Dust devils are perhaps one of the most unique Arizona weather phenomena. But why do you see them so often? Here's the science behind the twisters.

Hello, Eos! Recently discovered molecular cloud is believed to be one of the largest structures in the sky and among the closest to Earth and the sun.

Partly cloudy. Very high chance of showers along the coastal fringe, medium chance elsewhere. The chance of a thunderstorm. Winds south to southwesterly 25 to 35 km/h. Large and powerful surf ...