Low clouds 2

Cumulus clouds are cauliflower-like clouds whose contours change constantly. Cumulus clouds can have slight or extensive height. With little vertical growth, these clouds indicate fair weather. With a large vertical extent, these clouds are associated with heavy showers and gusty winds.
Cumulonimbus clouds are heavy dense storm clouds with large vertical extent – up to 13 miles. These clouds are also called thunderheads, and bring heavy rain, lightning and gusty surface winds. They should be avoided. In certain conditions tornadoes or water spouts can be expected.