A historic, record-shattering March heat wave, driven by an intense “heat dome,” is expanding across the United States.
The event has already broken all-time March temperature records in 14 states and set hundreds of local records.
The heat wave’s vast geographic scope may make it one of the most expansive in U.S. history, rivaling events like the 2012 and 2021 heat waves.
While the dome will eventually shift, it highlights escalating climate risks and the dangers of unseasonal extreme heat to public health and infrastructure.
In a startling climatic event, a massive and persistent “heat dome” has shattered temperature records across the western and central United States this month, with forecasts showing its eastward expansion could make it one of the most geographically expansive heat waves in American history. The phenomenon, an intense high-pressure system that traps and compresses hot air like a lid, has propelled temperatures 20 to 30 degrees Fahrenheit above normal, delivering summer-like heat weeks ahead of schedule. From the Southwest to the Plains and beyond, this unrelenting wave is challenging historical benchmarks and delivering a potent signal of a warming climate’s capacity to disrupt seasonal norms.
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