Fata Morgana is an optical illusion caused by a temperature inversion. One viewer caught this rare phenomenon along the North ...

It has been a split screen week in Central Oregon — with sunny skies and warm weather at Mount Bachelor, while Bend and other lowland areas have experienced freezing fog and bone-chilling temperatures ...

PORTLAND, Ore. (KOIN) — Oregon’s temperature inversion continues as stagnant air, fog, and chilly temperatures remain across much of the Pacific Northwest on Wednesday. A temperature inversion means ...

Anyone who traveled up to Mount Bachelor and back to Bend over the weekend may have asked: What’s up with the weird weather? Below-freezing conditions across lowland areas overnight left trees coated ...

Parts of the Bay Area are seeing wildly different temperatures thanks to an unusually “dramatic” weather pattern. A ridge of high pressure is causing a major temperature inversion in the Bay Area, ...

Residents awoke to a dense layer of fog blanketing the Treasure Valley on Thursday. Experts say a weather event known as an inversion is to blame for the misty morning — and it’s not going away ...

PORTLAND, Ore. (KOIN) — Warmer temperatures and abundant sunshine continue to build across the Pacific Northwest this week, but sensitive groups should avoid extensive time outside. Air quality ...

A long stretch of humid heat followed by intense thunderstorms is a weather pattern historically seen mostly in and around the tropics. But climate change is making humid heat waves and extreme storms ...

SALT LAKE CITY — This month figures to be one of Salt Lake City's warmest on record as its running average temperature on Wednesday is just a tick below a record set over a century ago. A ...

Winter weather patterns, like temperature inversions, trap pollution close to the ground. Holiday activities such as wood burning and fireworks significantly worsen air quality. Particle pollution can ...