National Oceanic and Atmospheric Administration, United States Department of Commerce


  • Attention JPSS Data Users! (12/2/2021):
    CLASS is now receiving reprocessed Sensor Data Records (SDR) for all instruments flown on S-NPP and reprocessed Temperature Data Records (TDR) for the ATMS instrument flown on S-NPP. The date range which covers the reprocessing period for each instrument is:
    • *ATMS SDR/TDR (2011-11-08 - 2019-10-15)
    • *CrIS SDR (2012-02-20 - 2020-01-29)
    • *OMPS SDR (2012-01-30 - 2020-05-30)
    • *VIIRS SDR (2012-01-02 - 2020-04-30)

    At an ingest rate of 3TB per/day the completion date is estimated for June 2023. The VIIRS data is the largest volume by far and will be the last to ingest. Users can download the global data files from the ftp server at ftp-jpss.avl.class.noaa.gov under the STAR subfolder. The data will remain on the server for about 85 days. Searches for regional data on the individual search pages will remain disabled until the data are 100% available. Please contact the CLASS Helpdesk for details.

  • Attention! Gap in JPSS SNPP Data. (08/05/2021):
    Beginning on August 3, 2021 @12:46 UTC, the SNPP satellite was placed into Safe Mode shortly after it lost mission pointing capability. As a result, no data was flowing from the satellite. A little after 24 hours, the ATMS, CERES, and OMPS instruments were recovered. The VIIRS instrument was recovered soon afterwards at 1600 UTC on August 4. Please note that the VIIRS instrument will undergo tuning and product quality checks for at least a couple of days. Please use the data with caution. If you have any questions, please contact the CLASS Helpdesk.

  • Attention ALL CLASS Users! (02/26/2021):
    Beginning March 3, 2021, CLASS will implement a mechanism to ensure that your orders continue to be processed in a timely fashion. In order to do this CLASS will accept up to a maximum of 25 orders per 24 hour period in order to prohibit excessive numbers of orders placed by those very few users. Also, CLASS will continue to increase the allowed file count limits on those datasets containing high daily counts of files. If you have a need to place more than 25 orders per day or have any questions, please contact CLASS Helpdesk. Thank you.

  • Attention New CLASS Users – See tutorial on accessing data from CLASS (4/12/2018):

    Please click on the following link to get step by step instructions on how to use CLASS to search and order data: https://www.avl.class.noaa.gov/notification/pdfs/CLASS%20Data%20Access%20Tutorial_042015.pdf.

    If you have any questions or need assistance please submit an email to CLASS Help Desk.