Looks like the snow was sticking to the tires as they rolled over in consistent intervals. Not sure but like it rides up a snow ramp compresses squishes sticks and repeat. Assuming the tires were cold and the snow had a little moisture in it the compresssed snow stuck and left that pattern. Hot Wax your tires with Swix Blue and that should eliminate those pesky ridges. ☃
Yea. While I don't know enough to dive into the chemistry and physics behind it, I can confirm this is normal and nothing to be concerned about. Has a lot to do with the temperature of the snow and the moisture content. It wasn't enough to stick to the tires, but was just enough to compress into small sheets and stay on the ground like that.
If you take the distance in between the cracks, multiply by the inverse square root of the crack's depth and substract the snowflake density per mm3 under the tire, you can obtain your speed, ambient temperature, and the BMI of the driver. Old trick.