From NASA’s Earth Observatory and MODIS, here’s cloud streets due to double inversion layers warm-atop-cold-atop-warm:
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Dr Marshall Shepherd at Forbes puts the present cold snap in perspective. Dr Shepherd was previously President of the American Meteorological Society.
By the way, the AMS has a new publication, Explaining Extreme Events of 2016 from a Climate Perspective available. They did one like this for 2014, and this is the 2016 edition.
And this is Professor Jim White talking about abrupt climate change and its relation to the Arctic: