In Portland, the city was still stinging from the fallout of a 2008 winter snowstorm that caused major traffic backups and public transportation delays.
This year, the city's Bureau of Transportation spread a de-icing solution over major roadways. The solution, calcium magnesium acetate, is considered less toxic and non-corrosive.
Portland does not use rock salt to prevent ice.
"We're not expecting huge accumulations of snow," said Bureau of Transportation spokeswoman Cheryl Kuck. "But we're ready for anything."
Snow on Tuesday canceled or delayed classes in many school districts in the region. Seattle Public Schools, the state's largest school district, closed schools two hours early on Tuesday.
AP Writer Rachel La Corte in Olympia and Donna Blankinship in Seattle contributed to this report.
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