what is going on up There?

On the heels of a snow squall exiting the stage, came lines and swoops and fluffy bits. What the heck was going on up there in the atmosphere. Were human pilots doing "loop the loops", or was Ma Nature being a little giddy? 

She has been throwing snow showers at us about every 15 minutes for the last 2 days. They never amount to much but for a few minutes it looks like the blizzard of the century has finally arrived, and then out comes the sun again.