Extension of Stability Exercise Outdoors

The previous exercise can be extended outdoors using a tethered balloon or, if available, a 25' or higher vertical mast. Digital Outdoor/indoor thermometers can be taped to a wire which is then held aloft by a tethered balloon as in the diagram below or taped to a mast. They should be shielded from direct sunlight. A nocturnal inversion will show up very nicely on these thermometers early in the morning. Over an asphalt parking lot in full afternoon sun, the lapse rate may be very unstable.

tether balloon with temperature sensors from hardware store