Air Cloud
Cumulus clouds are found worldwide but most common in moist areas. Cumulus convection and clouds form when the cloud base is often less than 2000 m and can amount to 12 miles high, and 6 miles wide. Cumulus clouds are formed within the thermal columns of rising air, their basic marking the level at which condensation occurs, and this explains Why all cumulus clouds in a region have their base at the same height.
Since the thermal velocities vertically pulls air in the air at the base, and air is cooler and dryer. Cloud droplets evaporate, and cloud fragments sink, in this drier air. This prevents cumulus clouds by increasing clouds and stop others from forming close.
If you look out the window on a clear summer morning and discover that there is no cloud to be seen in the sky, and then by mid morning there is a horde of fluffy white clouds marching across the sky, blocking the sun, they will be cumulus clouds. Fluffy and white, looking like cotton wool they quickly across the sky on the wind. Cumulus usually of short duration, they are quickly and disappear quickly.
The warmth of the morning sun makes the ground warmer and therefore mid-morning patches of heated ground overlain by more invisible spots of hot air. This parcel of air will begin to rise and take the moisture, and when it rises it expands (the pressure is lower The higher you are) and it cools and moisture condenses into small cloud droplets, a cumulus cloud.
Sometimes a power station or an industrial chimney will introduce enough moisture in the atmosphere to cause its very own cumulus. As mentioned the clear air around clouds surrounding the pile is an indication of declining air, and the greater the cumulus then the greater the clear air around it. Therefore, a larger than normal blue sky patch may indicate the approach of a sharp shower. A medium-sized cumulus cloud can hold as much as 1000 tonnes in moisture.
But at the end of the day, when the sun begins to lose the power of the convection heating will end, and the cumulus clouds slowly drift, fade and disappear.
In short, the word "cumulus" comes from the Latin word for a mountain or a stack, and this aptly describes their appearance. They usually do not last very long, and not reach to great heights (unlike, for example, Cumulonimbus). Cumulus clouds are a good indication of good weather, with perhaps the odd sharp, brief shower. And finally, they are more prominent in summer when convection is at its greatest. About the Author:
Mark Boardman BSc dip.hyp is a leading author and expert on world weather. For more information about cumulus clouds, feel free to visit these sites.
Article Source: ArticlesBase.com - Cumulus Clouds the Small Fluffy Ones
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