This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.
Hello! Thanks for reaching out to us, and apologies for the delayed response. This has occurred because NCEI has very slightly changed their THREDDS Data Server URL structure for model output, and I need to go through to find and update these occurrences in our training material. If you update the base URL from '../grid/gfs-g4-anl-files/' to '../model-gfs-g4-anl-files/', you should be back in business. So, your `base_url` should now be 'https://www.ncei.noaa.gov/thredds/ncss/model-gfs-g4-anl-files/', and if this doesn't work don't hesitate to follow up and let me know. Hope this helps! All the best, Drew > I was wondering why I keep getting trace back errors when trying to pull data > with a URL. here is an example I used from the unidata website. > [cid:af46cad2-e683-410b-8e7d-7b8efd464a77] > > Ticket Details =================== Ticket ID: CPI-447832 Department: Support Python Priority: Low Status: Closed =================== NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.