Dear NWP centers: To update our previous email regarding the instrument software update to Sentinel-6 A (Michael Freilich), the upload will begin around 08:30 UTC on January 30, 2025 and end around 11:30 UTC on February 5, 2025. Note that the end may be extended if needed. While we are anticipating very brief outages once per day of up to 30 minutes, please be advised that there could be longer outages if, e.g., quality issues manifest. After the software upload is completed, the Sentinel-6 A BUFR products will not be distributed on GTS for 7-10 days. After this brief checkout period to confirm there is no impact to product performance, the GPS and GLONASS BUFR products will be back online while the performance of the Galileo products continues to be assessed. A separate announcement will follow when the GPS and GLONASS BUFR products are back online and another when the Galileo BUFR products become available on GTS. Sincerely, Chad Galley, on behalf of the S6 RO Team from JPL and EUMETSAT