KANSAS CITY: A vicious storm tore through the western outskirts of Kansas City on Tuesday, spawning one or more tornadoes that downed trees and power lines, damaged homes and injured at least 12 people in the latest barrage of severe weather that saw tornado warnings as far east as New York City.

Parts of Pennsylvania and New Jersey also were under tornado warnings hours after a swarm of tightly packed twisters swept through Indiana and Ohio overnight, smashing homes, blowing out windows and ending the school year early for some students because of damage to buildings. One person was killed and at least 130 were injured.

Those storms were among 55 twisters that forecasters said may have touched down Monday across eight states stretching eastward from Idaho and Colorado.

The past couple of weeks have seen unusually high tornado activity in the US, with no immediate end to the pattern in sight.

Tuesday offered no respite, as a large and dangerous tornado touched down on the western edge of Kansas City, Kansas, late in the day, the National Weather Service office reported. Twelve people were treated night for storm-related injuries at Lawrence Memorial Hospital on Tuesday night, spokeswoman Janice Early said. None of the injuries appeared to be life-threatening.

Kansas City International Airport temporarily suspended flights and forced travellers and employees to take shelter in parking garage tunnels for about an hour. A powerful twister also touched down in the nearby township of Pleasant Grove, Kansas, seriously damaging homes.

But the severe weather wasn’t limited to the Midwest. Tornadoes were confirmed in eastern Pennsylvania and the National Weather Service issued a tornado warning for parts of New York City and northern New Jersey.

The winds peeled away roofs — leaving homes looking like giant dollhouses — knocked houses off their foundations, toppled trees, brought down power lines and churned up so much debris that it was visible on radar. Highway crews had to use snowploughs to clear an Ohio interstate.

Some of the heaviest damage was reported just outside Dayton, Ohio.

“I just got down on all fours and covered my head with my hands,” said Francis Dutmers, who with his wife headed for the basement of their home in Vandalia, about 10 miles (16 kilometres) outside Dayton, when the storm hit with a “very loud roar” Monday night. The winds blew out windows around his house, filled rooms with debris and took down most of his trees.

In Celina, Ohio, 82-year-old Melvin Dale Hanna was killed when a parked car was blown into his house, Mayor Jeffrey Hazel said Tuesday.

“There’s areas that truly look like a war zone,” he said.

Of the injured, more than two dozen were admitted to hospitals.

Ohio Governor Mike DeWine declared a state of emergency in three hard-hit counties, allowing the state to suspend normal purchasing procedures and quickly provide supplies like water and generators.

The National Weather Service’s Storm Prediction Center showed that suspected tornadoes touched down in several states including Indiana, Colorado, Ohio, Iowa, Nebraska and Illinois.

Monday marked the record-tying 11th straight day with at least eight tornadoes in the US, said Patrick Marsh, a Storm Prediction Center meteorologist. The last such stretch was in 1980.

A tornado with winds up to 140 mph (225 kph) struck Monday near Trotwood, Ohio, a community of about 24,500 people 8 miles (12 kilometres) outside Dayton. Several apartment buildings were damaged or destroyed, including one complex where the entire roof was torn away, and at least three dozen people were treated for cuts, bumps and bruises.

“If I didn’t move quick enough, what could have happened?” said Erica Bohannon of Trotwood, who hid in a closet with her son and their dog. She emerged to find herself looking at the sky. The roof was gone.

Just before midnight, about 40 minutes after that tornado cut through, the National Weather Service tweeted that another one was crossing its path.

Only a few minor injuries were reported in Dayton. Fire Chief Jeffrey Payne called that “pretty miraculous,” attributing it to people heeding early warnings. Sirens went off ahead of the storm.

Some of the people treated at the area’s Kettering Health Network hospitals were hurt during storm clean-up itself, while others may have waited before seeking treatment from storm injuries, said spokeswoman Elizabeth Long.

A boil-water advisory was issued after the city’s pumping stations lost power. Dayton Power & Light said more than 50,000 customers remained without electricity and restoration efforts could take days.

A high school gym in Dayton was designated an emergency shelter until authorities realized it was unusable. Vandalia’s school system tweeted that it is ending the year two days early because of building damage. In nearby hard-hit Brookville, where the storm tore off the school’s roof, classes were cancelled.

In Indiana, a twister touched down Monday evening in Pendleton, about 35 miles (56 kilometres) from Indianapolis. At least 75 homes were damaged there and in nearby Huntsville, said Madison County Emergency Management spokesman Todd Harmeson. No serious injuries were reported.

Pendleton residents were urged to stay in their homes Tuesday morning because of downed power lines and other dangers.

“People are getting antsy. I know they want to get outdoors, and I know they want to see what’s going on in the neighbourhood,” Harmeson said. But he added: “We still have hazards out there.”

Outbreaks of 50 or more tornadoes are not uncommon, having happened 63 times in US history, with three instances of more than 100 twisters, Marsh said. But Monday’s swarm was unusual because it happened over a particularly wide geographic area and came amid an especially active stretch, he said.

As for why it’s happening, Marsh said high pressure over the Southeast and an unusually cold trough over the Rockies are forcing warm, moist air into the central US, triggering repeated severe thunderstorms and tornadoes. And neither system is showing signs of moving, he said.

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Scientists say climate change is responsible for more intense and more frequent extreme weather such as storms, droughts, floods and fires, but without extensive study they cannot directly link a single weather event to the changing climate.