Snow is formed when the cloud droplets freeze below its freezing point. Many things can affect the way the snowflake forms. The temperture, air currents and humidity can fix the shape and the size of the snowflake. Dirt and dust can get mixed up in the water and can affect the way the snowflake is weighed. Dirt and dust make the snowflake heavier, which causes cracks and breaks in the snowflake it is then easier for it to melt.
http://www.islandnet.com/~see/weather/elements/snowflakes.htm
Six-sided hexagon crystals are shaped in very high clouds. Needles or flat six-sided crystals are shaped in the middle height clouds. Many different types of six-sided shapes ae formed in the low clouds.
The tempertures which make these types of snowflakes are:
- 32-25 F - It makes thin hexagonal plates
- 25-21 F - It makes needles
- 21-14 F - Hollow columns
- 14-10 F - Hexagons with dents[sector plates]
- 10-3 F - Lacy Hexagonal shapes[Dendrites]
http://www.islandnet.com/~see/weather/elements/snowflakes.htm
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