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.