701
NOUS72 KNES 052004
ADMNES
UPDATE #1: CORRECTION FOR TOPIC LINE.

TOPIC: DECOMMISSIONING OF NOAA-18 SCHEDULED FOR JUNE 6, 2025 1733-1749 UTC

DATE/TIME ISSUED: JUNE 5, 2025 1950 UTC

PRODUCT(S) OR DATA IMPACTED: NOAA-18 DATA PRODUCTS

DATE/TIME OF INITIAL IMPACT: JUNE 6, 2025 1733-1749 UTC

DATE/TIME OF EXPECTED END TIME: N/A DECOMMISSIONING

DURATION: PERMANENT

DETAILS:

ON MAY 31, 2025 AT 1605 UTC, THE NOAA-18 S-BAND TRANSMITTER 4 (STX4)
EXPERIENCED A POWER DROP FROM 7W TO 0.8W. STX4 IS THE ONLY REMAINING
TRANSMITTER USED FOR UP-LINK (COMMANDING) AND DOWNLINK (TELEMETRY & GLOBAL
SCIENCE DATA FROM THE RECORDER). FULL RECOVERY OF THE S-BAND TRANSMITTER
AND ITS FUNCTIONALITY IS NOT POSSIBLE, AND THEREFORE JEOPARDIZES THE
ABILITY TO ENSURE SAFE OPERATION OF THE SPACECRAFT. BASED ON NOAA   S
REQUIREMENT TO RESPONSIBLY MANAGE ON-ORBIT ASSETS, NOAA WILL DECOMMISSION
NOAA-18 ON JUNE 6, 2025 BETWEEN 1733 AND 1749 UTC.

NOAA-18 IS A LEGACY POLAR OPERATIONAL ENVIRONMENTAL SATELLITES (POES)
SATELLITE AND IS OPERATED WITH NO PERFORMANCE OR LATENCY REQUIREMENTS.
USERS SHOULD TRANSITION TO NOAA`S JOINT POLAR SATELLITE SYSTEM (JPSS).
JPSS PROVIDES GLOBAL OBSERVATIONS THAT SERVE AS THE BACKBONE OF BOTH SHORT-
AND LONG-TERM FORECASTS, INCLUDING THOSE THAT HELP US PREDICT AND PREPARE
FOR SEVERE WEATHER EVENTS. THE FIVE SATELLITES SCHEDULED IN THE FLEET ARE
THE CURRENTLY-FLYING NOAA/NASA SUOMI NATIONAL POLAR-ORBITING PARTNERSHIP
(SUOMI NPP) SATELLITE, NOAA-20, PREVIOUSLY KNOWN AS JPSS-1, NOAA-21,
PREVIOUSLY KNOWN AS JPSS-2, AND THE UPCOMING JPSS-3 AND JPSS-4 SATELLITES.

CONTACT INFORMATION FOR FURTHER INFORMATION: PLEASE EMAIL USER SERVICES AT
SPSD.USERSERVICES@NOAA.GOV



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