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supercell

[soo-per-sel]
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noun Meteorology.
  1. a highly organized thunderstorm that can last for several hours, capable of producing both updrafts and downdrafts exceeding 100 miles per hour, large hailstones, tornadoes, and flash flooding (often used attributively): a supercell in Kansas City; supercell storms.

Origin of supercell

First recorded in 1960–65; super- + cell1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018