Tornado warning ends for London and Middlesex County: Environment Canada – London

A tornado warning issued by Environment Canada for the London and Middlesex region has ended, but a tornado watch remains in effect.

The advisory, issued around 6:40 p.m. and dropped around 7:18 p.m. said a severe storm was tracking across southwestern Ontario and was “possibly producing a tornado.”

The warning was dropped by the agency for Strathroy, Komoka and western Middlesex County around 7 p.m.

It was dropped in London, Parkhill and eastern Middlesex and replaced by a severe thunderstorm warning about 20 minutes later.

Severe thunderstorm warnings were also in place for Grey-Bruce and Huron-Perth.

Tornado watches remained in place as of 7:20 p.m. for London-Middlesex, as well as Grey-Bruce, Huron-Perth and Sarnia-Lambton.

A tornado warning had been in effect for the Sarnia-Lambton region, but was dropped at 6:52 p.m. The warning was the second of the day in the county after one issued shortly before 5 p.m. was dropped around 5:20 p.m.

In addition to the tornado warning, a heat warning remained in place for the region early Wednesday evening.

It was nearly two months ago when a severe thunderstorm involving a derecho passed through southern Ontario, spawning two tornadoes in the city within minutes of each other.

No injuries were reported, but the storm caused significant damage and left thousands in the city in the dark for hours, some for days.

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What is a derecho and why did it cause so much damage?