Freezing rain occurs when rain falls through a layer of cold air near the ground, causing it to freeze upon contact with surfaces. This results in a coating of ice on roads, trees, and power lines, creating hazardous conditions. The formation of freezing rain typically happens when warm air rises over a layer of cold air. As the rain droplets pass through the cold air, they become supercooled and freeze instantly when they hit surfaces. This weather phenomenon can lead to dangerous travel conditions and power outages due to the weight of the ice on power lines and trees.