Weather tracker: February heatwave breaks records in north and central US

Heat as high as 20C above normal is replaced by cold blast causing rapid temperature swings

Over the last few days, the central and northern US has experienced one of its most notable February heatwaves ever, as many February temperature records tumbled.

Half a dozen states recorded their highest February temperature, as did more than 130 towns and cities, including Minneapolis, Milwaukee, St Louis and Detroit.