Blizzards are obviously related very closely to hurricanes, tornadoes, and weather fronts. For a blizzard to occur, there must be precise amounts of each of these things.

Snow storms can be caused by a warm front coliding with a cold front. This creates a low pressure zone. When clouds in the low pressure zone are filled with ice crystals, there are chances for a major blizzard. (Note: a warm front is basically a warm wind, and a cold front it a cold wind. When the two winds colide, they neutralize each other out in a way, and make a low pressure zone.)

Low pressure creates high powered winds, as the warmer air spirals into the low zone, and adds alot of movement. Therefore if a low pressure zone gets lower, the winds speed up.

For snow, there needs to be alot of moisture in the air. This can be gathered up if the low pressure zone goes over a large body of water, like an ocean or lake. This moisture will then cool off as it rises into the atmosphere.

How does snow form? Snow goes through a bit of change before it lands on the ground. First off, it starts in a very humid system (a lot of moisture). Then, the whole system has to fly over a cold pocket of air. Then, the moisture turns to ice crystals. Then the ice crystals combine together to form snow flakes. Finally, as soon as the snow flakes get too big to stay in the air, they fall to the ground.

More information about what an blizzard is can be found [here]

Information about major past blizzards can be found [here]

Blizzard links can be found [here]

More blizzard pictures can be found [here]

Information on how blizzards are classified can be found [here]