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‘Rex Block’ keeps things dry as local firefighters call for caution on outdoor burns | CBC News

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A weather phenomenon known as a Rex Block helped make for a very arid month of May in southwestern Ontario, with firefighters in the London area keeping a close eye on the fire threat while considering an outdoor burning ban. 

According to CBC’s climate dashboard, which you can use here, the maximum temperature over the next few days will be about 32 C, which is 10 C above average. 

That will follow what was a very dry May. 

Monica Vaswani is a meteorologist for Environment Canada. She said the Rex Block is a mass of high-pressure air that essentially stops other weather systems from blowing in. Right now, a Rex Block is pretty much parked over southwestern Ontario. 


“We’ve only seen about five per cent of what you would normally see in terms of rainfall for the entire month of May,” she said. “It’s pretty unusual.” 

Vaswani said a normal rainfall amount for May would be about 89.4 mm. However only 4.1 mm of rain fell in May. It’s not a record, but certainly conditions are still unusually dry. 

There is a chance of some rain over the weekend in the London region, with forecasts calling for a 40 per cent chance on Saturday and a 30 per cent chance on Monday. 

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Temperature are also expected to dip as the weekend wraps up, with highs on Sunday and early next week expected to be in the mid-20s. 

But until the rain comes, firefighters will continue to keep a close eye on the fire threat. 

Natural Resources Canada has an “extreme” fire danger rating in place for most of southern Ontario at a time when Alberta and Nova Scotia are dealing with stubborn forest fires. 

Ron De Brouwer is the fire chief for Lucan Buddulph. He holds regular discussions with other Middlesex County fire chiefs. He said for now, they’ve decided a complete ban on outdoor burning isn’t needed. However he also said one will likely be put in place if the dry conditions continue. 

“We’re not in a crisis position yet,” he said. 

Each municipality has its own outdoor burning rules, which property owners should consult before doing any burning. In Lucan, any fire with a flame higher than three feet requires a burning permit. If a burn ban is put in place, no permits will be issued across Middlesex County, said De Brouwer.

Difficult conditions for firefighters

On Thursday, firefighters were called to a barn fire at a horse stable just west of London in the rural community of Delaware. The cause of the fire is under investigation and there’s nothing to suggest it was caused by the warm weather.

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However Middlesex County fire chief Colin Both told CBC News the heat and high winds made for challenging fire-fighting conditions.

“We definitely train for this but it’s a fact of our job,” he said. “We make sure we hydrate and we go into our rehabilitation cycles to make sure our firefighters are OK.” 

Both said the stable’s owners were able to get all the horses out safely before the flames destroyed two barns.

Middlesex County firefighters survey the damage of a barn fire just west of London on Thursday.
Middlesex County firefighters survey the damage of a barn fire just west of London on Thursday. (Andrew Lupton/CBC)

London Fire Deputy Chief Matt Hepditch said outdoor burning may not be a good idea with conditions so dry.

“Londoners should take extra care if they are participating in open-air burning,” he said in a statement to CBC News. “If you don’t have to have an open burn in the heat, then don’t.”

He said anyone who chooses to burn should keep a bucket of water, a garden hose or a portable fire extinguisher close by.

Brown lawns, don’t worry

Kyle Mcintyre runs a lawn care business and he’s seen plenty of lawns turn brown over the past few weeks. 

“Things are definitely getting pretty crispy out there,” he said. 

While some owners are happy to irrigate to keep the lawn looking green, Mcintyre said some of his clients are reluctant to water due to the cost. He said letting the lawn get a little brown shouldn’t be a problem. 

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“Once we do get some rain you’d be surprised how quickly it comes back to life,” he said. 

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