These cloud formations were seen over the western Aleutian Islands. Their color variations are probably due to differences in temperature and in the size of water droplets that make up the clouds.

Image: 
IG Type: 
Source: 
Landsat 7
JPG name: 
ALEUTIAN-CLOUDS
TIF name: 
ALEUTIAN-CLOUDS
Scale: 
2.3 miles (3.7km)