Update #1: During Rev 64729 (AOS 18:29:46z), operations received multiple VIIRS YH alarms indicating S-NPP VIIRS experienced an anomaly and the instrument entered an anomalous state (single board computer lockup suspected). Engineering has started recovery steps and was able to restore the instrument into an operational state in op-day mode by 21:54z. Engineering will resume the remaining recovery steps on Thursday, April 25, 2024.

All missed S-NPP VIIRS data will not be recoverable. All VIIRS science data except day night products are valid for operational use. A future update will provide the status on when the day night bands are ready for operational use. The NOAA-21 and NOAA-20 VIIRS instruments will continue to provide all other JPSS VIIRS data needs.

All S-NPP VIIRS science and CrIS BUFR products are impacted by the ongoing issue.

Topic: NPP SMD Data Delay

Date/Time Issued: April 24, 2024 2150Z

Product(s) or Data Impacted: JPSS NPP Data Products

Date/Time of Initial Impact: April 24, 2024 1829Z

Date/Time of expected end Time: April 24, 2024 2012Z

Length of Outage : TBD

Details/Specifics of Change : Due to an instrument issue VIIRS SMD data was not received for Rev 64729 at SVL. Data should be automatically recovered on the next SVL on REV 64730.

Contact Information for Further Information: ESPC Operations at ESPCOperations@noaa.gov and 301-817-3880

Web Site(s) for applicable information: N/A

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