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43 million are under excessive heat watch as record temperatures are due to hit the West Coast

Around 43 million Americans are under an excessive heat watch and have been told to stay indoors as record-high temperatures are expected to hit the West Coast for Labor Day weekend.

Forecasters warned that a dangerous heat wave is headed for much of California, southern Nevada and western Arizona over the next three days, with temperatures soaring to around 115 degrees. 

California is bracing for what could be one of its hottest days in history, at a time when the Golden State is already under the grip of dozens of mammoth wildfires which have so far destroyed more than 1.5 million acres. 

Fears are mounting that respite from the intense heat will be hard to come by after an August heatwave caused rolling blackouts, cutting the power to much-needed air con units.

Around 43 million Americans are under an excessive heat watch and have been told to stay indoors as record-high temperatures are expected to hit the West Coast for Labor Day weekend

Around 43 million Americans are under an excessive heat watch and have been told to stay indoors as record-high temperatures are expected to hit the West Coast for Labor Day weekend

The National Weather Service issued excessive heat warnings for much of the Southwest including Utah, Arizona, Nevada and California.

Sweltering temperatures are forecast to be 20 to 25 degrees higher than normal, with several areas likely to record their hottest days ever.  

The heat watches are forecast to start in the valleys and mountains Friday before reaching coastal areas Saturday, according to NWS.

Sunday will be the hottest day when temperatures inland could reach around 115 degrees. 

Los Angeles is forecast to be one of the hardest-hit regions, with temperatures soaring as high as 120 degrees Sunday, while Phoenix and Las Vegas could see highs of around 117. 

Hopes of temperatures cooling as night falls are limited, with overnight lows still expected to be in the 70s and 80s in LA.  

UCLA climate scientist Daniel Swain told CNBC he is ‘seriously concerned’. 

‘I am seriously concerned about this heatwave throughout California,’ he said.

‘All-time record highs are plausible in Central Valley [and] across parts of SoCal. Over a million acres are actively burning across NorCal, and we’re still in the middle of a pandemic.’   

The National Weather Service issued excessive heat warnings for much of the Southwest including Utah, Arizona, Nevada and California. The map shows temperatures past 110 Monday along the West Coast

The National Weather Service issued excessive heat warnings for much of the Southwest including Utah, Arizona, Nevada and California. The map shows temperatures past 110 Monday along the West Coast 

California is bracing for what could be one of its hottest days in history, with temperatures in LA soaring as high as 120 degrees Sunday. Pictured Friday's forecast as the heat watch begins

California is bracing for what could be one of its hottest days in history, with temperatures in LA soaring as high as 120 degrees Sunday. Pictured Friday’s forecast as the heat watch begins

The California Independent System Operator, which operates California's power supply, has urged residents to conserve electricity from 3 p.m. to 9 p.m. PST each day over the three-day weekend to help prevent the likelihood of rolling blackouts. Power lines in LA n Thursday

The California Independent System Operator, which operates California’s power supply, has urged residents to conserve electricity from 3 p.m. to 9 p.m. PST each day over the three-day weekend to help prevent the likelihood of rolling blackouts. Power lines in LA n Thursday 

NWS LA warned residents that ‘all daytime outdoor activities should be limited or canceled’ as fears grow that a lack of respite from the heat will cost lives. 

It also warned of ‘extreme stress on our power infrastructure [which] may lead to power outages.’ 

The California Independent System Operator, which operates California’s power supply, has urged residents to conserve electricity from 3 p.m. to 9 p.m. PST each day over the three-day weekend to help prevent the likelihood of rolling blackouts. 

It is also asking utilities to postpone maintenance on generating stations so all available power supplies are at the ready. 

The high temperatures spark concerns about the threat of yet more wildfires, while the state continues to be ravaged by some of the biggest in its history and emergency crews are still grappling to bring them under control. 

The Golden State is already under the grip of dozens of mammoth wildfires which have so far destroyed more than 1.5 million acres. The LNU fire in August

The Golden State is already under the grip of dozens of mammoth wildfires which have so far destroyed more than 1.5 million acres. The LNU fire in August

Wildfires spread across California last month as the state suffered an intense heatwave - a heatwave that was less dangerous than the one experts say is on its way

 Wildfires spread across California last month as the state suffered an intense heatwave – a heatwave that was less dangerous than the one experts say is on its way

A home ravaged and car burnt out by the CZU August Lightning Complex Fire Friday in Boulder Creek

A home ravaged and car burnt out by the CZU August Lightning Complex Fire Friday in Boulder Creek 

Wildfires spread across California last month as the state suffered an intense heatwave – a heatwave that was less dangerous than the one experts say is on its way. 

More than 875 wildfires ripped through the state sending thousands of residents fleeing their homes before they were destroyed.

Two of the wildfires grew to become the second and third largest in the state’s history with the LNU Lightning Complex Fire so far burning bmore than 375,000 acres and the SCU 391,000 acres.

The National Guard was activated to help bring the blazes under control and firefighters flew in from Australia and other states as Governor Newsom pleaded for more resources.  

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