The eastern part of the United States is facing severe heat, with New York predicted to reach temperatures close to 100 degrees Fahrenheit (38 degrees Celsius), feeling even more like 109 degrees Fahrenheit (43 degrees Celsius) when factoring in humidity. Cities such as Detroit, Washington, DC, and Boston will also endure temperatures 20 degrees above average as the holiday weekend draws near.

While not as elevated as Phoenix, the mix of heat and humidity generates uncomfortable and potentially hazardous conditions. Humidity diminishes the efficiency of sweating, an essential cooling process for the human body. Richard Allan, a climate scientist, states that high humidity during heatwaves hampers the body’s ability to cool itself effectively.

The National Weather Service has released severe heat warnings and watches, highlighting the gravity of the forthcoming weather. Daytime temperatures are expected to be high, and nighttime lows will offer minimal comfort, heightening risks of heat stress.

New York Mayor Zohran Mamdani underscored the necessity of a heat plan, urging individuals to ensure air conditioning access and to look in on those who are more vulnerable to heat-related health risks.

This intense heat in the US comes on the heels of Europe’s recent experience with unprecedented temperatures. The combustion of fossil fuels has exacerbated heatwaves around the globe, transforming moderate heat into more extreme conditions.

El Niño, a natural climatic phenomenon, may also play a role in this heatwave. It affects global weather systems, especially elevating temperatures in the northern US and certain regions of Canada. With El Niño officially recognized and anticipated to intensify, more extreme heat is expected in the upcoming months.