IOP flights at UND the dew point temperature was high compared to the measured air temperature.

Bad calibration information in the instrument from the Spring 2004 calibration.

Send the instrument in to get recalibrated. September 2, 2004 ground check by David Delene shown that the instrument was working a lot better. Comparison with dewpoint generator shown measured dewpoint of 9.6 C when a dewpoint of 10 C was generated. September 24, 2004 Test flight in Grand Forks shown TDL dewpoint less the air temperature during cloud sampling.