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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

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

Cloud condensation nuclei are tiny particles in the atmosphere, such as dust, salt, or pollutants, that provide surfaces...

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

The measure of the water vapor or moisture content in the air, expressed as the mass of water vapor per unit volume of air....

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

Although it is also used for light winds, it is the general name given to the daily cyclical winds that occur mostly between...

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

The jet stream forming the boundary between tropical air and sub-tropical air, characterized by isothermal compression and...

A thermodynamic change process in the system without any exchange of heat or transfer of energy between systems. This process...

A middle cloud type within the B family in the international cloud classification. These are shaded clouds that can be white...