When this cold air flows over the warmer Great Lakes, an unstable atmosphere develops -- we meteorologists call it the "Great Lakes Aggregate."

However, you really don't want to see the real thing hanging from your gutters because, eventually, roof damage and water in your home can result. Icicles are pretty, but you don't want them hanging from your gutters. (WDIV)We usually start seeing icicles form all around town after we get a lot of snow and temperatures are below freezing. Over time, that ice builds up (it's then called an ice dam), and water starts dripping over the edge and freezing, forming icicles. Icicles can lead to roof damage and water in your home.

Showers and a cold front are in the forecast during the Detroit Grand Prix 2018.