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.
A woman named Liijabor from Likiep Island, Likiep Atoll in the Marshall Islands, wears a traditional nieded or clothing mat circa 1918. Before the advent of Western influence, the Bikini islanders' sustenance-based lifestyle was based on cultivating native plants and eating shellfish and fish.