Wind shift lines refer to the visual representation of wind changes on the surface of the water. Simply put, they are the lines created by the movement of the water as the wind direction changes. Some synonyms for wind shift lines include wind ripples, wind waves, surface currents, and wind drift. Other synonymous phrases include wind shear, wind chop, and eddies, all of which describe the same phenomenon. Sailors, surfers, and other water-sports enthusiasts rely heavily on wind shift lines to determine the direction and strength of the wind. Understanding these subtle variations in the surface of the water can make all the difference in knowing when to set sail, catch a wave, or find shelter from the wind.