... the sky is usually cloudless in the morning?
Clouds are formed when moist air is carried aloft by warm air currents rising from the earth's
surface during the day. When this air reaches high altitudes where the temperature and barometric
pressure are lower than at the earth's surface, the moisture comes out of the rising air and forms the water
droplets we see as clouds. These clouds are very short-lived, though, and they usually disappear within
minutes after they are formed as their water droplets mix with drier air and evaporate. Thus, during the
daytime, clouds are continually being formed and then evaporated.
At night, when the surface of the earth cools, the cloud-producing process cuts off. The existing
clouds continue to evaporate, but they are not replaced by new ones. The result: cloudless skies in the
morning.
Do you have any questions you've been wondering about?
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