Cumuliform clouds are clouds that are comprised of water droplets and
that often develop vertically. The density of the droplets can block sunlight,
causing shadows. They are often associated with convection with increasing vertical height. Bases of these clouds are generally no more than 3,000 feet above the ground, but they can develop past the troposphere in the Gulf region. They are classified as low clouds and include all varieties of cumulus and cumulonimbus. They contrast with stratiform clouds which develop horizontally.