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What is Heat Index?

A measure of how hot it feels when relative humidity is combined with the actual air temperature, often referred to as the 'apparent temperature.'

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Glossary

A strong wind typically ranging from 34 to 40 knots (39 to 46 miles per hour) and often associated with rough seas and stormy...

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

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

An instrument that continuously records atmospheric pressure over time. It uses a barometer to measure pressure and creates...

A weather front formed when a cold front overtakes a warm front, lifting the warm air off the ground and resulting in a mix...

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

An instrument for measuring atmospheric pressure.

Any form of water - liquid or solid - that falls from the atmosphere to the Earth's surface, including rain, snow, sleet,...

A measure of how hot it feels when relative humidity is combined with the actual air temperature, often referred to as the...