A weather system will bring 3 to 8 inches of snow to mountain passes across Western Montana and North-Central Idaho through Sunday afternoon. Travelers should prepare for slower travel and occasional winter driving conditions, particularly at Lookout Pass (I-90), Lolo Pass (Hwy 12), and Marias Pass (Hwy 2). Check current road conditions at mdt511.com or 511.idaho.gov before heading out. Additionally, a light wintry mix will open up the potential for pockets of black ice in valleys, particularly in northwest Montana.