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NOUS72 KNES 252004

ADMNES

UPDATE #2: ENGINEERING WAS ABLE TO SUCCESSFULLY EXECUTE ALL PLANNED

ACTIVITIES TO RECOVER THE S-NPP VIIRS INSTRUMENT BY 16:29:22Z ON THURSDAY,

APRIL 25, 2024. ALL S-NPP VIIRS PRODUCTS ARE NOW AVAILABLE FOR OPERATIONAL

USE.



DAY/NIGHT BAND (DNB) PRODUCTS MAY EXPERIENCE MINIMAL STRIPING ON SCAN EDGES

UNTIL THE NEXT NEW MOON ON MAY 8, 2024.



THIS WILL BE THE FINAL UPDATE FOR THIS EVENT.





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 25,  2024 1952Z



*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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