X-Planes weather is controlled by three layers of values. The dataref's you're trying to use are an "aircraft local" interpretation of the layers. Use these to "set" the weather: sim/weather/ wind_altitude_msl_m[0] wind_direction_degt[0] wind_speed_kt[0] shear_direction_degt[0] shear_speed_kt[0] turbulence[0] You will notices that the dataref names contain what looks like array specifiers. These datarefs are definitely NOT arrays, they just have poorly selected names that are a historical artifact of X-Plane. I'm fairly sure the lowest weather layer is controlled by the datarefs that end in [0]. If not, try the others in the set. ([1] and [2]) Hope that helps.