What is a heat dome and how does it cause heatwaves?

An intense heatwave is expected to envelop much of the central and eastern United States this week due to a heat dome, with temperatures potentially reaching 46 degrees Celsius (115 degrees Fahrenheit) in some areas. Over 60 million people are under heat alerts, and cities like New York, Philadelphia, and Washington, D.C. are bracing for dangerously high conditions coinciding with Fourth of July celebrations. Authorities are implementing emergency measures, including cooling centers and hydration support, to help residents cope with the extreme heat.

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