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post #3 of (permalink) Old 10-29-2011, 05:28 PM
wrathfuldeity
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Or could skunk it. IDK a damm thing about weather...but it seems that the jet stream really determines who gets hit in pnw/wc and iirc there are times where it splits...idk if the arctic oscillation figures in this.

from noaa...“There is a wild card, though. The erratic Arctic Oscillation can generate strong shifts in the climate patterns that could overwhelm or amplify La Niña’s typical impacts.”

The Arctic Oscillation is always present and fluctuates between positive and negative phases. The negative phase of the Arctic Oscillation pushes cold air into the U.S. from Canada. The Arctic Oscillation went strongly negative at times the last two winters, causing outbreaks of cold and snowy conditions in the U.S. such as the “Snowmaggedon” storm of 2009. Strong Arctic Oscillation episodes typically last a few weeks and are difficult to predict more than one to two weeks in advance.


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