A third major heat dome is sweeping across the US this month, threatening 70 million people across the South and Midwest with temperatures between 95 and 105 degrees Fahrenheit. The event spans from the Gulf of Mexico coast through the Great Plains to the Midwest, with excessive heat advisories in effect across the affected region.

This marks the third intense heat dome to strike the country in roughly four weeks. The rapid succession of extreme heat events reflects a pattern increasingly linked to climate change, where persistent high-pressure systems stall over regions for extended periods, trapping hot air masses and preventing cooling overnight.

Heat domes pose immediate public health risks. Prolonged exposure to temperatures above 95 degrees Fahrenheit triggers heat exhaustion, heat stroke, and dehydration, particularly in vulnerable populations including the elderly, outdoor workers, and those without reliable air conditioning. Emergency rooms typically see surges in heat-related admissions during such events.

The frequency of these events has accelerated in recent years. Climate data shows that the number of heat dome events per summer has roughly doubled since the 1980s. Rising greenhouse gas concentrations trap more infrared radiation in the atmosphere, increasing baseline temperatures and making extreme heat events more intense and longer-lasting.

The repeated hits to the same regions within a month stress power grids as air conditioning demand spikes, potentially triggering rolling blackouts. Agricultural impacts mount as crops wither under sustained heat stress, threatening yields and food prices. Extended heat also intensifies drought conditions across the Great Plains, compounding water scarcity pressures.

Meteorological services across the National Weather Service and regional forecast centers are issuing heat advisories and excessive heat warnings. Public health officials are activating cooling centers and urging residents to check on neighbors and limit outdoor activity during peak heat hours.

The back-to-back nature of these heat domes underscores how climate change