A vertically developed cumulus cloud, often capped by an anvil-shaped cirriform cloud. Also called a thunderstorm cloud, it is frequently accompanied by heavy showers, lightning, thunder, and sometimes hail, tornadoes or strong, gusty winds.
CUMULONIMBUS
Meaning of CUMULONIMBUS in English
Weather and meteorology English vocabulary. Английский словарь погоды и метеорологии . 2012