CHICAGO – Scores of millions across central and eastern United States are bracing for the summer’s first “heat dome,” set to envelop the region this weekend and persist through next week. This weather phenomenon will trap extreme heat and humidity, affecting an estimated 170 to 200 million people.
Immediate Impact
The heatwave’s arrival coincides with the first day of summer, ushering in temperatures at or above 100°F (37.7°C) in numerous cities as it progresses eastward. Forecasters predict no relief until the high-pressure system, acting as a “lid,” eases by next weekend.
Residents are urged to remain indoors to stay cool, even after sunset. “It will be exceptionally warm at night with little relief once the sun goes down,” stated Bernie Rayno, chief on-air meteorologist at AccuWeather. He noted that urban areas might struggle to see nighttime temperatures dip below 80°F, which could strain those without air conditioning.
Key Details Emerge
Heat domes occur when high atmospheric pressure compresses warm air, pushing it to the surface. These events have become more frequent in the US, exacerbated by rising global temperatures due to climate change.
Extreme heat has claimed more lives in the US since 1995 than hurricanes and tornadoes, with 238 fatalities last year alone, according to National Weather Service data.
Jonathan Porter, AccuWeather’s chief meteorologist, emphasized the heightened risk of heat-related illnesses. “There’s an amplified risk because this is the first heat wave of the year for millions, and their bodies are not yet acclimated,” he said.
By the Numbers
- 170-200 million: People affected by the heat dome
- 100°F (37.7°C): Expected temperatures in many cities
- 238: Heat-related deaths in the US last year
Regional Implications
More than 40 million people were already under heat alerts by Friday afternoon as temperatures soared across the Midwest. Kansas, Nebraska, and Iowa were particularly affected, with temperatures exceeding 90°F.
The heat is expected to extend north and east into Minnesota, Wisconsin, Illinois, and Missouri by Saturday, with Ohio, Pennsylvania, and New York experiencing peak temperatures by Sunday. By early to midweek, the heat will reach as far east as Maine.
Expert Analysis
Ashley Ward, director of the Heat Policy Innovation Hub at Duke University, highlighted the dangers of sustained high temperatures. “Your body needs a reprieve,” she told the Associated Press. Without cooler nighttime temperatures, the risk of heat illness and even mortality increases significantly.
Background Context
Some states and municipalities have established cooling stations to assist vulnerable populations, particularly those without homes. However, only a few states have legal protections for outdoor workers, such as mandatory shade and water breaks.
Phoenix, Arizona, the hottest US city, has implemented regulations requiring access to air conditioning. In contrast, Florida recently banned municipalities from enacting heat protections, following lobbying from business interests.
What Comes Next
The ongoing heatwave underscores the urgent need for adaptive measures to combat extreme weather events, which are becoming more frequent due to climate change. As temperatures rise, communities must prioritize public health and safety, ensuring access to cooling resources and protective regulations for outdoor workers.
The situation will continue to develop, with meteorologists closely monitoring the heat dome’s progression and its impact on affected regions.