This website may use up to three names for a cloud. However, It is perfectly correct to call a cloud only by its first name. The second and third names add to the cloud description and may be used if you choose.
Clouds of Great Vertical Extent
1,000 to 60,000 feet
Clouds of great vertical extent are a special case of cumulus. The cloud bases may be near the surface and extend to near 60,000 feet. Bases are typically around 3,000 feet but it varies with the location and climate. Bases may be lower where more moisture is present. In drier climates the bases may be in the middle levels, above 6,500 feet. If the base is below 6,500 feet it is classified as a low cloud regardless of how tall it is. If the base is between 6,500 and 20,000 feet it would be a middle cloud.
Cumulus congestus and cumulonimbus
Clouds of Great Vertical Extent include various forms of cumulus congestus and cumulonimbus. Their vertical height must extend through at least two layers; low and mid-level or mid-level and high level. Examples of cumulus congestus are also found in the cumulus section of Low Clouds.
These cumulus have reached the cumulonimubs stage but have not formed an anvil yet. There was rain falling from the clouds in the center and left side of the photo. There was lightning associated with both clouds.
Cumulonimbus anvil. This is the top of the cumulonimbus. The top of the storm has reached its maximum altitude and is spreading out into the shape of a blacksmith’s anvil.
Cumulonimbus base. Notice the rain falling from the storm on the right. To know this is the base of a cumulonimbus requires understanding the situation. Observing other clouds, noticing the rain, and seeing lighting or hearing thunder are other clues.
Cumulus congestus
Cumulonimbus
Cumulonimbus
