A nor'easter arrives in Peabody sideways, wind off Salem Sound pushing the flakes flat across the office lots at Centennial Park. All-Pro Snow Company Inc. runs straight through the middle of that — plowing lots, clearing walkways, spreading salt while the storm is still writing itself. Working during a storm rather than after it is the whole discipline: stay ahead, and the pile never becomes a wall. Businesses open, employees park, doors swing on a Tuesday like nothing happened. That is the aim every time — a lot that looks like it never snowed at all.