A high-pressure heat dome of record intensity over the central United States. (PolarWx) Comment on this story More than a third of Americans are under heat alert early this week as a monster heat dome stifles a huge swath of territory across the central United States, threatening the hottest temperatures of summer. As officials warn of “life-threatening” conditions, numerous records in parts of the Midwest could be reached as the heat continues to pummel the South.

Excessive-heat warnings stretch from Texas and Louisiana to Wisconsin and Minnesota, including the entire states of Iowa and Missouri. Cities under excessive-heat warnings include […]

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By Donato