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What is Warning?

A weather warning means that a weather hazard is occurring, imminent, or likely. In other words, severe weather is happening now, developing as we speak, and is minutes away. This weather hazard poses a threat to life and property.

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Glossary

Nor'easter is a meteorological event commonly observed in the Northeastern United States and typically occurs during the...

Anticyclones are areas of high atmospheric pressure that bring hot, dry weather in the summer and cold fronts in the winter.

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

The amount of radiation, heat, or light passing through or flowing from a unit area of a surface.

An instrument used to measure the speed, force, and sometimes the direction of the wind. It can be cup or pressure tube anemometers....

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

Particles such as pollen, grass seeds, or dust in the air that cause allergies and are transported by winds.

The term used for turbulence occurring in the absence of clouds or cloud-like elements in the visible area. It is often observed...

A fixed potential temperature line on adiabats, or the process of thermodynamic changes within a system without any exchange...

A periodic warming of sea surface temperatures in the central and eastern Pacific Ocean, significantly influencing global...