Lake Effect Snowfall Ongoing in NW Indiana

There is some heavy snowfall occurring just north of South Bend, Indiana this morning, and here's why: frontongenesis.

Basically, the lake is warm and the air is cold, so the cold air-turned-semi warm is acting like a front to NW Indiana and therefore producing snow. Frontogenesis, after all, means to 'make a (weather) front'. Until the increased values of frontogenesis die down, we will likely continue to see snow fall over NW Indiana.