Several radiosondes were noticed to have a very stark dry layer between 150 m and 350 m,
where the RH dropped from approximately 60-80% (which I would take as close to the ambient
conditions) to less than 2%. The character of these dropouts look like instrument
issues, as it only a handful of radiosondes that appear to be affected. The quicklook images
from the Raman lidar does not show any very dry layers, thus supporting the hypothesis
that the RH measurements from these radiosondes (at least in this small ~200 m level) are
in error. I should note that the temperature profiles look normal.
I believe that these RH profiles in this altitude region are bad, and the data in
this portion of the profile should not be used; however, the rest of the profile seems
reasonable. I would recommend that users edit these profiles to remove this small
(approximately 200 m) section of the profile before their analysis.