Weather - Clouds - Cirrus
![Weather Weather](../img/weather_001.jpg)
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Cirrus Clouds
![Weather Weather](../img/weather_clouds_cirrus_001.jpg)
Cirrus is formed at higher levels. Although these clouds look windswept they change their shape very slowly by comparision with water clouds. Below is a wave cloud. In the distance is a more continuous layer of fibrous ice cloud called cirrostratus.
![Weather Weather](../img/weather_clouds_cirrus_002.jpg)
On the left is feather or leaf like cirrus. On the right is lines of cirrus along the wind. Across these and at a lower level are striations across the direction of the wind.
![Weather Weather](../img/weather_clouds_cirrus_003.jpg)
Contrails (aircraft condensation trails) may be spread over the sky to form a layer of artificial cirrus. Below, dust rising from a power station can be seen showing the artificial thermals.