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A “heat dome” over western Canada and the U.S. Pacific Northwest sent temperatures soaring to new highs, triggering heat warnings from Oregon to Canada’s Arctic territories on Sunday.

More than 40 new temperature highs were recorded in British Columbia over the weekend, including in the ski resort town of Whistler. And the high pressure ridge trapping warm air in the region is expected to continue breaking records throughout the week.

Environment Canada issued alerts for British Columbia, Alberta and parts of Saskatchewan, Yukon and the Northwest Territories.

“A prolonged, dangerous, and historic heat wave will persist through this week,” it said in the warnings.

“Afternoon high temperatures will climb to the mid 30s today (Sunday), and will peak near 40 degrees Celsius in some regions by midweek.”

These temperatures are 10 to 15 degrees Celsius hotter than normal.

The U.S. National Weather Service issued a similar warning about a “dangerous heat wave” that could see record temperatures rise to more than 30 degrees Fahrenheit above normal in parts of Washington and Oregon states.

“The historic Northwest heat wave will continue through much of the upcoming week, with numerous daily, monthly and even all time records likely to be set,” it said in a statement.

Monday is expected to be the hottest day in big cities such as Seattle and Portland with all time record highs likely in both cities.

The highest temperature ever recorded in Canada was 45 degrees Celsius in two towns in southeastern Saskatchewan on July 5, 1937. And it could be broken in the coming days with temperatures in current hot spot Lytton, British Columbia — about 250 kilometers northeast of Vancouver — forecast to reach 46 degrees Celsius.

“I like to break a record, but this is like shattering and pulverizing them,” Environment Canada senior climatologist David Phillips told broadcaster CTV

“It’s warmer in parts of western Canada than in Dubai.”

Wildfire risks are elevated, and water levels in lakes and rivers are lower.

Stores reportedly sold out of portable air conditioners and fans, while cities opened emergency cooling centers and several COVID-19 vaccination clinics were canceled.

The British Columbia power utility, meanwhile, said electricity demand has soared to record levels as residents sought to keep cool.

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