Did you catch the "green" storm in South Dakota on Tuesday?
According to Earthsky.org, the sky normally appears blue due to the process of refraction. “During the day, particles in the air scatter more violet and blue light, and our eyes are more sensitive to blue.”
Meteorologist Scot Mundt with Nexstar’s KELO says that this same process produces a green sky, with the addition of one important ingredient.
“It’s caused by the sun’s rays being refracted by the hail (inside the storm) as the rays pass through the cloud,” Mundt explained. “It’s the same concept of how a rainbow forms. The sunlight is refracted as it passes through the raindrops, resulting in a rainbow.”
https://www.news10.com/.../storms-turned-south-dakotas.../
Original source can be found here.