A thermal dome is a weather phenomenon in which high pressure atmospheric conditions have trapped air from the Pacific Ocean, heating the column of air while compressing it, like a lid on a pot.
This area of atmospheric pressure created a blocking pattern, sandwiching the high pressure between the areas of low pressure, pushing cooler air away from the thermal dome.
Usually, winds can move a thermal dome, creating a heat wave, but because this dome extends high in the atmosphere, the high pressure system is not easy to move and appears to be stationary.
While it is difficult to attribute isolated extreme weather events to climate change, which is based on a longer-term analysis, extremely rare events like this are expected to become more frequent due to the general increase in temperatures. global.
On Tuesday, June 29, Canada experienced its highest temperature on record at 121F (49.6C) – making it the third consecutive day that records have been broken.
The record heat has also led to record temperature drops overnight in some places, like Portland, Oregon, from 116F (46C) to 64F (17C).
The US National Weather Service has warned that “dangerously warm conditions” could last until Thursday, with Etat de Washington and Oregon both having seen temperatures well above 104F (40C) since Friday.
Canada saw 103 heat records broken Monday in the provinces of British Columbia, Alberta, the Yukon and the Northwest Territories.
AT face the high heat, dry ice is used to cool the water, people sleep in “cooling shelters” and a swimming pool in Seattle was closed because the surrounding bridge was “dangerously” hot.
British Columbia police said they responded to 65 sudden death calls since the start of the heatwave in the region on Friday.
“Vancouver has never experienced heat like this and unfortunately dozens of people are dying of it,” said Vancouver Police Sgt. Steve Addison.
Commenting on the crisis in Canada, BC Premier John Horgan said it was a “big lesson that the climate crisis is not a fiction”.
“It’s not a BC problem, it’s not a Canadian problem, it’s a global challenge,” he said.
“And we all need the citizens of the world to come together as we have done, quite frankly, to deal with a global pandemic. ”