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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

Rain clouds form when clusters of water droplets and crystallized, frozen water accumulate at high altitudes, and gravity causes this condensed water to fall as rain. The average size of one of these cloud droplets is mi... More »

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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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Cumulonimbus clouds, also known as thunderheads, release hail and rain in conjunction with updrafts. Ice crystals ride such updrafts into the air and then fall through the clouds, collecting water droplets as they drop. ... 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

Clouds that produce precipitation as rain or snow are called frontal cirrostratus, altostratus and nimbostratus clouds. Nimbostratus clouds produce the most intense precipitation but don't produce all the elements that c... 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