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Dangerous heat prevails across US as Tropical Storm Fred threatens South

03:42

From coast to coast, more than 121 million Americans are waking up to another day of extreme heat. Meanwhile, Tropical Storm Fred has formed near Puerto Rico, putting Florida and other parts of the South on alert. NBC’s Kristen Dahlgren reports from Central Park, now under a rare excessive heat warning, and TODAY’s Al Roker has the forecast.