Why Icy Plumes Flare Ahead of Supercell Storms

Something strange often happens just before a severe thunderstorm produces a tornado, high winds, or hailstones: A plume of ice and water known as an Above-Anvil Cirrus Plume (AACP) billows up above the top of the storm clouds and head downwind, acting as a sort of early warning system for extreme weather events.

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