Heavy snow could fall in the Southern Oregon mountains today, the National Weather Service cautioned in a winter storm warning that went into effect in the Cascades and Siskiyous at 10 a.m.

Heavy snow could fall in the Southern Oregon mountains today, the National Weather Service cautioned in a winter storm warning that went into effect in the Cascades and Siskiyous at 10 a.m.

The storm warning will be in effect until 10 a.m. Wednesday at elevations above 4,500 feet.

Wet snow with patchy freezing rain and sleet is expected to develop in late morning. Snow could become heavy by late afternoon and continue through the night, the warning said.

Eight to 16 inches of snow likely will fall in this storm, the warning predicted.

Highways 140 and 62 will be the most heavily hit, the warning said. Snow is also expected along Highway 66 and Interstate 5 at Siskiyou Summit, but snow isn't expected to stack up until after 4 p.m. and less accumulation is likely.

Shortly after 10 this morning, weather stations at the Crater Lake National Park boundary on Highway 62 and on Highway 230 at the Diamond Lake summit reported overcast skies, but no new snow yet.

The warning points out that drivers traveling through the mountains should be prepared for winter weather, with chains, food, water, blankets and a flashlight in the vehicle.

The cold front is expected to bring rain in the Rogue Valley this afternoon and through the night. Wet weather will linger through Friday.

— Anita Burke