Cirrus – High level cloud. Thin wispy structure.
Cumulus – Low level cloud. Fluffy white cotton ball shape.
Stratus – Commonly low level. Sheet or layer of cloud. Hazy white or gray mass.
Nimbo-form – Rain clouds.
- Nimbostratus – Stratus cloud which have precipitation.
- Cumulonimbus – Thunderstorm clouds. Cumulus with precipitation.