MAMMATUS clouds are most often associated with the anvil cloud & severe thunderstorms. They often extend from the base of a cumulonimbus but may also be found under altocumulus, altostratus, stratocumulus, & cirrus clouds as well as volcanic ash clouds^
In every storm, there is a rainbow visible somewhere because there is always light nearby. In the storms of life, there is always something beautiful because God is nearby. We just need to take the time to look for our rainbow.