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SEATTLE - After snow showers blanketed most of Western Washington on Sunday, the concern shifts to road conditions. Temperatures are expected to drop below freezing overnight.

Commuters heading to work before dawn should remember that the coldest time of day is the hour before sunrise. Check the Futurecast temperatures

The Washington State Department of Transportation has all available trucks and equipment on state highways and interstates overnight in the greater Seattle / Bellevue area. When it freezes, the primary tool is anti-icer. But when snow showers come through, crews will use plows, anti-icer, de-icer, sand and salt to treat the roads.

Washington State Department of Transportation officials are asking people to be prepared when venturing out.

We need drivers to check the forecast, check the roads, and check their experience level as they make their decisions, said Dave McCormick, regional maintenance manager for the Washington State Department of Transportation.

If you don't feel confident driving in these conditions, then we would advise you make other plans to get to your destination or stay home, he said.

Washington State Department of Transportation maintenance crews were out in full force on Sunday afternoon and evening, sanding roads and helping Washington State Patrol troopers handle multiple collision and lane closures.

Our biggest problem is people who drive too fast for conditions. They lose control, leave the roadway or strike other vehicles, said Trooper Julie Startup.

A winter weather advisory is in effect until 10 p.m. tonight for the Seattle-Tacoma-Bremerton area. Overnight low temperatures will fall to the mid 20s to low 30s.

Heavy snow began falling on downtown Seattle just after noon and continued for more than an hour, making travel difficult. Traffic slowed to a crawl on Interstate 5 and several buses got stuck on slick ramps.

King County Metro has switched to snow routes across King County. Check your route

Flurries could last through Monday, leaving sporadic accumulations as low as sea level. Check current conditions

A warm front approaches Wednesday, bringing warmer air and rising snow levels but it may start as snow before turning over to rain in most places.

We should just see rain by Wednesday night, with rain at times on Thursday and Friday. Highs at that point will be in the low to mid 40s.

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