What’s Going on With The Snow in My Backyard?

Something weird is happening with what little snow is left in my backyard and I can't figure out how to explain it.

With all the rain we got a week ago in Southern Maine, the snow in my backyard all melted away. We've had a couple of rounds of light snow that just put a dusting on the lawn and driveway. Not even enough to measure an inch, so you can imagine how surprised I was to look out my window into the backyard and see this.

A few days prior to me taking these photos, the lawn was down to the grass. No snow whatsoever. Then we got a couple of rounds of light snow, which you can see the remnants of on the lawn. On the far right is drainage so that explains the snow build up there in that little channel, but what sits in the middle of the lawn baffles me.

Somehow, a mini snow pile formed that seems to be about an inch or two tall and sticks out like a sore thumb from the rest of the lawn. At first I thought maybe something was left on the lawn that this snow covered, but I know for a fact there was nothing on the lawn before we got more snow.

This little pile of snow buildup stands out like an island on the lawn. It has been so cold that it's pretty much frozen solid. I kicked it with my boot and the best that happened was it left a footprint. It appears there are some footprints of some sort of animal in this snow mound too.

I've tried all kinds of Google searches and haven't found any answer to what's going on here, but I'm sure there's some sort of scientific explanation for this weird phenomenon happening in my backyard.

Got any ideas of how this formed? Let me know in the comments or on our Facebook page. Otherwise I'm going to blame aliens for this.