Cumulonimbus Clouds Cumulonimbus clouds are much larger and more vertically developed than cumulus clouds which form in a more stable atmosphere. They can exist as individual towers or form a line of towers called a squall line often present at cold fronts.
Sam Sheppard was an American physician best known as a homicide suspect in his wifeâs murder.
Shepard served as Chief of the Astronaut Office from November 1963 to July 1969 (the approximate period of his grounding), and from June 1971 to August 1, 1974 (from his last flight to his retirement).