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Yes.

To produce snow, you need two things: moisture and cold.

When air is cooled, its moisture precipitates out, so cold air contains very little moisture.
Warm air, if it passes over water or damp ground, picks up moisture.

To get a lot of snow, the cold air has to contact warm moist air.
For this to happen, one or both of them has to be moving -- usually as a front.

If the cold air is standing still, and a moist warm front approaches, the warm air, being lighter, rides up over the cold air. When the warm air gets cold from the cold air and the high altitude, its moisture drops out in the form of snow, sleet, or rain.
If it is cold enough you get a long steady snow.

If the warm moist air is standing still and a cold front approaches, the heavier cold air plows under the lighter moist air and forces it upward. Since the cold heavy air can move along the ground faster than warm air can, this often produces strong winds. In the summer this causes thunder storms and tornadoes. In the winter it can produce snow storms or blizzards.

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Keely Schneider

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Winter storms usually start along a what?

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