A technical change was implemented at ECMWF in the operational production on Tuesday 11 November 2014, in order to allow active assimilation of observations received in BUFR format.

The observation types affected are SYNOP,SHIP, TEMP, TEMP SHIP, PILOT LAND, PILOT SHIP and AMDAR.

Most of the data are still under monitoring and will be actively assimilated only if the equivalent TAC data are missing or if they are deemed to improve the forecast performance.
At the moment ECMWF is actively assimilating the following data received in BUFR

The most significant improvement provided at the moment from the NWP point of view is definitely due to the high-resolution radiosonde data and to highlight the importance of this milestone,  reached after so many years of work on the TAC to BUFR migration, ECMWF has prepared a the following page summarising the quality of the new high resolution data as compared to the traditional TEMP: Statistics of High resolution BUFR TEMP.