Ada County Highway District crews were out in force overnight and through Thursday morning, attempting to stay in front of the first taste of winter. Ada County roadways were treated with magnesium chloride beginning at 2 a.m., in an effort to prevent ice from accumulating. ACHD's winter maintenance crew includes 125 people who work alternating shifts, operating sanders, salt- and de-icing trucks and 23 snow plows across 2,200 miles of local roads.
A single-car rollover blocked the Eagle Road on-ramp to I-84 this morning, adding to the already-tangled rush hour. One person was taken to the hospital from the accident.
Idaho State Police reported nearly two dozen accidents across the Treasure Valley by late morning.
A winter storm warning has been issued for the Boise Mountains for Thursday afternoon through early Friday morning. Up to 15 inches of snow is expected for the region, which winds gusting up to 15 miles per hour, creating very treacherous driving in mountain communities.
Meanwhile, a winter weather advisory is in effect for much of the rest of southwest Idaho, with two inches of new snow expected in the valleys, and winds gusting to 15 mph.
Thursday night lows in Boise should hover around 30 degrees and Friday's wintry mix should accompany a high of 39 degrees. Clear, cold weather is expected for the weekend.