Grueling heatwave sears Pacific north-west as Portland could top 102F

To have five-day stretches or a week-long stretch above 90 degrees is very, very rare for the Pacific north-west,' expert warns

Portland is facing another grueling heatwave with temperatures in the normally temperate Pacific north-west city expected to climb as high as 102F on Tuesday.

The Oregon city is one of the least air-conditioned in the US and officials have declared an emergency in response to the severe heat, opening cooling centers in public buildings, including emergency overnight shelters and installing misting stations in parks.