More than 99% of CenterPoint Energy's Houston-area customers maintained power through the freeze, and ERCOT didn't order rolling outages.

Houston received between 1 to 4 inches of snow during a winter storm Tuesday morning, bringing wintry weather to a city that rarely sees it.

"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."

Weather forecasters and public agencies issued health and power loss warnings Tuesday as a “rare winter storm" gripped parts of the southern and eastern United States."A bitterly cold airmass will remain in place for much of the South and eastern U.