/tags/polar-vortex Polar Vortex en-US Copyright KUNC/Community Radio for Northern Colorado 2020 Wed, 30 Jan 2019 10:45:00 GMT /npr-news/2019-01-30/polar-vortex-causes-midwest-states-of-emergency-as-cold-pushes-farther-south Wind chill warnings stretch from the Dakotas into Western Pennsylvania. Airlines have canceled thousands of flights, and the governors of Wisconsin, Michigan and Illinois have declared emergencies. Wed, 30 Jan 2019 10:45:00 GMT /npr-news/2019-01-30/polar-vortex-causes-midwest-states-of-emergency-as-cold-pushes-farther-south David Schaper