Isotachs are lines that indicate what?

Isotachs are specifically defined as lines that connect points of equal wind velocity on a weather map. They are typically used in aviation and meteorology to represent the speed of wind at various altitudes. By visualizing these lines on a chart, pilots and meteorologists can assess wind patterns, which is crucial for flight planning and safety. Understanding wind velocity is essential for aircraft performance, as it affects takeoff, landing, and in-flight navigation.

In contrast, other options refer to different meteorological concepts. Lines of constant temperature are represented by isotherms, lines of constant pressure are known as isobars, and areas of high humidity are often depicted through various meteorological symbols or specific shading on a map, but not as isotachs.