The same weather system that spawned two tornadoes, killing one child in Nebraska yesterday, will light up the skies over parts of southern Ontario this afternoon, before it is set to wreak havoc with strong winds and hail the size of ping pong balls.
"Not as strong as what we were looking at yesterday, but there is the risk for severe thunderstorms, hail, strong winds, intense lightning, heavy rain — cannot rule out an isolated tornado," said CBC meteorologist Jay Scotland.
Southern and northeastern Ontario are at risk of severe thunderstorms in the afternoon and evening, including the Greater Toronto Area, said Scotland.
Hamilton, Caledon and Shelburne were reporting lots of lightning late Tuesday morning, with the city of Hamilton and other regions already under a severe thunderstorm warning.
At mid-morning, lightning could be seen around the Bruce Peninsula, said Scotland.
"Round No. 1 on what could be a very active, very unsettled, possibly severe weather day," he said. "Very muggy conditions ahead of a storm system? Bad combination."
Environment Canada issued several weather warnings across southern Ontario.
Severe thunderstorm warnings are in place for:
- York-Durham.
- Halton-Peel.
- Grey-Bruce.
- Dufferin-Innisfil.
- City of Hamilton.
The severe thunderstorm expected to pass through these areas is capable of creating strong wind gusts, heavy rain, and hail ranging in size from a dime to a ping pong ball.
Environment Canada issued a special weather statement for parts of southern Ontario that asks people to take necessary safety precautions if adverse weather conditions arrive. That includes taking cover if threatening weather approaches and going inside upon hearing thunder.
"In Canada, lightning kills up to 10 people every year," the government agency reminded Canadians.
The storms will intensify over the next two hours.
By 11 a.m. ET, all of southern Ontario was at least under a severe thunderstorm watch.
Environment Canada also issued a weather warning for Windsor-Essex-Chatham-Kent on Tuesday morning over high temperatures. At 10 a.m. ET, the temperature in Windsor hovered around 25 C, but felt like 34 C.
'The main threats will be torrential downpours, damaging winds and large hail.'- Environment Canada special weather statement
Environment Canada expects afternoon temperatures in southern Ontario to peak at the upper 20s Celsius, to lower 30s.
Meanwhile, humidex values may reach the mid- to upper 30s.
Humidex is short for humidity index. If the humidex is forecast at 40, it means that the temperature might be 35 C but, with the humidity, the discomfort feels like it would at a dry temperature of 40 C. This means that on Tuesday, it may feel like the temperature is in the mid- to upper 30s.
As the warm and humid air mass moves closer to Ontario on Tuesday afternoon, showers and thunderstorms will start across the region.
Later in the afternoon and into the evening, some areas may experience severe thunderstorms.
"The main threats will be torrential downpours, damaging winds and large hail," read the special weather statement.
The two tornadoes that tore through northeast Nebraska, killing a five-year-old, touched down within 1.5 kilometres of each other and destroyed more than half of a small town of roughly 350.
Monday's U.S. weather resulted in 30 preliminary tornado reports, as well as large hail and strong, straight-line wind reports.
"Wind does not have to spin to cause damage," said Scotland. "I think straight-line winds will be the bigger risk for southern and northeastern Ontario today, in terms of damaging wind, more so than tornadoes."
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