Radiosonde descent data September-November 2019

Radiosonde descent data in BUFR format as received at ECMWF in near real time. The data is stored in files containing 6-hour windows centred on the synoptic times and then combined into monthly 'tar' files. In 2019 the dropsonde BUFR sequence 3 09 053 (WMO 2019) was being used as an interim measure. At ECMWF a pre-processor was used to convert to the new "descent" sequence 3 09 056 and it is these converted reports that have been made available. The main disadvantage of the dropsonde sequence was that the only identifier allowed was an aircraft identifier - this was set to missing by the MW41 software (newer reports generated directly in 3 09 056 have the WIGOS station identifier). The radiosonde ascent data in BUFR format are available from https://www.ncei.noaa.gov/pub/data/igra/v1/related/BUFR/ecmwf/data/.