The Winter Storm Watch warns of hazardous travel conditions in the Sierra Nevada, especially above 6,000 feet. Blizzard conditions may occur above 7,000 feet on Friday, with reduced visibility and dangerous road conditions. Gusty winds could lead to downed tree branches and localized power outages. Lower elevations in Northern California may experience heavy rain, slick roads, and longer commutes. Travelers are advised to prepare for delays and carry chains if crossing mountain passes during the storm.