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in the upper atmosphere is cooled more by the evaporation of some of the rain and melting of the frozen precipitation pushed up into the high levels of the towering cumulonimbus (thunderclouds). That cold air becomes much denser than the surrounding air and literally falls to the ground, accelerating like any other falling body.
NASA's Aqua satellite flew over the derecho on June 29 and June 30, using the Atmospheric Infrared Sounder instr.
"The huge blob of very cold air from the upper atmosphere has a higher forward wind speed since it is high in the atmosphere, " Witte said. "This gives the 'blob' great forward momentum. Add that speed to the falling speed and the result is a very powerful forward moving surface wind. "The process of a derecho can become self sustaining as Adidas Crazy Explosive Andrew Wiggins Home Pe
wind flows: the downburst winds from very high altitudes, and the forward speed of the storms. A downburst occurs when cold air Adidas Shoes For Men Casual 2018
and a consultant to NASA Headquarters, Washington. "That is why they are relatively rare: not all the elements line up that often. "Witte said that one could think of the strong winds as a combination to two main Adidas Shoes For Girls Low Tops
29 at 1432. By 1602 UTC, they appear as a rounded area south of Lake Michigan. By 2132, the area of the derecho's clouds were near Lake Erie and over Ohio expanding as the system track southeast. By 0630 UTC, the size appears to have almost doubled as the derecho moves over West Virginia, Maryland, Pennsylvania and Virginia. EDT), the Derecho was over the mid Atlantic bringing a 100 mile line of severe storms and wind gusts as high as 90 mph to the region. "It is interesting how the process is a self sustaining process that is fed by a combination of atmospheric factors that all have to be in place at the same time," said Joe Witte, a meteorologist in Climate Change Communication at George Mason University, Va.
hot and humid air is forced upward by the gust front and develops more (reinforcing) towering clouds. When one adds in a rear low level jet stream, there is nothing to Adidas Sneakers For Ladies stop the repeating process.
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