Topic:M-B ATOVS Radiosonde Matchup Anomaly

Date/Time Issued:M-B January 06, 2020 2035 UTC

Product(s) or Data Impacted:M-B ATOVS Sounding Data Products

Date/Time of Initial Impact:M-B December 17, 2019 1200 UTC

Date/Time of Expected End: M-BJanuary 07, 2020

Length of Event: N/A



Details/Specifics of Change: On Dec. 17, 2019, NOAA/NCEP/NCO made a change to their Global Data Assimilation (GDAS) files.M-B There were three nonstandard levels (600 mb, 40 mb, 15 mb) that were added. This caused the ATOVS program that does radiosonde matchups to fail to read these files.M-B As a result the ATOVS system did not input any new radiosonde matchup data since December 18, 2019, with resulting degradation of sounding data. A fix has been tested and planned to be implemented into operations on Jan. 7, 2020.


Contact Information for Further Information:

Product Area Lead - Awdhesh Sharma (

Web Site(s) for applicable information:


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