The thermal imager indicated a temperature difference of 10 degrees F between the ground and the sky. If we assume a dry adiabatic lapse rate of 5.4 degrees per thousand feet, the cloud base was at 1,800 feet. That means the UAV reached 22% of the way to the cloud base. A moist adiabatic lapse rate of 3 degrees per thousand feet, then the cloud base was at 3,300 feet and the UAV climbed 12% of the way to the cloud base.
Based on the images, it appears that 1,800 feet is a more accurate altitude of the cloud base.
|Looking east. Nearby precip is visible in the southeast.|