0544 GMT February 22, 2019
They’re right, and climatologist Kenny Blumenfeld can explain why.
Five or six decades ago, the polar vortex — the thick mass of cold low-pressure air that swirls counterclockwise around the North Pole — would spill bone-chilling air down to Minnesota every two to three years.
“This one is as bad as we’ve had in three decades,” said Blumenfeld, senior climatologist in the Minnesota State Climatology Office.
And for anyone who developed doubts about global warming in last week’s deep freeze, Blumenfeld said not so. In his mind, the data demonstrate that climate change is real: Decades have passed since Minnesota trudged through its last extreme deep freeze.
“These used to be much more regular occurrences,” he said.