| Category | QA Procedure | Items Checked | Items Deleted |
|---|---|---|---|
| Fundamental Sanity Checks | Date Check | Year, month, day, hour | Sounding |
| Release Time Check | Release time | Release time | |
| Observation Value Check | p, z, T, d, ws, wd | Individual values | |
| Duplicate Level Check | Pressure or height | Levels | |
| Station Elevation Checks | Elevation Inspection (manual) | Surface height | Surface height |
| Internal Consistency Checks | Hypsometric Check | p, z | Individual levels |
| Height Sequence Check | z | Levels | |
| Multiple Surface Levels Check | Level type indicator | Levels | |
| Surface Inspection (manual) | p, T | Level | |
| Below-surface Level Check | p, z | Level | |
| Obs Hour/Release Time Check | Obs Hour - Release Time | Sounding | |
| Zero-speed Wind Check | ws, wd | ws, wd | |
| Checks for Repetition of Values | Temporal runs check (generic) | p, z, T | Levels or values |
| Temporal runs check (by hour) | p, z, T | Levels or values | |
| Vertical runs check | T | Values |
|
| Joint vertical runs check | T | Values | |
| Frequent erroneous values check | z, T | Values | |
| Fixed Geopotential Height | z (Russian GTS only) | Values | |
| Climatological Checks | Tier 1 | p, z, T | Levels or values |
| Tier 2 | p, z, T | Levels or values | |
| Additional Checks on Temperature | Crazy Profile Check | T | T-soundings |
| Generic vertical outlier check | T | Values | |
| Vertical sore-thumb check | T | Values | |
| Temporal sore-thumb check | T | Values | |
| Data Completeness Checks | Lone dewpoint depression check | d, T | Values |
| Lone wind value check | ws, wd | Values | |
| Incomplete level check | p, z, d, T, ws, wd | Levels | |
| Surface-only sounding check | level-type indicator | Sounding | |
| Isolated sounding check | data and time | Sounding |