The FILNET adjustment is much worse than it seems.
USHCN is losing station data a phenomenal rate since 1990, and they are filling in the missing data with temperatures higher than the station data which is not missing. The rationale for this would have to be that the missing station data was from stations which were warmer than average.
I put that to the test by comparing 1943-1989 data for stations which have missing 1990-2013 data, versus those with complete 1990-2013 station data. It turns out that the stations losing data are actually colder than the ones with complete records. So the FILNET adjustment is creating warming, when it should be creating cooling.
The big question is – is NOAA intentionally dropping colder station data, so that they can fill in fake warm data?