Weather with Cliff Mass
2:12 pm
Sun October 27, 2013

Mass: Blame the Boa Constrictor-Like High Pressure for Fogtober

Tim Durkan

Why did we have such a long stretch of fog? Blame the inversion, says KPLU weather expert Cliff Mass.

Foggy days in the fall aren’t uncommon in the Northwest, but the recent long stretch—the so-called “Fogtober” and “Fogmageddon” that Mass said will finally leave us Sunday—is quite rare.

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Weather with Cliff Mass
9:38 am
Fri October 25, 2013

Fogmageddon Ending; Sunshine, then Return to Normal

Tim Durkan

Fogmageddon will end on Sunday, “pretty much guaranteed,” says KPLU weather expert Cliff Mass.  

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Weather with Cliff Mass
9:58 am
Fri October 18, 2013

No Rain in the Forecast This Week, but More Fog, Afternoon Sun

Keith Seinfeld

The very dense fog hanging around the region this morning bodes well for a long sunny day ahead, and the week will continue with that pattern, says KPLU weather expert Cliff Mass.

“As I mentioned before, that’s a tremendously good sign,” said Mass, who teaches Atmospheric Sciences at the University of Washington. He says the densest fog usually means the sunniest afternoons.

“The clouds, the cold air, that low foggy layer is actually very shallow today and I expect it to burn out much quicker than it has in the past,” he said, predicting that it should be completely sunny outside by 11 this morning, with temperatures going up to around 60.

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Weather with Cliff Mass
10:13 am
Fri October 11, 2013

Soggy Weekend Likely, but Glorious Fall Sun in Week Ahead

zenobia_joy Flickr via compfight


The clouds and light rain that have been darkening skies in southern King County should give way to dry weather and partly cloudy skies later today. And that’s just the first glimmer of nice fall weather in a week that promises to bring lots of mid-October sunshine.

That’s according to KPLU weather expert Cliff Mass, a professor of atmospheric sciences at the University of Washington.

“By this afternoon it’ll be partly cloudy,” Mass said, and “completely dry in all of western Washington.”

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Weather with Cliff Mass
9:17 am
Fri January 18, 2013

How to avoid that stagnant air, which is here 'til Tuesday

Chris Blakeley Compfight

In some places, such as eastern Washington farms, they actually use giant fans to disrupt the inversion that causes stagnant air (which is what we've been experiencing for a week, and can leave frost on fruit trees).

But, KPLU weather expert and UW professor Cliff Mass says those fans won't work in western Washington, because the natural forces creating the inversion are too strong. Instead, he suggests taking a hike.

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