An ice storm is a kind of winter storm that is not a snowstorm or a rainstorm.Ice storm occur when there three layers of air in the atmosphere. First, there's a top layer that is very clod.Here is syarts snow.Then the snow hits a layer of warmer air where it melts and turns into rain. Fanally, there's a third layer of very cold air near the ground. Because ot this layer if cold air, the rain instantly turns to ice when it hits the ground.