By two in the afternoon the thunderheads stack up over the Piedmont, white and enormous, and everybody working outdoors starts watching the sky. Jamdun Lawn & Landscaping LLC keeps moving anyway, finishing the Lawrenceville route ahead of the rain — mowing, string trimming, edging the walks, blowing the drive down clean. Between cuts there is mulch to spread, shrubs to shape and beds to pull back into line. The storm rolls through, steam lifts off the asphalt, and by evening the yards look greener for it. Summer here rewards anybody willing to work with the weather instead of against it.