A “treacherous” days-long blizzard which could bring up to 10 feet of snow and extreme winds is set to hammer California’s Sierra Nevada this weekend, with officials warning of deadly travel conditions across the state. The snowstorm is set to close major roads throughout the region’s mountain passes and may cut off communities for extended periods, meteorologists said. It’s set to be one of the largest whiteouts the Sierra Nevada has ever experienced – outranking February 2023’s major storm. Yosemite National Park officials ordered all visitors to leave yesterday evening, with the area set to…