There was quote from quote along time back in this topic from WeatherFlow about the sonic sensors requiring a little time to “settle in” once a SKY module has be installed. I wonder if the same is true for Tempest?
Once installed at a specific location (“in-situ”), the AIR and SKY devices will go through a range of calibration routines. The routines for the sonic anemometer for example actively evaluate the sine / cosine curves and frequencies to ensure the sensors are capturing the right sonic wavelengths and nothing has been jarred during shipping. If amiss, your SKY will recalibrate and capture corrections in the onboard firmware (the sonics are so sensitive that a change in gap height or angle the size of a human hair can throw things off).