Snow cannon
A snow cannon is a device used to make artificial snow. It relies on atomizing water with compressed air and allowing it to condense into snow.
Water-compressed air nozzle
This device consists of a water nozzle into which a high pressure jet of air inserted. Water flows from the nozzle and the air under high pressure causes the water to break up into tiny droplets (almost a fog). If the surrounding air temperature near or below freezing, the droplets of water tend to evaporate and rapidly cool to point where tiny drops are formed. this methods work when the ambient air is at 0°C (32°F) or lower.
If the humidity is low, artificial snow can be made when the temperature is as high as 1.1°C (34°F). This is possible because of the rapid evaporation and evaporative cooling caused by the low humidity.