Arctic Air Brings Lots of Snow to the U.S.

Photo by Debbie Johnson
Snow and low temperatures have gripped many parts of the U.S. this winter.  This is contrary to the expected conditions based on below average sea-surface temperatures in the equatorial pacific, or a La Nina event.  With a La Nina, the expectation is below average precipitation and above average temperatures. However, other variables can affect the weather. In this case, a change in arctic pressure is pushing cold air deeper into the U.S. 

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