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Dark rain clouds are called stratus clouds. They are rainy, dense, dark or snowy clouds that sometimes appear as white cottony clumps surrounded by blue sky. More »

www.reference.com Science Weather & Tides Clouds

Most commonly, rain clouds that produce a steady rain are referred to as nimbostratus clouds. These clouds appear low in the sky and are a medium to dark gray color. Sometimes stratus clouds are associated with a light d... More »

www.reference.com Science Weather & Tides Clouds

Precipitation occurs when moist air rises to cooler altitudes, condensing the water out of the air into droplets. Once these droplets become heavy enough, often by coalescing around motes of dust or other particles, they... More »

www.reference.com Science Weather & Tides Clouds
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Most commonly, rain clouds that produce a steady rain are referred to as nimbostratus clouds. These clouds appear low in the sky and are a medium to dark gray color. Sometimes stratus clouds are associated with a light d... More »

www.reference.com Science Weather & Tides Clouds

Cumulonimbus clouds produce thunderstorms, blizzards, torrential rain, hailstorms and tornadoes. Though they have a low base, these clouds are very deep, and they can extend miles into the atmosphere. More »

www.reference.com Science Weather & Tides Clouds

Cumulonimbus clouds produce rain, hail and other attributes of thunderstorms. These clouds begin as cumulus clouds that achieve vertical growth. Tornadoes are also a product of cumulonimbus clouds. More »

www.reference.com Science Weather & Tides Clouds

Rain clouds turn gray or black because thick clouds saturated with rain drops scatter sunlight coming through the clouds. When less direct sunlight gets to the bottom of clouds, they appear darker to the human eye. Thin ... More »

www.reference.com Science Weather & Tides Clouds