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

This fog is forming because a strong inversion is in place, trapping cold air and moisture near the ground. Valley locations ...

Warmer temperatures and abundant sunshine continue to build across the Pacific Northwest this week, but sensitive groups ...

A ridge of high pressure will be centered over the region through the weekend, continuing a pattern of quiet, stable and ...

High pressure overhead is diverting clouds and wet weather to our north. Under this high pressure, a bit of an inversion is ...

Dense to very dense fog seen during early morning hours, drastically reducing visibility on major roads and highways ...

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

A persistent inversion layer trapping freezing fog across the Rogue Valley has significantly reduced morning visibility, yet ...

Dense Fog Advisory issued for western Idaho's Treasure Valley as strengthening inversions trap cold air and create hazardous ...

Roads could be slick in the morning with very low visibility in the Columbia Basin, Yakima and Kittitas Valleys through the ...

The department says these roads are not meant for that kind of traffic ...

KOIN 6 Chief Meteorologist Josh Cozart explains why Portland's temperature inversion is causing poor air quality across the ...