240
NOUS72 KNES 291949
ADMNES
UPDATE #2: ENGINEERING COMPLETED NOAA-21 VIIRS RECOVERY EFFORTS AT 18:20:50
UTC ON JULY 29, 2026. THE NOAA-21 VIIRS RADIANCE CLUSTER AND CRIS BUFR HAVE
RETURNED TO NORMAL. NOAA 21 ACSPO SST WILL RECOVER SOMETIME LATER.
EXPECTED END TIME IS UPDATED BELOW.
UPDATE #1: ENGINEERING WILL START NOAA-21 VIIRS RECOVERY OPERATIONS JULY 29
AT 16:36 UTC TO RESOLVE THE ISSUE, WHICH IS ERRONEOUSLY FLAGGING GOOD
NOAA-21 VIIRS M14-M16 AND I5 LONG WAVE INFRARED (LWIR) DATA FOR POOR
QUALITY. THE PROCEDURE MAY TAKE A FEW CONTACTS, WITH THE EXPECTED
COMPLETION AT 20:10 UTC ON JULY 29. USERS MAY EXPERIENCE NOAA-21 VIIRS
SCIENCE DATA OUTAGE DURING THE TIME. ANY MISSED DATA DURING THIS RECOVERY
PERIOD IS EXPECTED TO BE UNRECOVERABLE. EXPECTED END TIME ADDED BELOW.
TOPIC: NOAA-21 ACSPO SST AND VIIRS RADIANCE CLUSTER NO RETRIEVALS

DATE/TIME ISSUED: JULY 29, 2026  1947Z


PRODUCT(S) OR DATA IMPACTED: NOAA-21 ACSPO SST, VIIRS RADIANCE CLUSTER, AND
CRIS SDR BUFR


DATE/TIME OF INITIAL IMPACT: JULY 28, 2026 0542Z


DATE/TIME OF EXPECTED END:  JULY 29, 2026 1820Z

LENGTH OF OUTAGE:   36 HOURS 38 MINS

DETAILS/SPECIFICS: STARTING 0542Z ON JULY 28, NOAA-21 ACSPO SST AND VIIRS
RADIANCE CLUSTER PRODUCED PRODUCTS WITHOUT MEANINGFUL RETRIEVALS. THE VIIRS
RADIANCE CLUSTER WITHIN NOAA-21 CRIS SDR BUFR ARE ALL FILL VALUES. THIS
ISSUE IMPACTED THE SAME PRODUCTS ON COMMUNITY SATELLITE PROCESSING PACKAGE
(CSPP). INVESTIGATION IS ONGOING.

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