"Cap" on top of a cumulus cloud be a thunder-storm

WeathernaturePublished: March 31, 2018Updated: April 3, 2018
Published: March 31, 2018Updated: April 3, 2018

A three-minute video in real time shows a cumulus cloud with a "cap" on top. And this "cap" is also a cloud of vertical development, called pileus, which can be translated from Latin as a small light cap. "Pileus" is usually formed over cumulus and cumulonimbus clouds and is formed due to the rise of dry air at altitudes, which has a higher level of condensation, in contrast to the underlying humid air in the area of ​​a cumulus or cumulonimbus cloud. Therefore, pileus looks like a "hood" or "cap" over a cumulus cloud, rapidly changing its shape. By the presence of pileus, it can be judged that in the clouds of convection, strong ascending air currents have formed, which can form cumulonimbus clouds. Thus, "pileus" can be considered indicators of an early thunderstorm.

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