AT least two people died and over 200 were hospitalized as temperatures in Seattle soared to 108F on Monday.
More than 230 deaths have been reported in British Columbia since Friday as parts of Canada also sizzled in the “historic” heat dome.
A 65-year-old and 68-year-old died from the heat, according to the Seattle Kings County Medical Examiner’s office.
Coroners said the cause of death was hypothermia as their bodies “dangerously overheated”, the Seattle Times reports.
Around 223 people visited the emergency room for heat-related illness.
It’s reported that around 10 percent of visits were heat-related on Monday, according to public health data.
And, emergency services dealt with 165 heat-related calls.
Medics only handled 91 calls in 2020, according to a Seattle and Kings County spokesperson.
It's reported that at least 676 people visited the hospital in Washington state across the weekend as Americans on the West Coast sweltered.
Meanwhile, in British Columbia, more than 230 deaths have been reported since Friday as temperatures hit three figures, CNN reports.
Chief Coroner Lisa Lapointe said: “Since the onset of the heatwave late last week, the BC Coroners Service has experienced a significant increase in deaths reported where it is suspected that extreme heat has been contributory.”
In Lytton, a temperature of 117.5F was recorded on Monday – the highest temperature ever recorded in Canada.
It’s about 48 degrees above what is normal for this time of year.
In downtown Vancouver, a temperature of 101.5F was recorded on Monday – up from 98.6 on Saturday.
Forecasters also warned of extreme heat in Calgary, Edmonton and Prince George.
The once-in-a-millennium temperatures are the result of a high-pressure jet stream known as a "heat dome".
They are formed when vast areas of sweltering heat become trapped.
The larger a heat dome grows, the longer the heatwave lasts.
The phenomenon only happens once every 1,000 years, according to CBS News.
Senior climatologist David Phillips told AFP: "It's a desert heat – very dry and hot. It's not just a one-day wonder. It's a seven-day kind of thing,
"We are the second coldest country in the world and the snowiest. We often see cold snaps and blizzards but not often do we talk about hot weather like this. Dubai would be cooler than what we're seeing now."
It comes after the National Weather Service said it would be the hottest day for Seattle and Portland as all-time highs were likely.
In Eugene, Oregon, the US track and field trials were halted on Sunday afternoon after heptathlete Taliyah Brooks left the field in a wheelchair.
Fans were also asked to evacuate the stadium due to extreme heat.
Motorists were warned about potential delays on highways as maintenance teams gave bridges cold showers so iron beams wouldn't expand and buckle.
In Portland, power cables supporting streetcars melted in some areas.
Forecasters also warned of increased fire risk as temperatures were up to 45F above normal.
Experts urged residents to use cooling centers and avoid any outdoor activity.
The National Weather Service issued excessive heat warnings throughout most of the Northwest, Northern Great Basin.
Warnings stretched down the Pacific coast to western parts of Nevada and interior California.
Portland General Electric said about 3,000 customers were without electricity in the greater Portland area on Sunday afternoon.
Puget Sound Energy reported 3,400 customers down in the greater Seattle area.
Several Covid-19 testing sites were also closed in the city during the weekend because of the hot temperatures.
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