The collision coalescence process is the process of cloud droplets increasing in size by colliding and coalescing. When droplets bump into each other, it is called collision, and when they stick together, it is called coalescence.Know More
Cloud droplets must increase in size about a million times in order to become raindrops. Raindrops are formed in warm clouds exclusively by the collision coalescence process. However, this process has little importance in clouds where temperatures are below freezing.
Droplets can only coalesce or combine if they have an opposite electrical charge; otherwise, they simply bounce off one another. As the droplets grow larger and heavier, they begin to fall through the cloud. Larger drops fall faster and collect the smaller drops as they fall, causing the droplets to grow even larger.
Clouds with temperatures below freezing use the Bergeron process to increase the size of droplets. This process was first proposed by Tor Bergeron in the early 1920s. In this process, ice crystals form high in the clouds and increase in size by attracting water vapor. As the ice crystals become large enough to fall towards the Earth's surface, they pass through the lower, warmer portion of the cloud and grow even larger.Learn more about Weather & Tides
Cold fronts result in the appearance of clouds, rain, strong winds and thunderstorms. When these conditions pass, the temperature grows cooler, dropping as much as 15 degrees Fahrenheit within an hour of the cold front's arrival.Full Answer >
Air becomes saturated when it reaches the point at which it cannot hold any more water vapor. When the air cannot hold any more water vapor, the vapor condenses into liquid water and creates dew.Full Answer >
Most fog forms as a result of the combination of moisture in the air and an influx of cool air that causes the moisture to fall below its dew point and condense. Meteorologists consider fog to be a type of a cloud that forms just above the ground.Full Answer >
According to Reference.com, the name of a wind is based on the compass direction from which it blows. For instance, a wind that blows from the north is known as a "north wind." Wind direction is indicated by weather vanes, lightweight, flat pieces of material mounted so they freely rotate in a horizontal plane.Full Answer >