What is Clear?
Observation of the sky from the observer's location where there are no clouds, and there is no obstruction to visibility. Clear sky. In meteorology, this term is also used when the cloud cover is less than 1/8 during the day or at the observation hour.
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A small, intense downdraft that produces damaging winds at the surface, typically lasting a few minutes and often associated...
An instrument used to measure the speed, force, and sometimes the direction of the wind. It can be cup or pressure tube anemometers....
A strong, downward wind caused by a localized column of air sinking rapidly, often resulting in damage similar to that caused...
A towering cloud that often reaches great altitudes and is associated with thunderstorms, heavy rain, and sometimes severe...
The amount of radiation, heat, or light passing through or flowing from a unit area of a surface.
Particles such as pollen, grass seeds, or dust in the air that cause allergies and are transported by winds.
A tropical cyclone, also called a hurricane, is a severe tropical storm with wind speeds in excess of 74 mph. Known as a...
Jet streams are strong, fast-flowing air currents in the upper levels of the atmosphere. They form when warm air masses meet...
Confluence refers to the area where two or more air streams or bodies of water meet and combine. In meteorology, it often...
A weather system refers to the movement of warm and cold air across the globe, usually in a recurring pattern. Systems can...