Administrative – (Update #1) GOES-17 (GOES-West) ABI Mode 3 Cooling Timeline 2 – Hour Test Implementation March 29, 2021 Issued:  March 23, 2021 1545 UTC

Administrative Date/Time Issued:  March 23, 2021 1545 UTC

Update #1: To correct text: This is not an actual degradation period. Also, GNC-A does not supply any non CMI products

Product(s) or Data Impacted: GOES-17 ABI Imagery and Level 2 Products

Date/Time of Initial Impact: March 29, 2021 1200 UTC

Date/Time of Expected End: March 29, 2021 1400 UTC

Length of Event: 2-hours on March 29 from 1200 UTC to 1400 UTC. See details below.


Details/Specifics of Change: An out of cycle GOES-17 ABI (to support GOES-T Data Operations Exercise (DOE) -1 Testing) is scheduled to be implemented on March 29 from 1200 UTC -1400 UTC if there is no Critical Weather Day (CWD). If a CWD is declared this Cooling Timeline implementation will occur on March 31 from 1200 UTC-1400 UTC.


The timeline will operate in Mode 3 (“Flex Mode 3” uploaded as timelineID=3) where GOES-17 ABI will generate a single full disk once per 15 minutes and generate one mesoscale domain sector each minute. Alternating MESO domains will be collected one time each per two-minute period. The CONUS domain will not be scanned during the timeline as those periods will be used for cooling.

Full Disk product availability will occur every 15 minutes with timestamps of HH:00, HH:15, HH:30, and HH:45 (with HH:00 representing data collected from HH:00 through HH:15 and HH:15 representing data collected from HH:15 through HH:30, etc.) for each hour from 1200-1400 UTC.  Mesoscale domain sector availability will alternate each minute between the two mesos (e.g. HH:00 for MESO1, HH:01 for MESO2, HH:02 for MESO1, HH:03 for MESO2)GOES-17 ABI will continue its capability to handle domain sector requests during the cooling timeline period. Nominal Mode 6 operations will resume at 1400 on March 29. INR and radiometric calibration will be maintained throughout the cooling timeline periods of activation.  The data availability from each distribution service is provided below in a format of “Distribution Service: Data Availability”. 


AWIPS (Advanced Weather Interactive Processing System): 

      15-minute SCMI (Sectorized Cloud and Moisture Imagery) for Full Disk

      2-minute SCMI for mesoscale domain sector “MESO1” and “MESO2”

      15-minute SCMI for Alaska sector (subset from Full Disk)

      15-minute SCMI for Hawaii sector (subset from Full Disk)


GRB (GOES Rebroadcast): 

      15-minute L1b Radiances Full Disk

      2-minute L1b Radiances for mesoscale domain sector “MESO1” and “MESO2”


PDA (Product & Distribution Access System):

      15-minute L1b Radiances Full Disk

      2-minute L1b Radiances for mesoscale domain sector “MESO1” and “MESO2”

      15-minute Level 2 CMI Full Disk

      2-minute Level 2 CMI for mesoscale domain sector “MESO1” and “MESO2”

HRIT/EMWIN (High Resolution Information Transmission / Emergency Managers Weather Information Network):  30-minute Level 2 CMI Full Disk will be broadcast at HH:11 and HH:41.  The mesoscale domain sectors “MESO1” and “MESO2” will be broadcast. Only one MESO scene will be broadcast each 15 minutes.

GNC-A (GEONETCast-Americas):  GNC-A broadcast of 15-minute Level 2 CMI Full Disk imagery will be distributed at HH:01, HH:16, HH:31, and HH:46. 


The GOES-17 ABI Mode 3 cooling timeline implementation is planned to occur if there is no Critical Weather Day (CWD) declaration. If there is a CWD the 2-hour test cooling timeline will be implemented on March 31 from 1200 UTC-1400 UTC. These cooling timeline activities are specific to ABI.  All other GOES-17 spacecraft and instruments (EXIS, GLM, Magnetometer, SEISS, SUVI) activities will remain nominal for the duration of the ABI cooling timeline activation period.

Contact Information for Further Information: ESPC Operations at or 301-817-3880

Web Site(s) for applicable information:

See for this and other satellite related messages.

See GOES-17 ABI performance website at

See for GOES-17 ABI Cooling Timeline Scan Schedule

Users are encouraged to send an email to and to report any unexpected issues with downstream products and services.

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