| has gloss | eng: An upper tropospheric cyclonic vortex is a vortex that usually moves slowly from east-northeast to west-southwest, and generally does not extend below 20,000 feet in altitude. A weak inverted wave in the easterlies is generally found underneath them, and they may also be associated with broad areas of high-level clouds. Downward development results in an increase of cumulus clouds and the appearance of a surface vortex. In rare cases, they become warm-core, resulting in the vortex becoming a tropical cyclone. Symbiotic relationships can exist between tropical cyclones and upper level lows in their wake, with the two systems occasionally leading to their mutual strengthening. History of research University of Hawaii Professor James C. Sadler has documented tropical cyclones over the eastern North Pacific that were revealed by satellite observations, and suggested that the upper-tropospheric circulation is a factor of development, as well as the life history of the tropical cyclones. |
