Quick Facts
- Type
- Atmospheric Phenomenon
- Definition
- A column of rising warm air generated by uneven surface heating
- Used By
- Pilots
Definition#
A thermal is a column or bubble of rising air produced by differential surface heating. Darker surfaces (parking lots, plowed fields) heat air more than surrounding areas, creating localized updrafts.
Why It Matters Operationally#
Thermals are the primary lift source for glider and sailplane operations. For powered aircraft, thermals cause convective turbulence, especially in the afternoon over land. Strong thermals can develop into cumulus and eventually cumulonimbus clouds.
Related Guides#
- What Is Turbulence?
- Air Masses & Fronts in Aviation
- Aviation Weather Explained — The Complete Operational Guide