Smoke particles from wildfires enhance the colour of a sunset as a motorist travels on Highway 97C near Logan Lake, B.C., on Thursday, July 15, 2021. Above average temperatures for many parts of B.C. aren't expected to ease soon and Environment Canada says there is no hint of showers until at least the weekend for some regions of southern B.C. hit hard by wildfires. THE CANADIAN PRESS/Darryl Dyck

Fires in Western Canada creating own weather systems, experts say

Fires in Western Canada creating own weather systems, experts say

VANCOUVER — A combination of intense heat and drought conditions is causing wildfires in Western Canada to generate their own weather systems, experts say.

Michael Fromm, a meteorologist with the United States Naval Research Laboratory, said the phenomenon is known as a pyrocumulonimbus firestorm and has been tracked this year in British Columbia, Saskatchewan Alberta, Manitoba and Ontario.

Scientists have been tracking the storms since May. The first one was seen this season in Manitoba, Fromm said in an interview Monday.

The Village of Lytton in B.C. saw firestorms on two successive days in late June, he said.

“It was probably the single largest pyrocumulonimbus storm of the year so far,” he added.

“In fact, we’re still tracking the smoke plume from that storm as it’s travelling around the world and it’s about to kind of come full circle back over USA and Canada.”

An abundance of fuel, heat and wind create perfect conditions for the firestorms.

Lytton hit a Canadian temperature record of 49.6 C the day before a wildfire erupted there, destroying much of the community.

“When you get all those three things together, you get the perfect triple that we call fire weather,” Fromm said. “So, hot, dry and windy.”

Simon Donner, a climate scientist from the University of British Columbia’s geography department, said the storms also generate lightning that cause more fires.

“The fire creates the storm, and then the storm creates lightning, which can cause more fires,” he said.

“That runaway feedback is the dangerous part.”

Above average temperatures for many parts of B.C. aren’t expected to ease soon. Environment Canada said there is no hint of showers until at least the weekend for some southern regions that have been hit hard by wildfires.

Emergency Management BC said more than 250 active wildfires were burning in B.C. on Monday afternoon. Since the fire season began April 1, 4,142 square kilometres of land has been charred from the 1,216 wildfires that had started as of Sunday night.

At that time, there were 58 evacuation orders in effect, which affected 4,260 properties. Another 83 evacuation alerts were in place, meaning people living at more than 17,500 properties had been told they should be ready to leave their homes on short notice.

The risk remained high to extreme over most of southern B.C. on Monday. The B.C. Wildfire Service said 40 blazes were ranked as fires of note, meaning the flames were either highly visible or posed an immediate safety risk.

B.C. is to get more help Tuesday in battling the fires, with 34 Australian firefighting personnel joining 113 from Quebec and 101 from Mexico.

The Australian contingent includes a nine-person incident management team and technical specialists.

The weather office is predicting lighter winds over several of the most challenging fires, including the 68-square kilometre Nk’Mip Creek blaze in the south Okanagan between Oliver and Osoyoos. But forecasters said temperatures there won’t budge from the mid- to high-30s all week, and there’s no sign of rain.

Showers could dampen parts of southeast B.C., where fires on both sides of Upper Arrow Lake have forced evacuation orders or alerts for hundreds of properties.

However, Environment Canada said the chance of rain is just 30 per cent.

B.C. Wildfires 2021