A storm bearing down on the Northwest could deposit 1 to 2 inches of snow in the Mid-Columbia beginning late Monday.
The National Weather Service issued a winter weather advisory for a fast-moving system, saying it should bring snow showers to the Tri-Cities.
Rain showers were forecast for Monday evening, turning to snow after 10 p.m., according to the weather service. A 70 percent chance of snow was forecast late Monday, dropping to 60 percent overnight and 30 percent by Tuesday morning.
Less than an inch of snow is expected to accumulate in the Tri-Cities, with heavier snow expected elsewhere in the Mid-Columbia.
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Patches of freezing fog are forecast from 4 to 10 a.m. Wednesday, with more snow likely Thursday in the Tri-Cities, possibly mixed with freezing rain Thursday night, according to the weather service.
The weather service cautions drivers that road conditions could be challenging. Check bit.ly/snowdelays for any school delays for closures.
Some Tri-City road departments raced Monday to apply deicer to major streets and intersections.
Monday, the Washington Department of Transportation closed the eastbound lanes of Interstate 90 at Snoqualmie Pass near Tinkham Road to clear away a number of crashes in the morning.
The pass reopened by noon but traction tires are advised and oversize vehicles are prohibited due to snow and slush on the roadway.
Similar conditions prevailed at midday on both White and Stevens passes.
An earlier storm caused some flight cancellations at Seattle-Tacoma International Airport on Monday morning but the cancellations did not significantly affect flights at the Tri-Cities Airport in Pasco.
Ron Foraker, Port of Pasco director of airports, said the Pasco airport is prepared to execute its snow plan to remain in business if necessary.
The state transportation department advises travelers to call 511 or visit wsdot.wa.gov/traffic for the latest road conditions.