The image of what is called a supercell thunderstorm cloud looks like a giant portal in the sky that opened up to drop an ocean of water on that one spot west of Glasgow, Montana, USA. This was photographed last July and thankfully the storm did not really cause damage. It lasted several hours. Such storms are centered on a mesocyclone, a rotating updraft spanning a few kilometers, delivering torrential rains, high winds and tornadoes. On the edge of the supercell are jagged sculptured clouds while dust and rain come from the center.
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