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When the polar vortex stretches, North America feels the chill. New research reveals some of the stratospheric patterns ...

A detailed analysis of polar vortex collapse mechanisms and how they relate to occasional North American cold outbreaks.

The condition of the polar vortex influences everyday weather around the globe.

When the polar vortex stretches, North America feels the chill. New research reveals some of the stratospheric patterns controlling these cold snaps.

The portion of the state with no drought has more than doubled since early June. See the newest Iowa Drought Monitor map to see where drought remains.

It's almost time to redraw Ohio's congressional map, and Republicans hold all the power to draw more GOP districts headed into competitive national midterm elections.

Once completed the U.S. will be home to the sixth tallest building in the world.