After a wet and wild start to the month, Oregon’s weather has dried out in a big way and that’s expected to stay the case for the foreseeable future.

The National Weather Service (NWS) issued a warning for some beach counties in Oregon about so-called sneaker waves that could kill people. Sneaker waves could be lethal by knocking over unsuspecting people and pulling them into cold waters or carrying heavy driftwood logs that can pin people down.

Clear skies and offshore flow have combined to bring significant overnight cooling to the metro area early Tuesday allowing low temps to dip to about 5-10 degrees below normal. As of 5 a.m., many metro areas showed temperatures at about 25 degrees other than in the city cores.

The National Weather Service is warning of air stagnation and dense fog in the Willamette Valley. Advisories have been issued for both events. Dense fog is expected to persist until 1 p.m. Thursday in the central Willamette Valley,

KGW meteorologist Joe Raineri reported Sunday that Western Oregon will see overnight lows in the 20s, with the Columbia Gorge facing wind chills in the teens.

A surface inversion is preventing the normal mixing of air, meaning pollutants will remain trapped at lower altitudes.

The Oregon Coast is bracing for a final round of king tides this season, which can be especially dangerous when they coincide with sneaker waves, which can surprise beachgoers by running up on the beach significantly farther than other waves.

The “cold weather advisory” is a new type of advisory for the National Weather Service, replacing the “wind chill advisory,” said Daniel Hartsock, a meteorologist with the National Weather Service in Portland.

Low morning temps have led to frost formation throughout western Oregon. Be careful of slick spots, especially in shaded areas.

Portland’s air quality is currently comparable to Los Angeles, despite the ongoing wildfires in Southern California.

Read on to see the counties in Oregon with the most auto repair shops. All counties are ranked by the number of establishments per 100,000 people. Read the national version here.