supercell

plural supercells

1. climatologyA severe thunderstorm with updrafts and downdrafts that are in near balance, allowing the storm to maintain itself for several hours. Supercells often produce large hail, powerful downpours, very strong winds and sometimes tornadoes.

   The storm system was a supercell, the kind that brew the deadliest tornadoes and most damaging hail in the United States, said Walker Ashley[…]

   2023 March 25, Oliver Laughland, “‘My city is gone’: ‘supercell’ tornado annihilates Mississippi town and kills 23”, in The Guardian, →ISSN

   1 more example

   They watched the supercell that spawned the F5 killer that struck Oklahoma City spit out one tornado after another. In two cases, the researchers believe, the Dopplers captured tornadoes being formed — including the Oklahoma City monster.

   1999 May 11, William K. Stevens, “Oklahoma Tornado Offers Hints Of How a Killer Storm Is Born”, in The New York Times, →ISSN

2. chemistryA repeating unit cell of a crystal that contains several primitive cells.