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This is a rare meteorological phenomenon called a skypunch. Ice crystals form above the high-altitude cirro-cumulo-stratus clouds, then fall downward, punching a hole in the cloud cover.

Astronomers Robert Nemiroff and Jerry Bonnell, said: 'These rare long clouds may form near advancing cold fronts. 'In particular, a downdraft from an advancing storm front can cause moist warm air to rise, cool below its dew point, and so form a cloud. 'When this happens uniformly along an extended front, a roll cloud may form. via Claire Bates, #Roll_Cloud #NASA #dailymail 'Roll clouds may actually have air circulating along the long horizontal axis of the cloud.'

Enormous mushroom cloud formed over Beijing last week, sparking fears of cataclysmic, Armageddon-like events was underway. Not the end of the world, just nature. Giant cumulonimbus (thunderstorm cloud that forms from towering cumulus), spanning several miles, was accompanied by lightning, according to National Center for Atmospheric Research. (Xinhua/China Daily) June 18, 2012

Stunning Clouds