A cloud which forms a towering mass that has a dark base and flat top. Under the base, there are frequently low, ragged clouds. These clouds produce heavy rains, thunderstorms, or hailstorms.

CUMULONIMBUS: "Cumulonimbus is characterized by large, dense towers that can reach great heights. "

Link to This Definition

Did you find this definition of CUMULONIMBUS helpful? You can share it by copying the code below and adding it to your blog or web page.
Edited and fact checked by Pam: Google +