That's because of "another atmospheric river event" that will bring copious rainfall to coastal and valley locations and 3 to 4 feet of snow to the Sierra, forecasters said. The storm will move into the Rockies by midweek: "One tricky travel area will be in and around the Denver area as snow spreads across the area on Wednesday,

As of Monday morning, multiple states and territories have been issued warnings about incoming storms that could potentially affect road and air travel. Rain and snow are expected to significantly impact the West Coast this week while a windswept storm carries over the Northeast.