There's some cool science behind this experiment. Author: Brad Panovich Updated: 6:35 AM EST December 31, 2020 BEECH MOUNTAIN, N.C. — As a kid, I grew up loving snow. That's why I got into meteorology. So about 11 years ago, I built my first snow gun, and then about eight years ago, I upgraded to my combo gun. I've been able to make snow in my backyard for fun but also for the science of what it's like to make snow. The combo gun combines air and moisture inside a chamber and by decompressing it, ice crystals form and then fall to the ground.