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THIS is the reason that we shouldn't stand under trees in a thunderstorm!

Natural Lightning Hitting a Tree

"Mammatus clouds are most often associated with the anvil cloud and severe thunderstorms. They often extend from the base of a cumulonimbus, but may also be found under altocumulus, altostratus, stratocumulus, and cirrus clouds, as well as volcanic ash clouds. When occurring in cumulonimbus, mammatus are often indicative of a particularly strong storm or perhaps even a tornadic storm."

Rocky Mountains, Colorado...double rainbow

6/14/2005 lightening and storm clouds