vortex (or Multi-vortex) Tornado - a tornado in which two or more condensation funnels or debris clouds are present at the same time, often rotating about a common center or about each other. Multiple-vortex tornadoes can be especially damaging. See suction vortex.
MULTIPLE
Meaning of MULTIPLE in English
Weather and meteorology English vocabulary. Английский словарь погоды и метеорологии . 2012