage of water vapor in the air relative to the maximum amount of water vapor the air can hold at a given temperature.

The reflectance rate of a surface, indicating the amount of electromagnetic radiation reflected from the surface. It depends...

A weather system refers to the movement of warm and cold air across the globe, usually in a recurring pattern. Systems can...

The term 'cloudy' refers to weather conditions characterized by a significant amount of cloud cover in the sky. This may...

A cold front is the leading edge of a cold air mass that replaces a warmer air mass. It is typically associated with sudden...

A weather warning means that a weather hazard is occurring, imminent, or likely. In other words, severe weather is happening...

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