Extreme weather conditions from coast to coast put more than half the U.S. in the path of rough conditions. Storms across the nation's eastern half forced airlines to cancel more than 3,000 flights nationwide Monday. Many schools closed early in the mid-Atlantic states, where high winds and tornadoes were in the forecast. Blizzards buried parts of Michigan, Wisconsin and Minnesota while torrential rains flooded homes and washed out roads in Hawaii. California is dealing with unusually high temperatures for this time of year. Areas near San Francisco could see temperatures in the high 80s.

Storms sweeping across the eastern half of the country are disrupting air travel across the United States. FlightAware reported more than 3,500 flights canceled Monday and about 6,300 others delayed. The storms already dumped heavy snow across parts of the Midwest and were moving toward the East Coast with strong winds and the threat of tornadoes. The travel disruptions come during a busy period for airports, with spring break vacations and fans traveling for March Madness games. Meanwhile, a partial government shutdown affecting the Transportation Security Administration has stretched staffing at some airport security checkpoints, leading to longer lines in some places.

A massive snowstorm is pummeling the northeast United States, forcing millions of people to stay home amid strong wind and blizzard warnings, transportation shutdowns, and school and business closures. The storm hit the metropolitan northeast as accumulations from an earlier snowfall had just melted away, except for gray mountainous piles in parking lots and along the side of roads. Officials have declared emergencies from Delaware to Massachusetts, and hundreds of thousands of people are grappling with power failure from downed electrical lines. Even as digging out began, the National Weather Service warned Monday that perilous conditions could persist.