A nor'easter announces itself in the Hackensack valley hours early, the sky going flat and low over the Northern Valley before a single flake falls. Tjk Landscape Inc watches that sky from Dumont and works accordingly: plowing, shoveling, walkway clearing and salting all winter, then mowing, trimming, edging and cleanups the rest of the year. Summer is the opposite kind of weather — thunder stacking up in the west by four in the afternoon, everyone racing the rain to finish a cut. Both seasons come down to timing, and timing is worth being proud of. A yard tended on the right day and a drive cleared on the worst one are the same service in two coats.