The relentless series of storms caused deaths or damage from the Plains to Canada to New England. Hundreds of thousands of people lost power and air conditioning during days of sweltering heat.

The tornado that struck Tuesday left a wide swath of obliterated homes and crumpled cars. Officials did not immediately give details of other deaths or injuries.

Forecasters warned a wave of dangerous storms in the U.S. could march through parts of the South early Thursday, after deadly storms a day earlier spawned damaging tornadoes and massive hail.

A storm packing heavy rain was sweeping through the Northeast early Wednesday, while winter weather brought tornadoes in the Midwest and South, flood threats in Florida and blizzards in the Northwest.

Police and firefighters in Clarksville were responding to multiple reports of damage in the northern part of the city, which is located north of Nashville near the Kentucky state line.

A tornado touched down Wednesday evening near Chicago's O'Hare International Airport, prompting passengers to take shelter and disrupting hundreds of flights. There were no reports of injuries.

A large tornado hit southeastern Missouri before dawn, causing widespread destruction as a broad swath of the Midwest and South braced for further storms that could spawn additional twisters and hail.

The powerful storm system spread destruction in several states. In Illinois, one person died and 28 were hurt after a theater roof caved in during a concert.

A monster storm system spawned deadly weather including tornadoes that shredded homes and shopping centers in Arkansas and collapsed a theater roof during a heavy metal concert in Illinois.

America will probably get more killer tornado- and hail-spawning supercells as the world warms, according to a new study that also warns the lethal storms will edge eastward to strike more frequently.

Western Mississippi is turning to recovery after being hit by a long-track tornado on Friday. Here's what made it so destructive — and why the impact of climate change on tornadoes is still unclear.

Extensive damage to buildings, homes and infrastructure can be seen across the area as the tornado moved from the southwest to the northeast directly through the town, the technology firm Maxar said.

Devastating accounts of utter destruction, incredible survival and tragic deaths followed Friday's twister that killed at least 25 in Mississippi and one in Alabama as it surged nearly 170 miles across the Deep South.

The destructive tornado killed at least 26 people, leveled buildings and left thousands of customers without power.

The strongest tornado to impact the Los Angeles metro area in 40 years touched down at 11:14 a.m. for two to three minutes, according to the National Weather Service.