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Low Clouds | Mid-Level Clouds | High Clouds | Rain Clouds | Activity
High Clouds
Cirrus Clouds 
Cirrus clouds are thin, wispy clouds blown by high winds into long streamers. They are considered "high clouds" forming above 6000 m (20,000 ft). Cirrus clouds generally mean fair to pleasant weather.
(Left: K.Meymaris, Right: UCAR)
Cirrocumulus Clouds
Cirrocumulus clouds appear as small, rounded white puffs. The small ripples in the cirrocumulus sometimes resemble the scales of a fish. A sky with cirrocumulus clouds is sometimes referred to as a "mackerel sky".
(Left: L.Gardiner, Right: UCAR)
Cirrostratus Clouds
Cirrostratus clouds are thin, sheetlike high clouds that often cover the entire sky. They are so thin that the Sun can be seen through them and a halo will be visible around the Sun. The picture at the left shows the halo. The Sun has been blocked to photograph the halo. (Remember to never look directly at the Sun!)
(Left: P.Lemone, Right: A.Pharamond)
