Though summer officially begins on Tuesday, millions of Americans have already been buffeted by triple-digit temperatures and dangerously high heat, which is only expected to continue as a second wave of extreme heat creeps into the eastern and southern U.S.
Last week, an enormous heat dome across the eastern U.S. and the Midwest created record high temperatures in several cities — and intensified the misery for some communities that were already battling power outages following a series of severe storms.
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