Estimated Altitude of Clouds Above NearSys Station, 4 May 2018

The Seek Reveal thermal imager indicated the ground temperature had a temperature of 52 deg and the cirrus clouds overhead had a temperature of -18 deg. That's a difference of 70 deg.

The weather station indicates the air temperature is 77 deg and the dew point is 45 deg. That's a difference of 32 deg.

Assuming a dry adiabatic lapse rate of 5.4 deg per 1,000 feet, the overhead cirrus clouds are at an altitude of 13,000 and 5,900 feet respectively.

I am going to assume the thermal imager is the better value. By the way, the temperature of the cloud-free sky is on the order of -30 to -35 degrees.

Thermal image of the overhead cirrus clouds

Visible image ofthe cirrus clouds overhead