Climate

Underlying this is a jet stream gone wild, Maue and Chenard said.

The jet stream is the river of air that moves weather from west to east on a roller coaster-like path. Usually, the plunges are as mild as a kiddie roller coaster. But now that jet stream is barreling down near-vertical, scream-inducing drops, followed by straight-up ascents.

“Which means you get a lot of extremes next to each other,” Maue said. Storm fronts coming from the Pacific hit that high pressure heat dome in the Southwest and are pushed north to climb that mountainous jet stream peak, “grab access to that cold air reservoir up there” and bring it back down south down the other side of the hill, he said.

Numerous studies have connected unusual jet stream and polar vortex activity to shrinking Arctic sea ice and human-caused climate change.