Update #2: The NOAA-20 ATMS EEPROM data write activity has been completed successfully. ATMS was transitioned to an operational state at 16:37:46 UTC.

Update #1: The NOAA-20 ATMS EEPROM data write activity scheduled for October 22, 2025 will be executed as scheduled. Expected times for initial impact and expected end have been updated, for an expected product unavailability of about 118 minutes

Topic: NOAA-20 ATMS planned outage due to Electrically Erasable Programmable Read-Only Memory (EEPROM) data write activity.

Date/Time Issued: October 22, 2025 1653Z

Product(s) or Data Impacted: NOAA-20 ATMS Products

Date/Time of Initial Impact: October 22, 2025, time TBD

Date/Time of Expected End: October 22, 2025, time TBD

Length of Outage: 1 Rev (about 115 minutes)

Details/Specifics: All NOAA-20 ATMS data and its derived products will not be available while the EEPROM write activity is being executed. This planned outage is necessary to verify load success before returning ATMS to operational. An update will be sent out closer to the activity date in order to provide accurate outage times.

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