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Muthumanimaran
- 81
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Raining only occurs when there are dense clouds in the sky, when they are scattered the raining is stopped, why?
russ_watters said:Maybe I misunderstood the question. If he was asking why rain is more likely on very cloudy days than moderately cloudy days, it is because a very cloudy day has more moisture in the sky. On a moderately cloudy day, a cloud has an easier opportunity to dissipate instead of raining.
A cloud is at 100% RH (or greater), which is greater than "almost 100%.davenn said:no, not necessarily ... you can have almost 100% humidity on a sunny summer day and not a cloud in sight. ie. the air/atmosphere is very moisture laden
Agreed.its the concentration of moisture per unit of volume combined with temperature that will cause condensation and then precipitation
russ_watters said:A cloud is at 100% RH (or greater), which is greater than "almost 100%.
Agreed.
Not all clouds are capable of producing rain. The type of cloud that produces rain is called a cumuliform cloud, which is characterized by its large vertical development. These clouds contain enough water droplets and ice crystals to produce rain. On the other hand, stratiform clouds, which are flat and spread out, do not have enough moisture to produce rain.
Scattered clouds refer to clouds that are spread out in the sky with gaps in between. These clouds are not dense enough to produce rain. They may contain small amounts of moisture, but not enough to result in precipitation. Scattered clouds can also be a sign of dry air, which inhibits the formation of rain.
Clouds can dissipate, or disappear, when the air is too dry or stable. In order for rain to form, there needs to be enough moisture in the air and the air needs to be unstable. If the air is too dry, the water droplets will evaporate before they can grow large enough to fall as rain. Similarly, if the air is stable, the rising air that forms the cloud will not continue to rise and the cloud will dissipate.
Yes, it is possible for dark and threatening clouds to not produce rain. These clouds may look like they are capable of producing rain, but they may not have enough moisture or instability to do so. Additionally, the rain may fall from the cloud before it reaches the ground, resulting in the cloud appearing dark and threatening but not producing any rain.
Clouds in a clear blue sky are usually scattered cumulus clouds, also known as fair weather clouds. These clouds do not produce rain because they are not dense enough and do not contain enough moisture. They are a sign of stable and dry air, which is not conducive for rain formation.