Interstate 90 has reopened after closing in both directions Thursday night from North Bend to Ellensburg because of collisions and spinouts in poor weather, according to the Washington State Department of Transportation.

“This is our first major snowstorm of the year,” said Summer Derrey, WSDOT spokesperson.

Unsafe driving has added to hazardous road conditions, said Derrey, who noted that many drivers are speeding or driving without chains on their tires. With snowfall expected overnight, WSDOT reminded drivers on Twitter that all vehicles heading east across Snoqualmie Pass, except those with four-wheel drive, are required to have chains.

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A winter weather advisory was in effect for the Cascades in Snohomish and King counties through 4 a.m. Friday, according to the National Weather Service. Between 3 and 8 inches of snow was expected in Snoqualmie and Stevens passes.