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.
The people of Bikini were convinced to move, believing they'd be able to return after the tests were over. 1  3. Enewetak in the Republic of the Marshall Islands. 2  Between 1948 and 1958 more than forty nuclear tests conducted at Enewetak.