December outlook: When will we know if Oregon is in for a La Niña winter?

Weather watchers might be wondering: When will we be certain that this winter is a La Ni winter? As late October intensifies and bomb cyclones and air rivers pour rain to the Pacific Northwest.

According to the Climate Prediction Center of the National Weather Service, there is a 57% likelihood that a La Ni trend will form as of November 14.

Oregon weather

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