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.

The time TBD for the Date/Time of Initial impact is 14:48:20 UTC. The time TBD for the Date/Time of Expected End is 16:46:54 UTC. Length of Outage is about 119 minutes.

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

Date/Time Issued: October 21, 2025 1355Z

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

Date/Time of Initial Impact: October 22, 2025 TBD (14:48:20 UTC)

Date/Time of Expected End: October 22, 2025 TBD (16:46:54 UTC)

Length of Outage: 1 Rev (about 115 minutes) (about 119 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.

Contact for further information: ESPC Operations at ESPCOperations@noaa.gov or 301-817-3880 24x7 or goes-r.product.engineering.group@noaa.gov during normal business hours

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