Administrative: Update #2 - GOES-17 (GOES-West) ABI Mode 3 Cooling Timeline Implementation April 8, 2021 – May 4, 2021, Issued:  April 13, 2021 1830 UTC

Update #2: This is a correction to the "Length of Event" section to correct the end date in that section to May 4. 

Update #1: This is a reminder that the GOES-17 (GOES-West) ABI Mode 3 Cooling Timeline Implementation begins tomorrow, April 8, 2021 at 0600 UTC.

Date/Time Issued:  April 7, 2021 1330 UTC

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

Date/Time of Initial Impact: April 8, 2021 0600 UTC

Date/Time of Expected End: May 4, 2021 1200 UTC

Length of Event: 6-hours each day from 0600 UTC to 1200 UTC and lasting from April 8, 2021 through May 4, 2021. The same timeline will occur seasonally in operations for four periods each year.  See details below.


Details/Specifics of Change: GOES-17 ABI is going to commence seasonal operational implementation of the Mode 3 Cooling Timeline. The first implementation of the seasonal Mode 3 Cooling Timeline was from February 26, 2020 through March 01, 2020. The second implementation of the seasonal Mode 3 Cooling Timeline was from April 09, 2020 through May 01, 2020. The third implementation of seasonal Cooling Timeline was from August 11, 2020 to September 1, 2020. The last implementation of the seasonal Cooling Timeline was October 14, 2020 - October 31, 2020. The cooling timeline is implemented to mitigate the number of saturated images resulting from the loop heat pipe (LHP) temperature regulation anomaly. The timeline will occur for 6 hours, centered on spacecraft midnight from 0600 UTC to 1200 UTC each day. The same timeline will occur seasonally in operations for four periods each year.  The subsequent periods for 2021 have been confirmed based on the new GOES-17 ABI thermal models:

      Dates for 2021 have been shared via email and on the GOES-R website (links at end of this notification). 


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 0600-1200 UTC on April 8, 2021  through May 4, 2021.  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 1200 UTC on each day of cooling timeline operations.  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”

      All other Level 2 (non-CMI) Full Disk and mesoscale domain sector “MESO1” and “MESO2” products will be produced but may have varied degradation for the duration of the cooling timeline and up to 30 minutes *after* nominal Mode 6 resumes.

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.  Level 2 non-CMI products will be broadcast during the defined cooling timeline period, but may have varied degradation for the duration of the cooling timeline

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 despite Critical Weather Day declaration. 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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