In wind shear alert phraseology, which wind is used to designate the wind near the boundary sensor location?

• A. Airport Wind
• B. Local Wind
• C. Boundary Wind
• D. Sensor Wind

Answer: (C)

In wind shear alert phraseology, the wind value used to represent conditions at the boundary sensor location is boundary wind. This designation exists because the boundary sensor captures the wind right at the edge of the measurement area where shear effects are most relevant for aircraft on approach or departure. Using boundary wind keeps the data tied to the specific, local conditions at the sensor rather than the broader airport wind, which can differ due to larger-scale influences. The other terms refer to broader or nonstandard notions—airport wind is the overall field wind, local wind is a general nearby flow, and sensor wind isn’t a standard designation—so boundary wind best communicates the exact, near-sensor conditions pilots need to assess potential wind shear.