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Excerpt:
Tens of millions of people across the midwest and east braced on Sunday for another sweltering day of dangerously hot temperatures as a rare June heatwave continued to grip parts of the US.
Most of the north-eastern quadrant of the country from Minnesota to Maine was under some type of heat advisory on Sunday. So were parts of Arkansas, Tennessee, Louisiana and Mississippi.
The temperature had already reached 80F (26.6C) in the Chicago area by 7.30am on Sunday, according to the National Weather Service. Forecasts called for heat indices of between 100 and 105F.
The heat index in Pittsburgh was expected to top 105F. The temperature in Columbus, Ohio, was 77F at 8.30am. Highs there were expected to reach 97F with a heat index around 104F.
