DSS presents a global synoptic set of 12 hourly upper air data
reports. These were operationally collected by NMC. They include
radiosondes, pibals and aircraft reports received via the Global
Telecommunications System (GTS). NMC used Automated Data Processing
(ADP) to decode and reformat the GTS reports. This data was the
primary input (known as "B 3s") for NMC's modeling and forecasting.
It was also a major input for the NCEP/NCAR and ECMWF Reanalysis
Projects. The NCAR document TN404 An Introduction to Atmospheric
and Oceanographic Datasets, (chapter 3)
discusses the collection of this data in greater detail.
The ADPUPA data includes land and ship launched radiosondes and
pibals. Data may be available at up to 20 mandatory levels from
1000mb to 10mb, plus a few significant levels. The AIRCFT data
includes flight level reports from commercial, military and
reconnaissance sources. The data may include pressure, deviation
value (deviation from standard atmosphere geopotential height),
temperature, dew point, wind direction and speed.
This dataset is in an NCAR blocked version of the NMC Office Note
20 (ON20) format, which involves using the DSS RPTOUT software.