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stratus clouds fill the sky during a storm.
They are called "cumulonimbus" clouds, or "anvil" clouds, or more commonly "thunderheads".
Cumulonimbus clouds are storm clouds.
Cumulonimbus clouds are what heaps of rain clouds are called. Vertical clouds are the heaped up ones, so their names include the root " cumulus." The big, towering storm clouds are called cumulonimbus.
tornado clouds
Rain Clouds are dark or light grey sometimes black, clouds that gather when a storm is near.
errm. lightening?
Such a storm is called a tornado.
Cumulonimbus clouds - scientific name for thunderheads (the clouds that produce thunderstorms)
A tornado is formed from storm clouds. The funnel cloud is the tornado before it touches down.
Storm Clouds - 1992 TV was released on: USA: 1992
Actually, clouds are sometimes black. Storm clouds are.