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Just as with Monday, a dense fog advisory is in effect for the Puget Sound region over the Tuesday morning commute. Visibility is about 1/4 mile throughout much of Western Washington. An advisory is in effect for King, Lewis, Snohomish, and Thurston counties until 11 a.m.

Gallery: Your Western Washington fog photos

KIRO 7 reports that WSDOT traffic cameras showed heavy fog along I-5 from the Canadian border down into Lewis County. Also, along I-90 between Seattle and Snoqualmie.

The good news: the foggy conditions won’t be as severe as Monday’s.

“We’ll have much less fog (Tuesday),” said UW professor of atmospheric science Cliff Mass to KIRO Radio. After Tuesday, Mass estimates that the fog will completely dissipate through the day.

The fog is expected to lift by 11 a.m. or noon, according to the National Weather Service.

“Some spots could certainly hold on to it a lot longer,” said Dustin Guy with the National Weather Service. “There are certain parts of the lowlands of Western Washington that are more fog-prone than others, like the South Sound, parts of Olympia.”

The bad news: Meteorologist Nick Allard says fog will begin to lift only slightly this afternoon, but a weak system offshore will start to move in. So unlike Monday, sunlight won’t be breaking through as much on Tuesday. In fact, rain is likely Tuesday evening into Wednesday morning.

“As a front approaches, the fog will turn to low stratus by late morning in most spots and will even break up with limited sunshine. However, high clouds will be overspreading the region, so we might just end up being cloudy in most spots through the day,” Allard said.

On Wednesday, we’ll see a shower or two early, then a partly sunny and dry afternoon. Thursday looks rainy and breezy and then on Friday we’ll just have a shower or two. Saturday look for increasing showers for the evening hours and then rain on Sunday.

Monday fog

The dense fog resulted in poor driving conditions for the entire Monday morning commute.

The Seattle-Bremerton ferry route was delayed about 20-30 minutes due to the fog. Other ferries were also affected by the fog. Sea-Tac Airport suspended take offs and landings at 8:50 a.m., citing a visual range of 500 feet. They resumed about an hour later.

Along with the thick fog came poorer air quality, especially for sensitive groups. Air quality was ranked as “moderate” throughout much of Western Washington Monday morning.

MyNorthwest and KIRO 7 contributed to this article.