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A snowstorm ripping through Douglas and Coos counties has caused multiple highway closures due to landslides, downed power lines and toppled trees. Interstate 5 is closed both ways between Glendale and Cottage Grove — nearly 100 miles of freeway. Oregon Highway 42 is closed between Coquille and Bandon due to a landslide. Heavy snow that caused trees and power lines to fall into the roadway has closed Oregon Highway 138 west between Sutherlin and Elkton, and east between mileposts 17 and 60, or just east of Glide to West Toketee. Fallen trees and power lines have also closed Oregon Highway 38 west of Elkton between mileposts 29 and 37, and Highway 101 is closed south of Bandon at Four Mile because of high water. More than 26,000 Pacific Power customers are without electricity, which has resulted in the closures of the Sutherlin and Port Orford/Langlois school districts and all Oregon state offices in Douglas County, except Reedsport. "It's quite a mess up there," said Oregon Department of Transportation spokesman Gary Leaming. But travel south just a bit into Josephine and Jackson counties, and heavy snow turns to rain, with temperatures warming significantly. Heavy winds on Mount Ashland have also closed the mountain to skiers for today. "Do not attempt to come to the mountain today," a Mt. Ashland Ski Area Facebook post said. "We are forecast for 65 mile an hour gusts." The stark and sudden difference in weather is due to an event called a "stationary front," which has positioned itself just north of the Umpqua Divide. "It's two air masses," said National Weather Service meteorologist Connie Clarstrom. "You've got one that's a cold air mass to the north, and then you have a moist, warm air mass to the south." For comparison's sake, Roseburg, which sits at 528 feet in elevation, is getting snow. Sexton Summit — about an hour away and 1,960 feet in elevation — is receiving rain. (Corrected online) "You get to about north of Canyonville, you start getting into the snow, and that's just because they have cold air. Cold air kind of got trapped in those valleys as well, in addition to being just north of the front," Clarstrom said. "And you have moisture streaming in from the southwest up and over this front, and that's what's causing this heavy snow up there and heavy rain down here." More than an inch of rain is estimated for the Medford and Ashland areas. Three to 4 feet of new snow is expected in and around Crater Lake and Diamond Lake, with more than a foot predicted for Lake of the Woods and 7 inches on the Siskiyou Summit. On Monday morning, the Rogue and Umpqua basins were, collectively, at 101 percent of average snowpack, according to the Natural Resources Conservation Service. The front is expected to move southeast Monday night, forecasters said. "We're not going to be in the clear, but it should be winding down as far as impacts go," Clarstrom said. "Especially over that Roseburg area." Then it's forecast to move back north, pushing into Jackson County Tuesday. At that time, snow levels are expected to drop to about 2,500 to 3,000 feet. "That forecast could change," Clarstrom said. "It's a very dynamic forecast period right now." Weather Service officials said area residents should continue to monitor the forecast to stay up to date on the best information. Reach reporter Ryan Pfeil at [email protected] or 541-776-4468.