Impact of the winter polar vortex on greater North America International Journal of Climatology

Winter weather in the subarctic and lower latitudes can be influenced by therepositioning of the polar vortex away from being centred near the North Pole, exten- ding over regional locations of subarctic continents. One example was the “Beast from the East ”event in Eurasia in March 2018, which brought snow to much of Europe. We are interested in extended (week to a m onth) North American weather events, and especially the impacts from a location of th e polar vortex centre over and near Green- land. For a tropospheric polar vortex locatio n index, we use low 500 hPa geopotential Grant no. NA15OAR4320063