“The weather patterns that steered deadly Superstorm Sandy into the East Coast last year may be on the decrease, thanks to rising levels of greenhouse gases in the atmosphere,” states the press release for a study published today in Proceedings of the National Academy of Sciences. The release continues:
While the atmospheric conditions that pushed Sandy into the New Jersey coast in October 2012 will still occur in the North Atlantic, a team of researchers led by Elizabeth Barnes, assistant professor in the Colorado State University Department of Atmospheric Science, has found that those conditions will occur less often, making it less likely that any future superstorms that form will be steered into the United States.
“Using state-of-the-art climate models, we project that there will be a decrease in the frequency and persistence of the westward flow that led to Sandy’s unprecedented track,” Barnes said. “That implies that future atmospheric conditions are less likely than at present to propel tropical storms westward into the coast.”
Two anomalous weather patterns slammed Sandy into the Northeast, according to Barnes. First, the jet stream shifted toward the south. Second, a “wave breaking” and blocking event in the upper atmosphere blocked the normal west-to-east wind, “causing the wind to blow back towards North America rather than out to sea.” When Sandy “met the block and the westward wind flow, it accelerated toward the New Jersey Coast with winds in excess of 80 miles per hour.” In the PNAS study, “the models show a lessening of the frequency of the breaking-and-blocking pattern with a poleward shift of the jet-stream in the future, and that this is found for the Southern Hemisphere as well.”
There may be no greater heresy in this enlightened age than the notion that global warming will avert weather disasters. But there’s evidence it has already begun.
In June, Cato Institute climatologist Chip Knappenberger, in a column on MasterResource.Org, described several “Billion Dollar Weather Events Averted by Global Warming.” Not unlike the Barnes PNAS study, Knappenberger found that wind patterns “consistent with” global warming prevented two tropical storms from developing into full-blown hurricanes and prevented two others from hitting the U.S. East Coast. Here’s an excerpt: [click to continue…]










