Weather tracker: More than 70 million people under cold weather alerts in US

At least 27 die in weather-related circumstances in Pacific north-west as freezing temperatures, sleet and snow hit several states

More than 70 million people across the US were put under winter weather alerts this past week, from Oregon to Maine. Temperatures fell to -45C in some areas, and the National Weather Service (NWS) issued a wind chill warning across parts of Texas through last weekend, with warnings of hypothermia and frostbite from wind chills of -32C.

Additionally, nearly 10in (25cm) of snow fell across parts of Iowa, and other states across the midwest received six to 10in of snow last weekend.