Except for March every month of 2018 so far has produced an exceptional positive phase of the North Atlantic oscillation. Implied is residence of a strong polar vortex in the higher latitudes biased toward northeast Canada and Greenland much of this year. That pattern is about to change abruptly as a high latitide/high pressure ridge evolves over Greenland which will affect northern hemisphere mid-latitude climate the last third of November.
El Nino warming of the East Pacific is with us but the atmosphere is not reacting. The result? Near-record snow cover across North America and an incoming cold U.S. pattern. Why is the coupling of the atmosphere to El Nino warming NOT occurring?
An intra-seasonal migrating tropical feature known as the Madden Julian oscillation representative of a massive area of tropical thunderstorm activity was tapped by a low pressure system south of France on November 2 making the attendant storm much stronger and causing widespread damage including 17 deaths across Italy.