Dangerously hot conditions expected as heatwave strikes south-west US

Area from south-east California to central Arizona see will extreme heat, with temperatures topping out at 113F in Phoenix

Parts of California, Nevada and Arizona are expected to bake this week as the first heatwave of the season arrives with triple-digit temperatures forecast for areas including Phoenix, which last summer saw a record 31 straight days of at least 110F (43.3C).

By Wednesday, most of an area stretching from south-east California to central Arizona will see easily their hottest" weather since last September, and record daily highs could be seen from Las Vegas to Phoenix, the National Weather Service said late on Monday.