Tornadoes touch down in Illinois as snow and rain continue in the Midwest and Northeast

Severe weather continued to batter swaths of the U.S. on Monday, leaving more than 300,000 utility homes and businesses without power from California to Michigan, while tornadoes the central part of the country dealt with and cleaned up from tornadoes.

At least on tornado had been confirmed as striking central Oklahoma late Sunday, the National Weather Service in Norman said.

Twelve patients with non-life-threatening injuries from the storm system were taken to the hospital in Norman, Police Chief Kevin Foster said. Several homes, businesses and schools were damaged, and residents were asked to be careful of downed power lines.

At least three tornadoes touched down in northern Illinois on Monday. Two made landfall in western Joliet and on the far north side of Naperville, according to the National Weather Service in Chicago.

A third tornado was reported Monday morning in Champaign, in central Illinois.

"Additional information on these tornadoes will be provided later today," the National Weather Service in Chicago tweeted.

The National Weather Service warned that dry and windy surface conditions were expected to add to an elevated risk of fire weather over parts of southeastern Colorado, the Oklahoma and Texas panhandles, eastern New Mexico and parts of Texas.

Extreme forecasts

Other parts of the country face snow, rain, strong winds and possible tornadoes this week.

"A deep mid-latitude cyclone will spread showers and thunderstorms across of the Midwest Ohio Valley and Mid-Atlantic today," the National Weather Service said Monday.

The weather service's storm prediction center has issued a slight risk warning of severe thunderstorms over parts of the Ohio Valley.

Meanwhile, a "swath of snow and ice are expected (to) spread across the Upper Midwest, Great Lakes and Northeast Monday while a secondary low-pressure system develops and the pair of surface waves drift slowly toward the East Coast," it said.

Snow is expected in parts of Connecticut, Massachusetts and Rhode Island into Tuesday with the "steadiest & heaviest snow occurring Monday night, the National Weather Service in Boston said. The highest accumulations of snow are expected to be across Connecticut into the Berkshires in Massachusetts.

New York City will be under a winter weather advisory Monday night and is forecast to receive 3 to 5 inches of snow and wind gusts up to 35 mph.

"Snow, sleet and rain expected. These conditions may cause significant travel difficulties," the National Weather Service said.

New York Gov. Kathy Hochul urged residents to keep an eye on the weather and stay safe.

"Another winter storm will impact most of the state starting tonight with snow or a mix of icy precipitation and high winds that will ultimately impact travel in the eastern part of the state on Tuesday morning," Hochul said. "State agencies are preparing emergency response assets and we are ready to assist local governments before, during and after the storm."

Many without power for days in Michigan

In Michigan, thousands of residents have been without power for days after last week's storm. As of Monday evening, almost 200,000 utility customers were still without power, according to PowerOutage.us.

DTE Energy and Consumers Energy, the state’s two main utilities, have said they are working to restore power to households across the state.

"Thanks to another day of all hands on deck work, our over 2000 line crew workers have restored power to a majority of customers that had their power knocked out by a half inch of ice," Consumers Energy tweeted Sunday.

On Monday, Michigan Attorney General Dana Nessel called on DTE Energy and Consumers Energy to "proactively issue credits for residents affected by the recent weather events," according to a statement.

"While this ice storm appears to have been one of the worst we have seen in many years, winter weather is an expected occurrence in Michigan. Residents deserve a grid they can rely on," Nessel said. "Despite asking for record increases time and time again, our utilities have failed to adequately invest in their own infrastructure or prepare for these storm events, choosing instead to leave ratepayers in the dark."

California snowfall

In California, which faced rare blizzard warnings last week, more than 46,000 utility customers were without power Monday morning, even as many across the state got some reprieve from the severe weather Sunday.

The state faced a fresh system of rain and high-elevation snow through Monday, however, with intense snowfall expected in some areas this week, the National Weather Service said Monday.

More than 62,000 utility customers remain without power in the state.

"Mountains from southern Oregon to central California will see the greatest impacts with heavy snow rates in excess of 2 inches per hour at times and additional snowfall of 4-7 feet along the Sierra Nevada," the weather service said. "Combined with high winds, blizzard conditions and dangerous to impossible travel are expected."

Those planning to travel by road at elevations above 1,000 feet through West Coast states were urged to "be prepared for rapidly changing conditions" and to have winter driving supplies.

"Heavy snow will make it as far east as the Colorado Rockies and as far south as northern Arizona where hazardous travel conditions are expected Tuesday and Wednesday," the weather service said.

This article was originally published on NBCNews.com