Skew-T Plots - Upper Air SoundingsMon Oct 30, 2000 3:43 am
As a tool to evaluate the atmospheric environment in which trails (normal or not) are observed, people should look at Upper Air Soundings for their geographical area.
These will provide, authentic, irrefutable, measured data which will provide an OBJECTIVE, SCIENTIFIC basis for evaluating whether aircraft trails should be persistent or not.
The Unisys Weather site has information about Skew-T plots: