What term describes a line of equal wind speed?

What term describes a line of equal wind speed?

• A. Isohyet
• B. Isotach
• C. Isotherm
• D. Isobar

Answer: (B)

Lines that connect places with the same meteorological value are called isopleths. When the value is wind speed, that specific line is called an isotach. Isotachs help you see where winds are uniform in speed and where the speed changes rapidly—the jet stream, for example, shows up as closely spaced isotachs indicating very strong winds. Wind barbs on the map show direction and speed, while isotachs give a contour picture of the speeds themselves. The other terms refer to different quantities: isohyets map equal rainfall, isotherms map equal temperature, and isobars map equal atmospheric pressure.

Lines that connect places with the same meteorological value are called isopleths. When the value is wind speed, that specific line is called an isotach. Isotachs help you see where winds are uniform in speed and where the speed changes rapidly—the jet stream, for example, shows up as closely spaced isotachs indicating very strong winds. Wind barbs on the map show direction and speed, while isotachs give a contour picture of the speeds themselves. The other terms refer to different quantities: isohyets map equal rainfall, isotherms map equal temperature, and isobars map equal atmospheric pressure.