More than 185 million Americans are on alert for life-threatening heat and humidity from South Dakota to Florida on Monday. Parts of Mississippi and Louisiana are on alert for heat indices -- what the temperature feels like with humidity -- of up to 120 degrees. Extreme heat warnings are in place for parts of South Dakota, Nebraska, Iowa and Illinois, where it could feel like over 110 degrees. From Boston to Philadelphia, it'll feel like the mid-90s to lower 100s through Wednesday. Extreme heat is considered the deadliest weather-related hazard in the U.S., according to the Fifth National Climate Assessment. About 2,000 Americans die each year on average from extreme heat, according to the Centers for Disease Control and Prevention. Here are heat safety tips from the CDC: Take precautions

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