During the 1970s, deep jet stream dips were blamed on global cooling
Scientists are much smarter now, and blame jet stream dips on global warming.
Cornell and Rutgers researchers report in the March issue of Oceanography that the severe loss of summertime Arctic sea ice — attributed to greenhouse warming — appears to enhance Northern Hemisphere jet stream meandering, intensify Arctic air mass invasions toward middle latitudes, and increase the frequency of atmospheric blocking events like the one that steered Hurricane Sandy west into the densely populated New York City area.
More storms like Sandy? Arctic ice loss amplified Superstorm Sandy violence
It makes perfect sense that the record snow and cold during Sandy was due to an overheated atmosphere.