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Definitions (292)
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Core Punch
[Slang], a penetration by a vehicle into the heavy precipitation core of a thunderstorm. Core punching is not a recommended procedure for storm spotting or chasing.
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Cyclonic Circulation
Circulation (or rotation) which is in the same sense as the Earth's rotation, i.e., counterclockwise (in the Northern Hemisphere) as would be seen from above. Nearly all mesocyclones and strong o [..]
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PPINE
Plan Position Indicates No Echoes, referring to the fact that a radar detects no precipitation within its range.
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GLOSSARY OF WEATHER TERMS FOR STORM SPOTTERS/CHASERS
Feel free to print out this glossary for future reference! As of now there's no answering service Dallas to New York to California, or anywhere else really, that offers in-depth information as yo [..]
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ACCAS
(usually pronounced ACK-kis) - AltoCumulus CAStellanus; mid-level clouds (bases generally 8 to 15 thousand feet), of which at least a fraction of their upper parts show cumulus-type development. These [..]
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Accessory cloud
A cloud which is dependent on a larger cloud system for development and continuance. Roll clouds, shelf clouds, and wall clouds are examples of accessory clouds.
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Advection
Transport of an atmospheric property by the wind.
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Air-mass Thunderstorm
Generally, a thunderstorm not associated with a front or other type of synoptic-scale forcing mechanism. Air mass thunderstorms typically are associated with warm, humid air in the summer months; they [..]
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Anticyclonic Rotation
Rotation in the opposite sense as the Earth's rotation, i.e., clockwise in the Northern Hemisphere as would be seen from above. The opposite of cyclonic rotation.
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Anvil
The flat, spreading top of a Cb (cumulonimbus), often shaped like an anvil. Thunderstorm anvils may spread hundreds of miles downwind from the thunderstorm itself, and sometimes may spread upwind (bac [..]
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