"It's called 'black ice' because it tends to look like the rest of the pavement on the road, although in reality, it's actually clear," the US Forest Service notes. "Black ice forms without creating bubbles, which allows it to blend in with any surface it forms over. Black ice is dangerous precisely because it's hard to detect."

A winter storm has brought a mixture of precipitation to Houston overnight, including snow and sleet. This wintry precipitation will end later this morning, and we will see some sunshine