If temperatures drop below freezing, she said, it could lead to “major ice build-up,” creating hazardous driving conditions. Melting snow and ice in some areas are also leading to high water and standing water hazards, she said. If temperatures fall, these could also re-freeze.

Much of the Portland metro and Willamette Valley saw some snow Thursday. Here's what to know if you're thinking of shoveling snow and ice.

Freezing rain and ice are likely to continue impacting roads until a widespread warmup midday Friday across the Willamette Valley. Latest updates.