The bases of low-level clouds range in height from the ground to about 6000ft.
Some examples of low-level cloud types:
These clouds often cover the tops of hills or sea cliffs. It is a grey layer of cloud of uniform height, resembling fog, but not resting on the ground. It forms in stable air, which has little or no turbulence. Stratus clouds which move over a hill or along a front may be followed by rain.
When mixture of warm, moist air and dry, cool air moves beneath a warm, light air above, clouds will often form as rolls or waves. This type of cloud is known as Stratocumulus. As the name implies, it is a layer of cloud composed of patchwork of flattened Cumulus, soft in outline and grey in colour. It is a very common type.
They are thick clouds with vertical development. The clouds are usually detached from one-another to form puffy white clouds. The basis are dark while the tops and sides are usually brighter. When they are small and scattered, they are a sign of fine weather.
It is a larger form of a cumulus. When there is no wind, and it is a very hot day, it will be a large mass motionless over a wide area. It is a thundercloud, growing to a level of the tropopause (from 0-17 km(10 miles) high). Thunder, lightning and hail may have their source from this cloud.