Dictionary
Aviation Dictionary
Thermal index (TI)
Definitions
- For any given level is the temperature of the air parcel having risen at the dry adiabatic lapse rate (DALR) subtracted from the ambient temperature. Experience has shown that a TI should be –2 for thermals to form and be sufficiently strong for soaring flight.
References
-
Glider Flying Handbook by Federal Aviation Administration (2024)
