Much of northwest Oregon and Southwest Washington saw snow overnight, at elevations as low as 500 feet.

Even below that, some parts of the Portland metro area saw a slushy mix on the roadway. Dozens of school districts throughout the region started on two-hour delays or put their buses on snow routes. Schools were closed in several districts in Columbia County in Oregon and Cowlitz County in Washington.

View a full list of area school closures here.

Central Oregon woke up to several inches of low-elevation snow, and Bend-La Pine schools were closed for the day.

A blizzard warning is in effect for continued high winds and heavy snow in the Cascades. Elevations above 1,000 feet, including the mountain passes, are still under a winter storm warning. But outside of that, the National Weather Service says temperatures rose above freezing for much of the region early Wednesday morning, and any remaining snow should be gone by the afternoon.

Another winter weather system is moving in later this week that could bring snow to lower elevations including the Willamette Valley by Saturday morning.

Spokesperson Don Hamilton said Oregon Department of Transportation crews were on hand to clear roadways and help with snow impacts Wednesday morning, and will be on standby as unpredictable winter weather continues.

“We’ve got the plows and the salt and the gear and the sand, ready to face whatever’s coming,” he said. “This is a lot of bad weather coming, really all through this coming week.”

But he also asked drivers to be especially cautious.

“We want to make sure everybody is ready and is looking out for each other on the streets out there,” Hamilton said. “Watching the roads out there and making sure they know where they’re going, and to make sure that they are prepared for bad weather.”

Here’s how to prepare as extreme weather approaches the Willamette Valley