The first significant snowfall of the season is expected in Colorado’s mountains Sunday with accumulation as much as 2 feet in some areas.

The National Weather Service issued winter storm warnings and advisories for much of the central and northern Colorado high country through midnight Monday.

The largest snow totals are predicted for elevations above 10,000 feet. The mountains north of Interstate 70 are estimated at 8 to 18 inches, with the mountains south of the highway expecting 5 to 10 inches.

Winter Storm Warning for the northern Mountains this afternoon through Monday. #cowx pic.twitter.com/2XV1ADzwKg — NWS Boulder (@NWSBoulder) October 1, 2017

Russell Danielson, a meteorologist at the National Weather Service in Boulder, said it started snowing Sunday morning in Jackson County at the Wyoming state line. The snow is expected to make travel hazardous, with the heaviest bands reducing visibility to near zero at times.

“We are kind of in a wet pattern,” Danielson said. “So there won’t be a whole lot of melting initially. Then, toward the middle to late next week, we could see some warmer and drier conditions.”

The snow will fall as low as 8,500 feet along the I-70 corridor and down to near 7,000 feet at the Wyoming state line. The most snow is expected in Jackson, Grand and Larimer counties, with 8-16 inches and local amounts up to 2 feet. In Summit County, the weather service is forecasting 4 to 10 inches of snow.

The weather radar also indicates an isolated chance of severe thunderstorms in the northeastern plains with hail up to 1-inch in diameter and possible wind gusts up to 60 mph.