Winter storm threatens 80m as US south faces heavy snowfall and closures

Up to 9in of snow expected in Arkansas and Tennessee as climate crisis leads to more frequent extreme weather cases

More than 80 million people across southern US states were on alert on Friday as a powerful winter storm that dumped heavy snow and glazed roads with ice across much of Texas and Oklahoma lumbered eastward.

Some governors have declared a state of emergency as the weather forced school closures across the region and unleashed havoc for traffic.