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.
Hawai`i: Hawaii is the largest of the habitable Hawaiian islands and covers 4,038 square miles. This island was formed by five volcanoes, two of which are still active. Kohala is on the northern side of the island. Hualalai is in the west. Mauna Kea and Mauna Loa are toward the center of the island.