ICDC TDS Catalog https://icdc.cen.uni-hamburg.de/thredds/catalog/ftpthredds/fesstval/radiosonde/level1/catalog.html

Dataset Size Last Modified
     Folder  level1   --
         Folder  fval_uhh/   --
         Folder  fval_uzk/   --
         Folder  sups_rao/   --

ICDC TDS at Integrated Climate Data Center (ICDC) / University of Hamburg see Info
Documentation