Wild weather is impacting millions of people from coast-to-coast Tuesday. Source: CNN Two separate powerful storm systems are pounding both U.S. coasts tonight. Another atmospheric river hitting portions of the Northwest, including Portland and California - where the risk of flash flooding and snow is triggering more evacuation orders. While a powerful nor'easter is leaving hundreds of thousands of people without power in the Northeast and New England. More than 9,000 under evacuation as atmospheric rivers dump rain in California. The atmospheric river brought heavy rain, thunderstorms and strong winds, swelling rivers and creeks and flooding several major highways during the morning commute. In the San Francisco Bay Area, flooding blocked portions of several major highways, including Interstate 580 in Oakland, disrupting travel. And Peet's Coffee, a California-based chain, reported that after a heavy storm, an investigation is underway to determine the cause of a roof collapse that killed a worker at a distribution center leased by the company in Oakland. The storm marked the state's 10th atmospheric river of the winter, storms that have brought enormous amounts of rain and snow to the state and helped lessen the drought conditions that had dragged on for three years. State reservoirs that had dipped to strikingly low levels are now well above the average for this time of year, prompting state officials to release water from dams to assist with flood control and make room for even more rain. State transportation officials said Friday they removed so much snow from the roadways in February that it would be enough to fill the iconic Rose Bowl 100 times. Democratic Gov. Gavin Newsom has declared emergencies in 34 counties in recent weeks, and the Biden administration approved a presidential disaster declaration for some on Friday morning, a move that will bring more federal assistance into the state. Emergency officials have warned people to stay off the roads if they can and to carefully heed flash flood warnings. The atmospheric river, known as a “Pineapple Express” because it brought warm subtropical moisture across the Pacific from near Hawaii, was melting lower parts of the huge snowpack built in California's mountains. Snow levels in the Sierra Nevada, which provides about a third of the state’s water supply, are more than 180% of the April 1 average, when it is historically at its peak. More local videos here: https://bit.ly/2Pa0d1l Subscribe to NEXT: http://bit.ly/2eP1GwI Stay connected: 9NEWS Website: http://www.9news.com/ Facebook: / ilike9news Twitter: / 9news Instagram: / 9newsdenver Download the 9NEWS App: https://www.9news.com/appredirect/ Sign up for the 9NEWSLETTER: https://www.9news.com/email 9NEWS (KUSA) is located in Denver, Colorado.