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Web(cnn) — more than 50 million people across the us are under heat alerts amid a brutal heat wave that has shattered records and caused multiple deaths across the west.

First, though, we're going to focus on the high temperatures.

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Webpersistent heat wave in the us shatters new records, causes deaths in the west and grips the east.

Webthe northeast and midwest, including new york city and boston, are bracing for what could be the hottest stretch of weather in 30 years this week as a sweltering heat dome settles over a large part of the nation.

Webtemperatures soared 15 to 20 degrees above normal monday afternoon and remained at elevated levels overnight.

A few dozen temperature records fell as a result, including daily record highs in.

As of monday, much of.

On monday, with hot temperatures also.

West with dangerous temperatures.

And to do that,.

Webrecent extreme weather includes devastating flooding in new england, which we'll hear about in a few minutes.

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