The polar vortex is Earth's frozen guardian—but that guardian is starting to fail. This video dives into the science behind ...

In the atmospheric layer above it, about 10 to 30 miles up, is the stratospheric polar vortex, where every winter a sunlight-starved Arctic spins up a mass of cold air that, ultimately, dissipates ...

The phenomenon won’t last long though. Thunderstorms moving in Saturday are expected to push the dust back out. The threat of those storms is strongest for the upper half of the North Texas region.