Tag Archives: expliqué

Qu'est-ce qu'un « dôme chauffant »? The extreme events explained

Qu'est-ce qu'un « dôme chauffant »? The extreme events explained
Intense concentrations of hot air trapped over North America killed hundreds of people in the Pacific Northwest last year

Comme le crise climatique rumbles, intense heatwaves are becoming more and more prevalent in the northern hemisphere.

Temperatures in Britain are set to soar in July while the southwestern states of the US suffered sweltering conditions in mid-June, with cities lke Phoenix, Arizona, and Las Vegas, Nevada, facing temperatures north of 37C and Texas’s power grid breaking usage records as 40m Americans fought to stay cool.

A meteorologist with the US National Weather Service told CNN that such extreme warmth as the world has already experienced this summer could be attributed to a phenomenon known as a “heat dome”.

Comme le nom le suggère, a heat dome occurs when high pressure traps concentrations of hot air over a given area and blocks other weather systems from moving in and offering relief, leading to concentrated, uncomfortable levels of heat.

Heat dome conditions are what led to last year’s brutal heatwave in the Nord-ouest pacifique, which killed hundreds of people in the US and Canada, breaking local temperature records across the region and starting a series of wildfires.

The climate emergency, driven largely by decades of burning combustibles fossiles, contributed to the red-hot heat and made it more intense, les scientifiques disent.

le 2021 Pacific Northwest heatwave would have been “virtually impossible” without the climate crisis, concluded World Weather Attribution, a group of climate scientists who measure the impact of human-caused warming on weather events.

À l'époque, politicians in affected areas reflected on the climate crisis.

Canadian prime minister Justin Trudeau warned that such events could become the norm unless more is done to avert rising global temperatures.

<p>High-pressure circulation in the atmosphere acts like a dome or cap, trapping heat at the surface and favoring the formation of a heat wave</p>

High-pressure circulation in the atmosphere acts like a dome or cap, trapping heat at the surface and favoring the formation of a heat wave

“We’ve been seeing more and more of this type of extreme weather event in the past years. So realistically, we know that this heatwave won’t be the last," il a dit.

That sentiment was echoed by Washington governor Jay Inslee.

“This is the beginning of a permanent emergency,” he told MSNBC. “We have to tackle the source of this problem, lequel est changement climatique."

The climate crisis is likely to make extreme heat events more frequent and more intense, rapports the US Environmental Protection Agency.

Residents are encouraged to stay inside and stay hydrated as much as possible when such high temperatures are in play, rather than venture out into the scalding sun and endanger their health.