Topic: GOES-17 (GOES-West) ABI Mode 3 Cooling Timeline Implementation

Date/Time Issued:  July 20, 2020 1850 UTC

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

Date/Time of Initial Impact: August 11, 2020 0600 UTC

Date/Time of Expected End: September 01, 2020 1200 UTC

Length of Event: 6-hours each day from 0600 UTC to 1200 UTC and lasting from August 11, 2020 through September 01, 2020.  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 next upcoming implementation starts on Tuesday August 11, 2020 and lasts through Tuesday, September 01, 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 next full period in 2020 is given below with subsequent periods for 2021 to be confirmed based on future GOES-17 ABI thermal models:


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 August 11, 2020  through September 01, 2020.  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):  


GRB (GOES Rebroadcast):  


PDA (Product & Distribution Access System):

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.  All Level 2 non-CMI products will not be broadcast during the defined cooling timeline period.


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 instrument (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.

This message was sent to You have been sent this and other notifications because you have opted in to receive it. If for any reason, you wish to unsubscribe, please contact ESPC Help Desk at or (301) 817-3880. Please note: it may take up to two business days to process your unsubscribe request.