ICON is in process of approving the Hough Mode product, the first Level 4 product, available for most of 2020. This product comes in 2 parts; 1) a set of diurnal and semidiurnal tidal amplitudes in a sliding 30-day window for 2020 centered on the day of interest, and 2) a TIEGCM lower boundary specification for the same date.

Update: These files are now all available on the public ftp site

Documentation for each of these components (1, 2) of the product are also available on the FTP site.