Topic: GOES-16 ABI EOPP Navigation Update scheduled for April 27, 2018
Date/Time Issued: April 25, 2018 1335 UTC
Product(s) or Data Impacted: GOES-16 ABI EOPP Navigation Update
Date/Time of Initial Impact: April 27, 2018 1915 UTC
Date/Time of Expected End: April 27, 2018 1930 UTC
Length of Outage: Approximately 15 minutes of degraded products

Details/Specifics of Change:
On Friday, April 27, 2018 at 1918 UTC the GOES-16 routine weekly upload of Earth Orientation Parameter Predictions (EOPP) will be modified to correct for a processing discrepancy onboard the spacecraft. Imagery acquired during this time (Full Disk, CONUS, and MESOs) will be affected in the following way:
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There will be a slight change in navigation (<10 microradians or 400 meters) in the EW direction within 2 minutes of the upload. After verifying successful EOPP upload to GOES-16, the ABI lookup table (LUT) changes necessary to remove the EW bias from the ground processing will occur. By the start of the GOES-16 ABI Mode 3 timeline at 1930 UTC both the spacecraft and ground processing should be synchronized for proper ABI image navigation.
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If there is a Critical Weather Day declared on Friday then the GOES-16 modified EOPP load will be postponed.
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Contact Information for Further Information: ESPC Operations at ESPCOperations@noaa.gov or 301-817-3880
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Web Site(s) for applicable information:
See http://www.ssd.noaa.gov/PS/SATS/messages.html for this and other satellite related messages.

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