New York City is bracing for a severe heat wave amid the July Fourth festivities and World Cup matches. Mayor Zohran Mamdani warned that these are ‘extremely dangerous conditions’ affecting every part of the city.

Temperatures are forecast to hit 100 degrees Fahrenheit, with heat indices pushing between 105 and 110 degrees by Thursday. With heat waves becoming more intense, cities like New York are enhancing their emergency plans, including setting up cooling centers and conducting outreach to vulnerable populations.

Philadelphia is also preparing for high temperatures during its World Cup match on July 4th. The city has moved the hours of its FIFA Fan Festival to the evening but matches will still kick off at times when it feels well above 100 degrees with heat and humidity.

The risk of heat-related deaths is increasing as extreme heat events become more frequent, according to a recent Yale University study. It found that heat-related deaths nearly doubled in the US over two decades, from an annual average of 2,670 between 2000 and 2009, to more than 4,000 between 2010 and 2020.

New York emergency departments are preparing for a surge in patients with acute heat illnesses. Preventive measures include drinking water before thirst, wearing sunscreen, and limiting alcohol consumption during festive days and sporting events.