Flurries are a light snow which falls for a short time. Snow which falls at different rates for short periods of time is known as showers.
Different rates means different speeds.
Thus, snow may fall quickly and heavily for a time and fall slowly for a time. Some snow may accumulate on the ground. Squalls are snowstorms which have heavy snow showers and only last for a short time. They also have strong, gusty winds. A good deal of snow may accumulate on the ground.