Winter storms consist of wind, rain, freezing rain, sleet or snow. They can have different effects depending on how much precipitation falls and in what location. For example, in the South, a dusting of snow can be dangerous, while a larger snowstorm would be necessary to cause problems in the North.
A blizzard is an extreme winter storm. The National Weather Service defines a blizzard as a condition in which winds are 35 miles per hour or more and visibility is less than one-quarter mile because of falling and/or blowing snow.
Heavy snow or ice accumulation makes driving and walking dangerous during and after a winter storm because of slippery roads. Such accumulations also cause damage by downing power lines and trees and by causing floods. Overexertion from people shoveling snow or trying to walk through deep snow can lead to heart attacks.
In addition, winter storms can force people to use alternative sources of heat such as kerosene heaters. If these heaters are not working properly or if people use them inappropriately, there is a risk of fire or
carbon monoxide poisoning. 
