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Story summary
- A major heat wave will affect large parts of the U.S. through the end of the week, potentially breaking more than 100 daily temperature records from Thursday to Sunday.
- CBS News meteorologist Nikki Nolan forecasts more than 50 record highs on Thursday alone.
- Phoenix may reach 100°F, breaking a 40-year record.
- The heat wave began earlier this week and may trigger severe storms in the Midwest by Friday.
