All coverage
A Closer Look at the Polar Vortex's Dangerously Cold Winds (Published 2019)
By Jeremy White, Karthik Patanjali & Evan Grothjan
Polar vortex: As many as six deaths, USPS delivery suspended, school canceled across Midwest
By Angela Fritz, Amy B Wang & Katie Mettler
Polar Vortex Hits The Midwest With Life-Threatening Cold Temperatures
By Shannon Van Sant
Cold Chicago, Midwest weather: US freeze from polar vortex hits mail
By Doyle Rice, John Bacon & Aamer Madhani
Extreme Cold Weather Spreads East
By Monica Davey, Mitch Smith & Julie Bosman
A Merciless Cold Lingers in the Midwest
By Monica Davey & Julie Bosman