Midsummer afternoons in Grant precinct come with thunderheads stacking up in the west, and the trick is finishing before they arrive. Broadway's Lawn Enforcement moves through the day's mowing, trimming and edging with an eye on that sky, taking the open yards first and saving the shaded ones for last. Illinois heat can turn turf brittle by August, so blades stay sharp and the cut stays tall enough to hold a little moisture in the crown. When the storm finally breaks, the grass is standing even and the walks are clear of everything the mower threw. There is an order to a finished yard that no weather can argue with.