A relatively upper-level concrete trough is now located in the latitude of 36N and longitude of 158W. Multiple weak upper-level lows are snaking through the eastern Pacific, close to the southern California coastline.
Haze continues to be a concern in the northern valleys, owing to the prolonged duration of sub-ridgeline inversions that have occurred in these places.
This morning, a few sites, mainly around the Salt Lake City Airport, are beginning to suffer locally severe fog. These locations include I-80, I-215, and the Legacy Parkway, located near the Great Salt Lake, among others.
Travelers should be prepared for locally intense fog in this region, and they should slow down and increase their distances while traveling through it.
Across the northern Utah valleys, hazy weather will persist on Saturday, continuing a recent pattern.
Modeling soundings continue to suggest that the top of the inversion may continue its downward descent toward the valley floor. This may cause visibility to be reduced even more in haze and/or fog on Saturday and into early Sunday.
High pressure continues to prevail over the area, resulting in hazy weather in the northern valleys of the region.
It is projected that a cold front will sweep through northern Utah on Sunday, which will help to ventilate the valleys of the north and minimize smog.
On the horizon for next week is a more progressive trend, with one storm affecting mostly northern Utah on Monday and Tuesday, followed by another possibly significant storm affecting much of the state later on Wednesday and into Friday.
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