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Cumilonimbus clouds do not form in tornadoes; tornadoes formin in cumulonimbus clouds. A cumulonimbus cloud forms when a warm, moist pocket of air rises and the moisture in it condenses, releasing heat that keeps the air rising. This is what drives any thunderstorm. Under the right conditions, the storm my start to rotate, and this rotation may eventually lead to the formation of a tornado.
If you're talking about the basic water cycle, starting in the ocean, water evaporates into vapor (Evaporation) rising up until it reaches it's the dew point, then the water condenses and travel towards higher ground, sometimes it travels as far as sea level ground (Condensation), when it reaches that heavy point where the clouds is too heavy to carry the water it drops taking about 10-15 minutes from the clouds to reaches the surface of the Earth if clouds are in the strato zone (Precipitation).
The clouds play a role similar to the ozone layer. Ultra violet radiation coming from the sun strikes the clouds and the ozone layer and is repelled back into space allowing only "safe" light waves to hit the Earth. The ground absorbs heat, and then releases it. The rising heat reaches the clouds and is reflected back down to the Earth.
To say clouds defy gravity would be misleading, as they do not defy gravity. However rising air currents keep the clouds in the air. The air currents are stronger than the rate at which gravity makes the rain fall (which is not that fast). Clouds are so light, that even the smallest upward air current can make a clouds stay up. Rain falling is basically when the mass of the drops exceed the air currents.
Water evaporates from the oceans rising up into the atmosphere where it condenses forming clouds.
The rising of hot air during the day which condenses to form the clouds. When the clouds become heavy, they fall as rainfall.
Clouds are formed by rising pockets of warm air with water vapor in them. The water vapor then condenses, forming the cloud. Cumulonimbus clouds are just very large clouds that produce thunder-storms. Cirrus clouds are formed when the condensed water vapor freezes, giving the clouds a wispy look.
Rising air contains water vapour which condenses as the air cools with altitude.
The evaporated water forms clouds.
Because that is exactly how it works and these are both everyday and scientific terms! The water is evaporated by the Sun's heat from the sea and lakes, is blown by winds over the land, rising as it does so until it reaches a point at which it condenses, initially forming clouds of microscopic droplets then precipitation.
Condensation occurs on the windward side of a mountain. The rising air cools so the air becomes saturated and the water vapor condenses and causes it to rain.
Changes in the barometric pressure indicate a change in the weather. A rising barometric pressure usually indicates clear, stable weather.
rising air expands then cools and condenses
evaporation
Cumulonimbus, or thunderstorm, clouds form from rising moist air.
water vapor, which then condenses as it cools with the rising altitude and falls as rain