This week, nearly 100 million people in the United States will be affected by a record-breaking heat wave caused by the return of El Niño. Global average temperatures have set new records or tied existing ones for four days in a row, beginning July 3, indicating that the heat wave is not only affecting the United States, but the entire world. The National Weather Service has issued warnings for those in the affected areas to take precautions to stay safe in the heat.
