 LEXINGTON, MASS., Sept. 03, 2021 GLOBE NEWSWIRE -- A new study shows that the frequency of polar vortex disruptions that is most favorable for extreme winter weather in the United States is increasing, and that Arctic change is likely contributing to the increasing trend. Led by Atmospheric and Environmental Research AER, University Massachusetts Lowell and the Hebrew University of Jerusalem, the study is published in the September 3 issue of Science . AER is a Verisk Nasdaq:VRSK business. 