The Nebraska region is currently in a weak La Nina and that is expected to stick around for the winter. The area is also still in a negative phase of the Pacific Decadal Oscillation (PDO). The analogs are based largely on this combination, though other factors and teleconnections may play an even bigger role for our sensible weather this coming winter. Siberian snow cover in the fall can have a big impact on the strength of the polar vortex, as one example.  Warm November Favored It has been a very warm October for this region of the country. For some...Article Link

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