All coverage
A Closer Look at the Polar Vortex's Dangerously Cold Winds (Published 2019)
By Jeremy White, Karthik Patanjali & Yuliya Parshina-kottas
Polar vortex: As many as six deaths, USPS delivery suspended, school canceled across Midwest
By Angela Fritz, Amy B Wang & Katie Mettler
Cold Chicago, Midwest weather: US freeze from polar vortex hits mail
By Doyle Rice, John Bacon & Aamer Madhani
Polar vortex: What role does climate change play?
By Justin Rowlatt
Extreme weather is so bad in some parts of the country, even the US Postal Service won't be going out
By Steve Almasy, Christina Maxouris & Holly Yan
Polar Vortex Hits The Midwest With Life-Threatening Cold Temperatures
By Shannon Van Sant
Extreme Cold Weather Spreads East
By Monica Davey, Mitch Smith & Julie Bosman
A Merciless Cold Lingers in the Midwest
By Monica Davey & Julie Bosman
Polar vortex weather sets records, responsible for deaths in several states
By Angela Fritz, Katie Mettler & Cleve Wootson