Description of changes effective September 14, 2010
The source of NAVY SST retrieval data was changed from NOAA-18 to NOAA-19.
Description of changes effective February 17, 2009
The RTG_SST analysis state was modified using NAVY SST retrieval data. This was done as part of the replacement of the 1/12 deg. resolution RTG_SST_HR analysis and was aimed at maintaining the proper generation of ice in the sea-ice analysis.
Description of changes effective September 23, 2008
The source of NAVY SST retrieval data was changed from NOAA-17 to NOAA-18.
The filling of latitudes 88 N - 90 N with -1.8 deg. C was removed.
Description of changes effective May 6, 2004
The source of NAVY SST retrieval data was changed from NOAA-16 to NOAA-17.
Description of changes effective May 8, 2002
Array sizes for one week of in situ data were doubled from 90,000 to 180,000
in the program which performs quality control of in situ data.
The program in question was generating large numbers of messages indicating
that buoy data were being dropped. This was due to insufficient array sizes.
The effect was that up to 25% of buoy data were being dropped from the the most
recent day's worth of data (i.e., the real-time buoy data). The buoys dropped
were in the northern areas (off of Western Europe, the U. S. and Canadian East
Coast, the Gulf of Alaska and the West Coast off the U. S. and Canada).
The northernmost buoys started being lost around April 22.
Description of changes effective April 23, 2002
Instituted a smoother to eliminate 2-delta grid length waves, while leaving
larger scale phenomena unchanged.
The reason for making this change is that small-scale noise in the RTG_SST analysis
was growing noticeably with time. There was very little noise as of Febrary
2001, but it was increasing throughout the past year. The growth of the
noise has been attributed to the growth of round-off error in the RTG_SST analysis.
Description of changes effective October 23, 2001
Change in the operational run-time from 2045 UTC to 2240 UTC; and change the
window for admitting data to the analysis system, in order to ingest all SST
data received up to analysis run-time.
The reasons for making these changes are: to synchronize the daily RTG_SST
run-time with the 00 UTC EDAS and produce more timely SST fields for use by the
00 UTC Meso Eta model run. The previous operational run-time was 3 hours, 15
minutes before the 00 UTC EDAS, and most recent data in the previous operational
RTG_SST was already 20 hours old.
Description of changes effective June 5, 2001
Switch from NOAA-14 MUT SST retrievals to NOAA-16 SEATEMP SST retrievals.
The reasons for making this change are: (1) switch to a high-resolution,
higher quality SST retrieval from the Navy; (2) switch from the older
satellite (NOAA-14) to the newer satellite (NOAA-16).
For additional information about data-management and analysis techniques, contact
For information about the run cycle and digital data format, contact