Cumulus humilis clouds in spring over countryside. Cumulus clouds typically occur under 2000 metres altitude. They form from water vapour in rising columns of air which condenses as it cools. Cumulus clouds often form at cold fronts where the advancing, cool air forces warm air upwards. The humilis variety occurs either as the first stage of the formation of other cumulus types, or when heat transfer (convection) in the atmosphere is weak. Due to its shallow depth, cumulus humilis does not produce any significant weather. Photographed in the mid-afternoon in spring, over Watership Down, Hampshire, UK. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / STEPHEN BURT |
Bildgröße: | 4827 px × 3620 px |
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