Topic: Visible calibration update for month of December 2025 

Date/Time Issued:  December 9, 2025 1902Z

Product(s) or Data Impacted:  All products from channels 1, 2, and 3a

Date/Time of Initial Impact: December 9, 2025 1200Z

Date/Time of Expected End: Until Next Month's Coefficient Update 

Length of Outage: N/A

Details/Specifics: On 9 December 2025 at approximately 12:00 UTC, the following update of the calibration coefficients was implemented in the level 1B processing for MetOp-B/1, and MetOp-C/3 for the month of December. These coefficients are intended to be optimal on December 27, in the middle of the two scheduled updates.

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