Black ice is a thin layer that forms on surfaces such as roads, sidewalks and driveways when temperatures are 30 degrees or lower.

Drone footage shows a winter storm that brought rare snow and ice to Dallas and other parts of Northern Texas.

A winter storm warning was issued for large parts of North Texas on Thursday, as snow and sleet will fall across large parts of North Texas. Two to 4 inches of snow and sleet combination looks most likely for the Dallas-Fort Worth area with more in the north and northeast parts of the region. More wintery weather is also forecasted for Friday.