Anomalous Recent Winter Linked to Human Causes

Jeff Masters reports:

From November 2013 – January 2014, a remarkably extreme jet stream pattern set up over North America, bringing the infamous “Polar Vortex” of cold air to the Midwest and Eastern U.S., and a “Ridiculously Resilient Ridge” of high pressure over California, which brought the worst winter drought conditions ever recorded to that state. A new study published this week in Geophysical Research Letters, led by Utah State scientist S.-Y. Simon Wang, found that this jet stream pattern was the most extreme on record, and likely could not have grown so extreme without the influence of human-caused global warming. The study concluded, ‚Äúthere is a traceable anthropogenic warming footprint in the enormous intensity of the anomalous ridge during winter 2013-14, the associated drought and its intensity.”

Paging Roger Pielke Jr.

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