Highest level reached before balloon descent because of icing or turbulence 8 008040 Balloon re-ascended beyond previous highest ascent level 17 008040 Mandatory wind level 27 008040 Flight level top 37 008040 End missing wind data 44 008040 Significant temperature level (according to NCDC) 42 008040 Other 62 008040 Significant relative humidity level 18 008040 Begin missing data (all elements) 5 008040 Standard pressure level 14 008040 Zero degrees Celsius crossing(s) for RADAT 13 008040 Flight termination level 23 008040 Pressure 100 to 110 hPa, when no other reason applies 33 008040 High-resolution data sample 0 008040 End missing data (all elements) 10 008040 End doubtful temperature, height data 9 008040 Significant wind level 28 008040 Missing value 63 008040 Relative humidity level selection terminated 19 008040 Begin missing relative humidity data 6 008040 Operator-added level 15 008040 Aircraft report 25 008040 Tropopause(s) 24 008040 Freezing level base 34 008040 Wind termination level 32 008040 Level of 80-knot isotach above jet 60 008040 Surface level 20 008040 Incremental wind level (fixed regional) 30 008040 Significant thermodynamic level (inversion) 40 008040 Base pressure level for stability index 3 008040 Within 20 hPa of surface 1 008040 Flight level significance End missing relative humidity data 11 008040 1 Significant temperature level 21 008040 Begin missing temperature data 7 008040 Operator-deleted level 16 008040 Interpolated (generated) level 26 008040 Flight level base 36 008040 2014-09-03T09:54:16.038Z Freezing level top 35 008040 Begin missing wind data 43 008040 Incremental height level (generated) 31 008040 Significant relative humidity level (according to NCDC criteria) 41 008040 Level of 80-knot isotach below jet 61 008040 Begin doubtful temperature, height data 4 008040 Pressure less than 10 hPa (i.e., 9, 8, 7, etc.) when no other reason applies 2 008040 End missing temperature data 12 008040 Mandatory temperature level 22 008040 Maximum wind level 29 008040