Study: cold-season temperature variability has significantly decreased over the mid- to high-latitude Northern Hemisphere in recent decades

I really like “What’s Up With That’s” data.

Watts Up With That?

This is one of the reasons severe weather has been on the decrease. Less variance means less mixing, and mixing of extreme temperature differential air masses is what contributes to volatile weather events like tornado outbreaks.

EF3-EF5

Source: http://www1.ncdc.noaa.gov/pub/data/cmb/images/tornado/clim/EF3-EF5.png

Here is the paper:

Arctic amplification decreases temperature variance in northern mid- to high-latitudes  

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Posted in AGW