Records are broken in an area plagued by hot climates

By James FitzGerald, Raquel Mirador, bbc news

Trump fans brave scorching Arizona heat to attend event

Excessive heat warnings are set to expire this weekend after daily temperature records have been set across the southwestern US.

Extreme temperatures are expected to continue in California, Nevada and Arizona through Saturday.

An excessive heat warning in Las Vegas will expire Saturday night, with temperatures remaining around 115°F (46.1°C) on Saturday and dropping to 112°F (44.4°C) on Sunday.

Similar to last week’s trend, temperatures will remain high overnight, hovering around 80 degrees.

On Thursday, heat reached 113°F (45°C) in Phoenix. Record temperatures led to 11 people being taken to hospital while they waited to attend a Donald Trump rally on Wednesday.

Phoenix will see a slight relief after the heat advisory expires Friday night, but the high temperature remains in triple digits for Saturday at 108F (42.2C) and 104F (40C) on Sunday.

National Weather Service (NWS) alerts remain in effect Friday the widest areacovering a population of around 20 million people.

The heat marks the first round of dangerous temperatures this season with the possibility of excessive heat persisting into next week in some areas, according to the NWS Weather Prediction Center.

Scientists say extreme weather events are becoming more frequent and intense as a result of climate change.

Although the official start of summer is still two weeks away, the NWS has advised people in affected areas to limit outdoor activity and stay hydrated.

He previously warned there would be little relief overnight from the scorching temperatures.

On Thursday, NWS thermometers showed new highs for June 6 in places like Las Vegas and Death Valley. This last location reached 122°F (50°C).

The Clark County Fire Department, home to Las Vegas, responded to at least 12 calls since Wednesday related to heat exposure, the Associated Press reported. Nine of those people needed to be treated in a hospital.

In reporting the 113F (45C) reading at Sky Harbor, the NWS office in Phoenix said this exceeded the previous high for June 6 that was set in 2016.

Phoenix is ​​the hottest big city in the United States, and there were 645 heat-related deaths in Maricopa County last year.

Firefighters have been put on alert to immerse victims of heat stroke in ice. Some popular local hiking trails have been closed.

The graphic explains how a thermal dome works.  1) In calm and dry summer conditions a warm air mass is formed.  2) High pressure in the atmosphere pushes hot air downward.  3) The air is compressed and heated further.

The group of 11 Trump rally attendees were later released from the hospital, the Associated Press reported.

In preparation for a rally in Las Vegas on Sunday, where temperatures are expected to reach 104F, the Trump campaign told CNN they planned to double the number of EMS personnel on site, provide more than 38,000 bottles of water and an air-conditioned tent. .

The first heat wave of the year in the Southwest is the result of a heat dome: an area of ​​high pressure in which warm air is pushed down and trapped, causing temperatures to soar over large areas.

Temperatures are 20 to 30°F above average for this time of year.

While heat domes were once described as rare, they are becoming more common and intense due to human-induced climate change, scientists say.

The European Union’s Copernicus Climate Change Service announced Wednesday that the world has surpassed a full year of consecutive monthly heat records.

The climate change service also found that May marked the 11th consecutive month in which the global average temperature was at least 1.5°C above the pre-industrial average of the late 19th century, referring to a period before there were a significant increase in greenhouse gas emissions.

Scientists say the high temperatures were driven by human-caused climate change combined with the El Niño climate phenomenon.

“We are living in unprecedented times,” Carlo Buontempo, director of Copernicus, said earlier this week.

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