Those are dendy's, not low ratio stuff. Snow covered interstate too.
https://lb.511mn.org/mnlb/cameras/camera.jsf?id=48976&view=minnstpaul&text=m&textOnly=false
Their discussion used the melting argument (which may be true briefly at onset) and ratios 8-9:1. Not sure how you look at that soundings and see that. Not to mention temps 29-30F.