glen arbor

user GlenArborArtisans / YouTube

While temperatures are (finally) starting to climb out of subzeros across Michigan, signs of the so-called polar vortex – a low-pressure system that brought arctic temperatures across the country – are still lingering throughout the state.

For instance, boulder-sized ice balls have taken hold of the shores of Lake Michigan. Here’s a video captured on the lake’s coast in Glen Arbor, Michigan:

As MLive’s Heidi Fenton reported, the chunks form when large ice sheets break off into smaller pieces of ice. When waves hit the ice sheets, the ice chunks form into perfectly round, frigid spheres, with some estimated to weigh about 75 pounds.

If temperatures stay low enough, the ice balls – which our webmaster claims look exactly like chocolate truffles he has at home – may continue to grow, AccuWeather.com reported:

"It's possible that the ice is accreting like a snowball or like a hailstone, and that they keep growing," said AccuWeather.com Meteorologist Jim Andrews.