Literally, in order for a vortex to be classified as a tornado, it must be in contact with the ground and the cloud base. Weather scientists haven't found it so simple in practice, however, to classify and define tornadoes (per this essay by Doswell).
Bikini Island, 2015. Credit: Emlyn Hughes. (Phys.org)âA team of researchers from Columbia University in New York has found that all of the Marshall Islands involved in nuclear tests by the U.S. are now habitable, except for Bikini Atoll.
Bikini Atoll. Bikini Atoll is part of the Micronesian Islands and was the location of 23 U.S. atomic bomb tests from 1946 through 1958. The Bravo test in 1954 was the most powerful bomb the U.S. ever detonated â it was much more destructive than predicted and resulted in widespread radioactive contamination.