An active Jet Stream will bring a stream of energy and humidity into the West, with areas of heavy snow developing in the Sierra Nevada Mountains. Winter Weather Advisories have been issued into Saturday for up to a foot of snow above 6,000 feet. The highest peaks may see nearly 2 feet of snow. Heavy rain and strong wind gusts are likely for northern California and southern Oregon. More than 3" of rain may fall along with gusts above 50 mph. Flood and wind alerts have been issued through the weekend. Snowfall will continue in the Sierra Nevada Range through Saturday midday. The heaviest snow is expected Friday afternoon into Saturday morning. The wind will pick up, with blowing and drifting snow likely. Travel will become difficult. Waves of heavy rain will move into coastal areas throughout the weekend, bringing a threat for flooding and mudslides. For WeatherNation: Meteorologist Mace Michaels