Definitions and Impacts
Ice (Freezing Rain):
- < 1/4 in.: Windshields coated, icy bridges and overpasses, tree limbs sag or break, spotty power outages
- 1/4 in. - 1/2 in.: Larger coating of ice on windshields, most roads icy, large tree limbs sag and/or break, significant power outages
- > 1/2 in.: Roads impassable, tree damage, power lines or poles damaged, widespread or complete power outages
Sleet (Ice Pellets)
- < 1/2 in.: Windshields covered, slick bridges and overpasses
- 1/2 in. - 1 in.: Larger covering of ice on windshields, most roads slick and hazardous
- > 1 in.: Roads impassable, icy ruts in roadways, tree limbs sag or break, spotty power outages
- 1 - 3 in.: Slow traffic. Usually a thin sheet of ice develops on roads under the snow from snow compression, bridges and overpasses slick.
- 3 - 5 in.: Slower traffic. Overpasses slick, and most primary roads have slick spots. Secondary roads quite slick.
- > 5 in.: All roads become slick and traffic slows more. If snow is dense, can cause tree limbs and power lines to sag. Spotty power outages.