Any time the droplets in clouds grow and come together to form drops that are large enough to create a speed of falling that is greater than the speed at which the cloud is blowing upward, then they head downward, and if they make it down without evaporating, people on the ground experience them as rain or snow. Sometimes rain evaporates again and heads back up into the clouds. The greater the amount of water vapor under the cloud and the stronger the winds on the updraft, the more likely precipitation becomes.Know More
If there are clouds out and about but no rain, then the cloud lacks enough water vapor to form the precipitation or the cloud doesn't have enough rising motion inside of it. When air masses are warmer, rain usually takes place inside localized clouds featuring harder updrafts. When air masses are cooler, rain or snow happens within low pressure zones hosting larger cloud systems, generally appearing at the edge of cold and warm air masses.
Because the Earth is a closed system, the precipitation that takes place each year equals the amount of evaporation. Rain or snow always begins as water vapor that evaporates upward from the planet's surface.Learn More
Precipitation forms when condensation inside clouds occurs at the level that the droplets become heavy enough to fall down to the Earth's surface. Rain, hail, freezing rain, snow and sleet are all types of precipitation that result from different conditions in the atmosphere.Full Answer >
As of 2014, the rainiest place in the world is Mawsynram, Meghalaya State, India, with about 467 inches of rainfall every year. This small mountain community is soaked during monsoon season every year, with about 90 percent of their annual rainfall falling at that time.Full Answer >
Rain and other forms of precipitation occur when water accumulates in the clouds and falls to the ground. This occurs due to the water cycle, which continually recycles the water on Earth.Full Answer >
Rain occurs through the process of coalescence, where a mass of water droplets gathers around cloud condensation nuclei to saturate the atmosphere and allow condensation and precipitation to take place. This process is driven by three primary lifting mechanisms that cause the upward movement of air.Full Answer >