Why doesn the rain in a cloud fall all at once?
Don’t make something more complicated than it is. A rain cloud behaves just like the condensation or steam in your bathroom when you have the hot shower running. The steam collects at the top of the room. Just like clouds form up in the sky. A mirror in your bathroom is usually a cooler surface and the droplets from the steam condense and form on the mirror. When a cloud is cooled the water vapor will form water droplets. The lower the temperature goes the more the vapor is condensed to form water droplets or raindrops. Because this temperature change is gradual, the raindrops don’t form all at once. If you could change the temperature suddenly all the rain would form and drop at once. During a severe thunderstorm when the pressure is very low the uplifting effect is extreme and the temperature drop is severe enough to allow the tremendous formation and downpours we experience. As the droplets fall they bump into one another to form those huge raindrops.
