Complex sentence: The disadvantage of this type of sensor is that when the wind comes in the direction of a ultrasound path the flow around the arms introduce aerodynamic turbulences which perturbs the measures and the sensor will lose in accuracy.
Split into simpler sentences: The disadvantage of this type of sensor is when the wind come in the direction of one ultrasound path. Indeed, the wind flow around the arms introduce aerodynamic turbulences which perturbs the measures and the sensor will lose in accuracy.