Last winter we saw a fairly strong El Nino (warmer-than-normal sea surface temperature) event over the equatorial Pacific.  Now things have changed, and a moderate La Nina (colder-than-normal) is developing.  In the Midwest, El Nino usually brings about milder winters…although last winter was an exception to that…La Nina typically means colder winter weather.  Here’s a link to learn more…

http://www.cpc.noaa.gov/products/analysis_monitoring/enso_advisory/ensodisc.html

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