Occasionally, an elongated ominous-looking cloud forms just behind a gust front. This type of cloud, which appears to slowly spin about a horizontal axis, is called a ____.
A) downburst
B) shelf cloud
C) wall cloud
D) roll cloud

Question

Quizplus · Accepted Answer

The description matches that of a roll cloud, which forms along the leading edge of a cool outflow from a thunderstorm and has a distinct rolling motion. A downburst is a strong downdraft that can cause damaging surface winds. A shelf cloud is a low, horizontal cloud that forms along the leading edge of a thunderstorm and often indicates strong winds. A wall cloud is a vertical, funnel-shaped cloud that forms beneath a cumulonimbus cloud in a thunderstorm and can indicate the potential for tornado development.

Occasionally, an Elongated Ominous-Looking Cloud Forms Just Behind a Gust