'Inversion' keeps winter in Portland, brings spring to Mt. Hood

'Inversion' keeps winter in Portland, brings spring to Mt. Hood

These photos of Mt. Hood and Downtown Portland were taken from our weather cameras at the same time (3:38 p.m.) Tuesday. Mt. Hood was sunny and about ten degrees warmer than Portland due to a weather inversion.

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by KGW.com Staff

NWCN.com

Posted on January 15, 2013 at 4:54 PM

Updated Wednesday, Oct 30 at 4:46 AM

PORTLAND -- A weather inversion starting Tuesday should cause freezing temperatures into this weekend, but Mt. Hood was seeing springtime skiing conditions.

An inversion refers to warm air that builds, but leaves cold air at the surface in place. The weather pattern makes temperature forecasting uncertain and often leads to poor air quality and areas of persistent low clouds in calm wind areas, KGW Meteorologist Rod Hill said. 

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During an inversion, temps at higher elevations are higher then those at lower elevations. For example, although Portland stayed right around freezing Monday afternoon, Timberline Lodge warmed into the 40s. Temps at the Coast were also in the 40s.

City crews have been treating bridges, steep streets, and known trouble areas with de-icer.

Weather Blog: What's an inversion?

Patches of fog were also expected overnight in Portland.

A cold weather shelter in Oregon City was set up at Father's Heart Street Ministry opening at 7 p.m., doors close at 10 p.m. It is adults only and no pets are allowed. A light dinner and breakfast will be provided. Capacity is 30 to 40, the group said.

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