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No relief from the heat as many US cities will see record overnight temperatures
Roughly 100 million Americans are under heat alerts as forecasters warn of record-breaking temperatures and little overnight relief through midweek.
On Sunday, Billings, Montana, reached 111°F and Salt Lake City, Utah, hit 109°F, setting all-time temperature records as Extreme Heat Warnings remain in effect across the western and northern United States.
A persistent heat dome—an atmospheric phenomenon trapping hot air—built in the West last week and is now spreading extreme temperatures toward the Northeast, impacting roughly 100 million Americans.
The Aspen Acres Fire in Colorado is 35% contained amid dangerous conditions; health experts warn that recent cooler-than-normal weather may leave people less prepared for this heat, increasing illness risks.
Forecasters warned of "exceptionally rare" conditions as triple-digit temperatures spread across the northern Plains; Extreme Heat Warnings remain in place through Thursday for Minneapolis, Minnesota.
Temperatures are expected to remain 15 to 25 degrees above normal through next weekend with limited overnight cooling; climate scientist Daniel Swain called this a "long duration, widespread and high-intensity heat event" affecting millions.