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A warming Arctic produces weather extremes in our latitudes

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 Atmospheric researchers have now developed a climate model that  accurately depicts the winding course of the jet stream,  the powerful band of westerly winds over the middle latitudes, which push major weather systems from west to east. Sea-ice retreat & the accompanying increased activity of atmospheric waves are creating a significant, ozone-amplified warming of the polar stratosphere. Since the low polar temperatures form the jet stream's motor, the rising temperatures in the stratosphere are causing it to falter. In turn, this weakening of the jet stream is now spreading downward from the stratosphere, producing weather extremes. This new combo-model now shows that the jet stream's wavelike course in winter & subsequent extreme weather conditions cold air outbreaks in Central Europe and North America are the direct result of climate change.'

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I began teaching in 1963,; Ba and BS in Education -Brooklyn College. I have the equivalent of 2 additional Master's, mainly in Literacy Studies and Graphic Design. I was the only seventh grade teacher of English from 1990 -1999 at East Side (more...)
 

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Susan Lee Schwartz

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For years, climate researchers around the globe have been investigating the question as to whether the jet stream's winding course over the Northern Hemisphere -- observed with increasing frequency in recent years -- is a product of climate change, or a random phenomenon that can be traced back to natural variations in the climate system.

But these days, as observations confirm, the winds are increasingly faltering. They less often blow along a straight course parallel to the Equator; instead, they sweep across the Northern Hemisphere in massive waves. In turn, during the winter these waves produce unusual intrusions of cold air from the Arctic into the middle latitudes -- like the extreme cold that struck the Midwest of the USA in late January 2019. In the summer, a weakened jet stream leads to prolonged heat waves and dry conditions, like those experienced in Europe in e.g. 2003, 2006, 2015 and 2018.

Submitted on Wednesday, May 29, 2019 at 11:18:58 AM

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and thus..

Yesterday: A tornado warning startled the New York region, where thunderstorms caused severe disruptions. Severe weather batters the U.S., Tuesday set a record as the 12th consecutive day with at least eight tornado reports, according to the National Weather Service. More than 500 tornadoes have been reported in a 30-day period, an unusually high number if the reports are verified.The cause is the combination of a high-pressure area over the center of the country, pulling warm, moist air from the Gulf of Mexico, and a trough trapped over the Rockies. (Climate change is increasingly linked to extreme weather, but limited data has made it difficult to determine whether rising temperatures are making tornadoes more common.)

Another angle: Storms caused the Arkansas River to flood late last week, and left the town of Braggs, Okla., nearly surrounded by water. "We're just blocked off from civilization," one resident said.




Submitted on Wednesday, May 29, 2019 at 11:23:10 AM

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Good article about a not good situation. Wish something could be done about global heating.

Submitted on Wednesday, May 29, 2019 at 8:36:17 PM

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