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What's a derecho and why is it so destructive? The science behind this powerful storm – CBC News

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When Canadian tornado expert David Sills studied the forecast on Saturday morning, he never expected the line of storms headed for Windsor, Ont., would soon strengthen into Canada’s first derecho in decades, wreaking havoc across southern Ontario and Quebec. 

Sills, who is the executive director of the Northern Tornadoes Project at Western University, was outside doing yardwork at his London, Ont., home when he heard a rumble in the distance; he couldn’t believe the line of storms was still so active. 

“I’m thinking, ‘What? Why is this thing still going?'”

He went back inside to study the forecast, and that’s when the storm arrived at his doorstep.

“All of a sudden it hits and it’s just like a hurricane,” Sills said. “It’s just getting stronger and stronger … I watched as a tree came down on my neighbour’s roof across the street.”

That’s when he knew it wasn’t a normal thunderstorm. 

Powerful winds lift up dirt before the storm arrived in Saint-Bernard-de-Michaudville, Que. (Daniel Thomas/Radio-Canada)

An ominous wall of wind and rain

A derecho, pronounced deh-RAY-cho, is a long-lived, fast-moving thunderstorm that causes widespread wind damage. This particular storm system was fed by a heat dome over the eastern United States. 

According to Sills, the system formed south of Chicago on Saturday morning, then crossed the border into the Windsor area, where it started to cause damage. 

By the time it arrived in Kitchener, Sills said the thunderstorm was producing gusts of up to 132 km/h. 

Unlike the rotating winds in a hurricane or a tornado, a derecho’s winds are straight. That doesn’t mean it’s any less damaging; its winds can topple trees and lift up roofs. Another feature of a derecho is that unlike the slow building of a supercell thunderstorm, the business end of a derecho is at the front. 

That’s why when you witness a derecho, Sills said, it often looks like an ominous wall of wind and rain. 

“When it hits, usually the worst of it is within a couple minutes of it hitting,” he said. 

Part of a utility pole lies on a driveway, along with the roof of a hardware store that was lifted off by extreme winds during Saturday’s storm, in the community of Hammond in Clarence-Rockland, Ont. (Justin Tang/The Canadian Press)

Making that destructive wall of wind even worse, is that it can sometimes produce tornadoes as well.

“Really, it’s just a spectrum of wind that affects a long area,” Sills said. 

So far, field crews with the Northern Tornadoes Project have identified at least one EF2 tornado, which hit Uxbridge, Ont., with wind speeds of up to 195 km/h.

The team is investigating at least four other possible tornadoes in southern Ottawa, London, Ont., and Rawdon, Que.

Sills said he expects there could be even more.

Even if that’s the case, “the overwhelming majority of the damage was caused by straight line derecho winds,” said Environment Canada warning preparedness meteorologist Peter Kimbell.

He said both Ottawa and Toronto airports reported 120 km/h winds.

A rare event: Canada’s 1st derecho since 1999

The last string of derechos that hit Canada were in the 1990s, including one in 1999. According to the U.S. National Oceanic and Atmospheric Administration, that storm cut a path through Thunder Bay and sparsely populated areas of northern Ontario before crossing into Quebec, where it killed one person, toppled trees, damaged buildings and overturned boats in the Montreal area.

“It is the widespread nature of a derecho that can really cause havoc in a city,” Sills said. 

What made Saturday’s storm especially unlucky was that several urban centres were directly in its path.

“This was an unusual event because it affected the most populated part of Canada,” Kimbell said.

The system formed south of Chicago on Saturday morning, and then it moved through Ontario, according to tornado expert David Sills. (Environment and Climate Change Canada/CBC News)

Environment and Climate Change Canada issued a broadcast alert for a severe thunderstorm, setting off alarms on people’s cellphones in Ontario and Quebec. It was the first time a new feature was tested, allowing the forecaster to trigger an alert for extreme thunderstorms with high winds.

“That’s the first time they’ve done that, and it probably saved lives,” Sills said.

Still, the storm left a path of destruction in its wake, killing 10 people and leaving roughly 900,000 homes and businesses without power in Ontario and Quebec at its peak. It continued all the way to Maine, where there were also reports of damages.

Climate change could bring more derechos

Pinning down whether or not the rare event could be linked to climate change is difficult. Because derechos are so infrequent in Canada, Sills said it’s impossible to say whether they’re increasing or not. 

But, he said, the ingredients necessary to form a derecho “may come together more often” as a result of the effects of climate change.

A derecho happens when there’s a lot of heat and moisture available and they are often tied to heat domes. Sills said climate projections point to a warmer atmosphere that will creep northward, which means this is the kind of storm Canadians can expect to see more of in the future. 

Aerial images shot from a drone show the aftermath of Saturday’s storm in Uxbridge, Ont. (Sue Reid/CBC News)

There is always something to learn from extreme weather events, Sills said, and a key takeaway for him after this storm is that computer modelling needs to catch up.

“There wasn’t much in the way of any indication in the models of this big derecho coming through,” he said.

“The computer models we rely on to give us a heads up for these types of events, they’ve got a long way to go.” 

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Bad traffic, changed plans: Toronto braces for uncertainty of its Taylor Swift Era

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TORONTO – Will Taylor Swift bring chaos or do we all need to calm down?

It’s a question many Torontonians are asking this week as the city braces for the arrival of Swifties, the massive fan base of one of the world’s biggest pop stars.

Hundreds of thousands are expected to descend on the downtown core for the singer’s six concerts which kick off Thursday at the Rogers Centre and run until Nov. 23.

And while their arrival will be a boon to tourism dollars — the city estimates more than $282 million in economic impact — some worry it could worsen Toronto’s gridlock by clogging streets that already come to a standstill during rush hour.

Swift’s shows are set to collide with sports events at the nearby Scotiabank Arena, including a Raptors game on Friday and a Leafs game on Saturday.

Some residents and local businesses have already adjusted their plans to avoid the area and its planned road closures.

Aahil Dayani says he and some friends intended to throw a birthday bash for one of their pals until they realized it would overlap with the concerts.

“Something as simple as getting together and having dinner is now thrown out the window,” he said.

Dayani says the group rescheduled the gathering for after Swift leaves town. In the meantime, he plans to hunker down at his Toronto residence.

“Her coming into town has kind of changed up my social life,” he added.

“We’re pretty much just not doing anything.”

Max Sinclair, chief executive and founder of A.I. technology firm Ecomtent, suggested his employees avoid the company’s downtown offices on concert days, saying he doesn’t see the point in forcing people to endure potential traffic jams.

“It’s going to be less productive for us, and it’s going to be just a pain for everyone, so it’s easier to avoid it,” Sinclair said.

“We’re a hybrid company, so we can be flexible. It just makes sense.”

Swift’s concerts are the latest pop culture moment to draw attention to Toronto’s notoriously disastrous daily commute.

In June, One Direction singer Niall Horan uploaded a social media video of himself walking through traffic to reach the venue for his concert.

“Traffic’s too bad in Toronto, so we’re walking to the venue,” he wrote in the post.

Toronto Transit Commission spokesperson Stuart Green says the public agency has been working for more than a year on plans to ease the pressure of so many Swifties in one confined area.

“We are preparing for something that would be akin to maybe the Beatles coming in the ‘60s,” he said.

Dozens of buses and streetcars have been added to transit routes around the stadium, and the TTC has consulted the city on potential emergency scenarios.

Green will be part of a command centre operated by the City of Toronto and staffed by Toronto police leaders, emergency services and others who have handled massive gatherings including the Raptors’ NBA championship parade in 2019.

“There may be some who will say we’re over-preparing, and that’s fair,” Green said.

“But we know based on what’s happened in other places, better to be over-prepared than under-prepared.”

Metrolinx, the agency for Ontario’s GO Transit system, has also added extra trips and extended hours in some regions to accommodate fans looking to travel home.

A day before Swift’s first performance, the city began clearing out tents belonging to homeless people near the venue. The city said two people were offered space in a shelter.

“As the area around Rogers Centre is expected to receive a high volume of foot traffic in the coming days, this area has been prioritized for outreach work to ensure the safety of individuals in encampments, other residents, businesses and visitors — as is standard for large-scale events,” city spokesperson Russell Baker said in a statement.

Homeless advocate Diana Chan McNally questioned whether money and optics were behind the measure.

“People (in the area) are already in close proximity to concerts, sports games, and other events that generate massive amounts of traffic — that’s nothing new,” she said in a statement.

“If people were offered and willingly accepted a shelter space, free of coercion, I support that fully — that’s how it should happen.”

This report by The Canadian Press was first published Nov. 13, 2024.



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‘It’s literally incredible’: Swifties line up for merch ahead of Toronto concerts

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TORONTO – Hundreds of Taylor Swift fans lined up outside the gates of Toronto’s Rogers Centre Wednesday, with hopes of snagging some of the pop star’s merchandise on the eve of the first of her six sold-out shows in the city.

Swift is slated to perform at the venue from Thursday to Saturday, and the following week from Nov. 21 to Nov. 23, with concert merchandise available for sale on some non-show days.

Swifties were all smiles as they left the merch shop, their arms full of sweaters and posters bearing pictures of the star and her Eras Tour logo.

Among them was Zoe Haronitis, 22, who said she waited in line for about two hours to get $300 worth of merchandise, including some apparel for her friends.

Haronitis endured the autumn cold and the hefty price tag even though she hasn’t secured a concert ticket. She said she’s hunting down a resale ticket and plans to spend up to $600.

“I haven’t really budgeted anything,” Haronitis said. “I don’t care how much money I spent. That was kind of my mindset.”

The megastar’s merchandise costs up to $115 for a sweater, and $30 for tote bags and other accessories.

Rachel Renwick, 28, also waited a couple of hours in line for merchandise, but only spent about $70 after learning that a coveted blue sweater and a crewneck had been snatched up by other eager fans before she got to the shop. She had been prepared to spend much more, she said.

“The two prized items sold out. I think a lot more damage would have been done,” Renwick said, adding she’s still determined to buy a sweater at a later date.

Renwick estimated she’s spent about $500 in total on “all-things Eras Tour,” including her concert outfit and merchandise.

The long queue for Swift merch is just a snapshot of what the city will see in the coming days. It’s estimated that up to 500,000 visitors from outside Toronto will be in town during the concert period.

Tens of thousands more are also expected to attend Taylgate’24, an unofficial Swiftie fan event scheduled to be held at the nearby Metro Toronto Convention Centre.

Meanwhile, Destination Toronto has said it anticipates the economic impact of the Eras Tour could grow to $282 million as the money continues to circulate.

But for fans like Haronitis, the experience in Toronto comes down to the Swiftie community. Knowing that Swift is going to be in the city for six shows and seeing hundreds gather just for merchandise is “awesome,” she said.

Even though Haronitis hasn’t officially bought her ticket yet, she said she’s excited to see the megastar.

“It’s literally incredible.”

This report by The Canadian Press was first published Nov. 13, 2024.

The Canadian Press. All rights reserved.



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Via Rail seeks judicial review on CN’s speed restrictions

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OTTAWA – Via Rail is asking for a judicial review on the reasons why Canadian National Railway Co. has imposed speed restrictions on its new passenger trains.

The Crown corporation says it is seeking the review from the Federal Court after many attempts at dialogue with the company did not yield valid reasoning for the change.

It says the restrictions imposed last month are causing daily delays on Via Rail’s Québec City-Windsor corridor, affecting thousands of passengers and damaging Via Rail’s reputation with travellers.

CN says in a statement that it imposed the restrictions at rail crossings given the industry’s experience and known risks associated with similar trains.

The company says Via has asked the courts to weigh in even though Via has agreed to buy the equipment needed to permanently fix the issues.

Via said in October that no incidents at level crossings have been reported in the two years since it put 16 Siemens Venture trains into operation.

This report by The Canadian Press was first published Nov. 13, 2024.

Companies in this story: (TSX:CN)

The Canadian Press. All rights reserved.



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