Frigid February: Polar vortex poised to bring ultra-cold air to Canada, U.S.

The Midwest and East Coast endured a record cold end to 2017 and start of 2018. Residents there should get ready to do it again, while those living in normally cold places, like the Arctic and Alaska, should prepare to see their weather flip back to much above average temperatures, along with the havoc wreaked by melting ice and snow at this time of year. 

SEE ALSO: 2017 was one of Earth's top 3 hottest years on record, which should come as no surprise

To get a sense of weather conditions in the long range, meteorologists use ensemble models, which consist of a computer model that is run many times with varying initial conditions each time. Those models now show a remarkable consensus between the ensembles of two major computer models that forecasters use, the Global Forecast System, or GFS, and the European Model, known as the ECMWF.  Read more...

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