The strongest polar vortex on record as defined by the arctic oscillation and especially the North Atlantic oscillation indices has occurred in 2018. +AO/+NAO contributed to the 4th warmest warm season on record for the U.S. and also caused historical Europe drought. Now...due to seasonality...the strong polar vortex is producing record early season snow cover across Canada enabling cold air generation infiltrating the U.S. pattern. Meanwhile immense equatorial subsurface warming is ready to ignite what may be a strong El Nino. The warming influence of El Nino will clash the chilly polar vortex regime by late autumn in North America causing more extreme climate.