Helicopter Sounding : Determination of the vertical temperature profile based on observations of a helicopter's free-air thermometer and corresponding altimeter readings. Note: Minisonde, Rawinsonde Observations.
The Canadian Interagency Forest Fire Centre (CIFFC), Glossary of Forest Fire Management Terms, Manitoba, Canada 2003. http://bcwildfire.ca/mediaroom/Backgrounders/2003_ Fire_Glossary.pdf, (For Fr - Canad) {474}