The UAVSonde reported the temperature at ground level was 51.6 F and the relative humidity was 19%. At 400 feet AGL, the air temperature was 49.0 F and the relative humidity was 19%. That's a lapse rate of 6.5 F per 1,000 feet.
According to the thermal imager, the ground temperature was 34 F and the clouds has a temperature of -8 F. Assuming a dry adiobatic lapse of 5.4 F per 1,000 feet, the clouds were at an altitude of 7,800 feet.
|Thermal image of the stratus over NearSys Station|
|Visible image of the same clouds|
Averaging the two estimates, the status clouds over NearSys Station have a base altitude of 7,050 feet. According to Wikipedia, straits clouds are no higher than 6,500 feet (2,000 m).