Forecasters have issued excessive heat warnings on Wednesday lasting through Friday night for portions of southeast California, southern Nevada and Arizona.

“Temperatures well above average for the time of year — some spots as much as 10 to 20 degrees above average,” said Marc Chenard, a weather service meteorologist in College Park, Maryland, according to the Associated Press.

AccuWeather forecasters cautioned that the high temperatures will "increase wildfire danger."

"The combination of a bulge in the jet stream, high pressure building at most levels of the atmosphere and a storm offshore of California will allow the heat to build without any shower or thunderstorm activity for about 50 million people in the West through at least Thursday," AccuWeather reported.