Another line of thunderstorms late Wednesday afternoon and evening could cause more damage, less than a week after the last bout spawned tornadoes and microbursts in Southwestern Ontario.
The warm, steamy temperatures blanketing the region are feeding the latest batch of storms that could affect residents living between Windsor and northeast of London.
Environment Canada issued severe thunderstorm watches for London and Middlesex County, Elgin and Oxford counties, Huron County, Sarnia and Lambton County, Windsor and Essex County, and Chatham-Kent.
Warnings were later put in place for several areas.
By 10 p.m., most thunderstorm watches and warnings were lifted.
A tornado warning was issued for Windsor-Essex after 4 p.m. That warning has since ended.
Significant damage has been reported in several municipalities in and around Essex County however, it has not yet been confirmed if those damages occurred from a tornado touchdown.
Environment Canada has also issued a Marine Tornado Warning for the lower Great Lakes. Caution was advised in the Lake Erie area. Lake Huron was not included in the warning.
"The main threats would be strong wind gusts up to 110 km/h and significant rainfall up to 75 mm," said Warning Preparedness Climatologist Monica Zasuani. "There is also a threat for hail up to 3 cm in diameter."
The greatest threat, she said, will be what climatologists call "straight line" wind.
As the storm front approaches, it moves in a line across the landscape.
"It's almost like a brush sweeping through that area," she explained.
Winds that strong can cause structural damage to buildings and topple trees.
Zasuani couldn't rule out the possibility of a tornado.
Storms last Thursday night spawned an EF-0 tornado with top winds of 115 km/h near Petrolia and, near South Buxton, an EF-1 tornado where winds reached 175 km/h.
It also caused microbursts in Chatham-Kent and Lambton County.
