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This is the sequence of events that an observer would see as a warm front approaches:
First, cirrostratus clouds are seen high in the sky. Over the next few hours the clouds become lower and thicker. Cirrostratus clouds block out the Sun only slightly, creating a halo effect around it. As lower, thicker clouds appear, the Sun is more hidden. Altostratus clouds produce a watery-looking sky, then finally, stratus clouds
obscure the sky completely.
If a large amount of air is lifted
up behind the front, the cloud formed in the air above the front will be very thick and dark grey. It will be nimbostratus cloud and rain will fall from it.
(See: Depression.)
Warm temperate climate
Where there is rain at all times of the year and where there are
seasons based on temperature, but in which there is no cold season (no month with temperatures below 6°C). Also sometimes called a subtropical climate. Warm temperate climates on the eastern coasts of continents get their maximum rainfall in summer; those on the western coasts get their maximum rainfall in winter and are called Mediterranean climates. Warm temperate climates can also experience monsoons.
Warm temperate climate
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