Dense fog advisory issued for Treasure Valley as stagnant high-pressure system creates multi-day fog pattern with cooler ...

High pressure will keep the Northern Rockies under a stagnant weather pattern through early next week. Expect valley fog, low ...

Quiet weather will persist through early next week. Mornings will stay cold, and inversion conditions could affect air ...

The Arctic blast will drop temperatures to well below average in the central and eastern U.S. as far south as Florida, ...

The National Weather Service released a freezing fog advisory at 12:04 p.m. on Wednesday valid from 10 p.m. until Thursday ...

On Wednesday at 11:03 a.m. an updated air stagnation advisory was issued by the National Weather Service in effect until ...

The bottom line? A big ridge of high pressure has set up shop across the western U.S. leading to inversion haze, bad air quality, and cooler valley temperatures.

Inversions will continue this week with decreasing air quality, especially along the Wasatch Front. Slight improvement is ...

High pressure remains in place with valley inversions setting up. Valley fog and cooler air will remain in the lower ...

A dry and stagnant weather pattern is locked in place today, bringing low clouds and fog to many of our valleys.

Sunny and mild for the coast and higher elevations Wednesday. Some westside valleys will continue to deal with clouds and fog ...

KOIN 6 Chief Meteorologist Josh Cozart explains why this week's temperature inversion is reducing Portland's air quality.