Environment Canada has confirmed that two tornadoes touched down in southern Ontario Tuesday afternoon.

About an hour before an EF-1 twister tore through New Tecumseth, Ont., the national weather agency said another one struck near Amaranth, Ont. at around 3:30 p.m.

"There was a seven-kilometre track about 150 metres wide of damage, including a house with roof damage, a house with walls blown out and a 16,000-pound RV moved eight feet," Environment Canada meteorologist Peter Kimbell told CP24 on Wednesday. "(Investigators) have determined (that) an EF-1 tornado touched down there as well."

Kimbelll said the newly confirmed tornado was part of the same line of thunderstorms that was associated with the New Tecumseth twister.

That tornado struck the small Ontario community at around 4:30 p.m. Trees were snapped in half and hydro polls were pulled onto the streets of New Tecumseth, leaving a trail of damage that looked "like a scene in the 'Wizard of Oz,'" one resident told CTV Toronto.

Resident Teresa Greco said she saw the storm coming from across a farmer's field, and saw pieces of metal roofing caught in the funnel cloud flying through the air.

Greco said she saw one of the tornadoes while driving, and managed to outrun it by reversing her vehicle.

The New Tecumseth tornado ripped the roof off one home, causing part of the second-storey floor to cave in. At another house, Ontario Provincial Police said the back wall of a garage was torn off.

There are no reports of people being injured in the area 90 kilometres northwest of Toronto, but a horse was killed and others had to be treated by a vet.

An EF-1 tornado means winds reached speeds of between 135 and 175 km/h. The EF scale runs from 0 to 5.

The two tornadoes come just a week after an EF-2 tornado damaged 101 homes in the nearby town of Angus, Ont., about 20 kilometres northeast of New Tecumseth.