Going farther into the extended forecast, the system that passes
Wednesday night may be the first push at really changing the long
wave pattern over North America. As that system`s mid-level
reflection pushes toward northern Quebec by the end of the week, a
potential Fujiwhara interaction seems set to occur as a sub-490 dam
500 hPa low begins to amble southward from the far northern islands
of Nunavut toward the eastern Northwest Territories. GEFS ensemble
forecasts for teleconnection patterns offer some suggestion of a
pattern change going into December, with the NAO and AO trending
negative. All the while cold air will be pooling across much of
Canada, so if the high latitude pattern changes do indeed start to
influence the mid latitudes, a colder pattern may be on the horizon.