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^
Never really gets cold enough for this where I am, but it looks like a great idea. Tabletop Fireplace: Perfect for a smaller house or apartment without room for a fireplace or even for a little potbelly stove.
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