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Cumulus humilis
Bråviken, Sweden, August 1999

These are typical summer clouds, even called fair-weather-clouds. They form throughout the day when the sun heats the ground which in turn heats the air which rises and condenses. Early during the day they are quite fluffy but with a flat base and late afternoon they normally collapse and spread out more or can even dissipate.

Cumulus humilis
Harare, Zimbabwe, June 1999

The humilis clouds seen here are not as distinct in their form due to the late hour of the day. Sometimes humilis clouds can collapse into stratocumulus and can cover the whole sky. This actually happened here later on during the late afternoon. (see Stratocumulus Harare)

Cumulus humilis
Southern Algeria, March 1999

Even in a dry environment like here in the Saharan desert, sometimes enough humidity is present to form humilis clouds from the convective movements.

Cumulus humilis
Mekong river, Vientiane, Laos, July 1999

Here the humilis formation is seen in the evening shortly before sunset. Observe the typical flat base of this cloud formation.

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