As the cool air sinks, the warm air rises over the top and traps the cold air below. If you travel from downtown Boise to the ...

The bottom line? High pressure ridge continues to build with declining air quality in northern valleys but rebounding ...

Rare rime ice and ground-level ice crystals form across Boise as deep temperature inversion creates perfect conditions for ...

A rare temperature inversion has flipped Bay Area weather, warming mountain ridges while cold, foggy valleys grapple with poor air quality and low visibility.

A long stretch of humid heat followed by intense thunderstorms is a weather pattern historically seen mostly in and around ...

Inversions are still in place across the northern valleys, leading to more haze, poor air quality, & areas of morning fog.

High pressure in place will contribute to dry, clear skies in the week ahead, while also creating a temperature inversion.

The bottom line? A big ridge of high pressure sets up shop across the western U.S. leading to inversion haze, bad air quality ...