National Weather Service (NWS) meteorologists are warning motorists to slow down and use caution in four states as snow, high winds and reduced visibility are expected to create hazardous travel conditions in mountainous areas through Monday evening.

Emergency winter weather advisories have been issued for parts of California, Nevada, Washington and Oregon. Areas affected include the Greater Lake Tahoe region of California and Nevada, the West Slope Northern Sierra Nevada and parts of the Cascades in Washington and Oregon, where snow and hazardous conditions are expected in these mountainous areas.

Authorities are urging motorists to exercise caution, especially on major passes, where snow accumulation can range from a few inches to more than a foot. The warnings highlight the potential for slippery roads, poor visibility and travel delays.

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In the Greater Lake Tahoe area, a Winter Weather Advisory has been issued for elevations above 7,000 feet from Monday afternoon until 10:00 PM PST. Snow accumulations of 5 to 15 centimeters are expected, with wind gusts up to 70 km/h. Drivers should anticipate slippery road conditions at the area’s passes, including Donner, Echo and Carson, with visibility reduced to less than half a mile at times.

In Washington’s North Cascades, including Washington Pass, a winter weather advisory will be in effect for elevations above 4,000 feet from 6 p.m. Sunday through 1 p.m. Tuesday.

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Snow accumulations of between 10 and 16 centimeters are expected, with wind gusts up to 55 km per hour. Travelers on SR 20 and Washington Pass should prepare for difficult travel conditions. Likewise, Washington’s Okanogan County area will see up to 14 inches of snow above 4,000 feet, with the advisory running from 6 p.m. Sunday to 1 p.m. Tuesday.

In southern Oregon, the Siskiyou Mountains and Southern Oregon Cascades are also preparing for heavy snow, with totals in areas above 5,000 feet expected to range between 8 and 16 inches. The advisory, which runs from 4 a.m. Monday to 10 a.m. Tuesday, warns of difficult travel conditions, especially during the Monday morning and evening commute.

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Meanwhile, nearly 40,000 customers were without power in Colorado early Saturday after a winter storm ripped through the state.

Denver County was the hardest hit, with about 25,000 customers affected as of Saturday, according to PowerOutage.us, an online service that tracks disruptions across the country.

Counties surrounding Denver, such as Adams, Jefferson and Arapahoe, recorded 4,485, 4,400 and 3,630 outages, respectively.

Storm warnings have also been issued this week for several other states, including Colorado, New Mexico, Oklahoma and Texas. Up to 2 feet of snow was expected in Colorado’s mountain areas, while cities like Matheson, Agate, Hugo and Limon could receive up to 2 feet of snow.