Storm

Neptune once had a huge storm known as the "Great Dark Spot" which was discovered in 1989 by Voyager 2.

A storm is any disturbed state of a body especially affecting its surface, and strongly implying a wind force.

It may be marked by significant disruptions and lightning (a thunderstorm), heavy precipitation (snowstorm, rainstorm), heavy freezing rain (ice storm), strong winds (tropical cyclone, windstorm), or wind.

It transports some substance through the atmosphere as in a dust storm, blizzard, sandstorm, etc.

Storms have the potential to harm lives and property via storm surge, heavy rain or snow causing flooding or road impassibility, lightning, wildfires, and vertical wind shear.

This combination of opposing forces can create winds and result in the formation of storm clouds such as cumulonimbus.