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Schools across the country closed early as officials warned of oppressive conditions

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Nearly 170 million Americans living across the central and eastern U.S. this week will be forced to endure dangerous heat as city officials declare emergencies and schools announce early closures.

In upstate New York, heat index values were expected to reach more than 100 degrees on Monday and Tuesday. It is the last week of school for districts there, and many districts have switched to half-day schedules.