Lake Michigan does most of the work. A west wind crosses forty miles of open water, gathers what it can carry, and lets it go over the county in bands you can watch marching inland. Northern Sprinkler Systems & Snowplowing keeps hours on the other side of that arithmetic — plow lights on at three in the morning, driveways opened end to end, walkways cut back to their true width, salt laid where the afternoon melt will run and refreeze by dark. The reward is small and complete: someone steps out at seven into a clean lane of pavement and never has to think about the night at all. Storm after storm, from the first squall of November to the last gray pile in April.