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Oil Risks Worst Losing Run in More Than a Year as Rally Frays

Sumary of Oil Risks Worst Losing Run in More Than a Year as Rally Frays:

  • About 10% of them become severe, meaning they produce hail 1 inch or greater in diameter, winds gusting in excess of 50 knots (57.5 miles per hour), or a tornado…
  • Dennis Cain/NOAA Derechos occur mainly across the central and eastern U.S., where many locations are affected one to two times per year on average…
  • In the West, derechos are less common, but Colorado – where I serve as state climatologist and director of the Colorado Climate Center – experienced a rare and powerful derecho on June 6 that generated winds exceeding 100 miles per hour in some locations…
  • Derechos have also been observed and analyzed in many other parts of the world, including Europe, Asia and South America…
  • Walls of wind Scientists have long recognized that organized lines of thunderstorms can produce widespread damaging winds…
  • Gustav Hinrichs, a professor at the University of Iowa, analyzed severe winds in the 1870s and 1880s and identified that many destructive storms were produced by straight-line winds rather than by tornadoes, in which winds rotate…
  • They proposed that for a storm system to be classified as a derecho, it had to produce severe winds – 57.5 mph (26 meters per second) or greater – and those intense winds had to extend over a path at least 250 miles (400 kilometers) long, with no more than three hours separating individual severe wind reports…
  • Derechos are almost always caused by a type of weather system known as a bow echo, which has the shape of an archer bow on radar images…
  • Although some aspects of mesoscale convective systems, such as the amount of rainfall they produce, are very likely to change with continued warming, it not yet clear how future climate change may affect the likelihood or intensity of derechos….

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