Dense fog will linger through the late morning and early afternoon Wednesday in the metro & valley. It will be significantly ...

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 ...

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

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 ...

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

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

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

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

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

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