• Identifier: 99 – Indicator for data on position follows
• Identifier: L_aL_aL_a – Latitude in tenths of degrees

• Identifier: Q_c – The octant of the globe
• Identifier: L_oL_oL_oL_o – Longitude in tenths of degrees

MARSDEN SQUARE: MMMU_laU_lo

• Identifier and explain: MMM – Marsden square
• Identifier and explain: U_laU_lo – Units digits in the reported latitude and longitude

• Identifier: 99 – Indicator for data at the surface level follows
• Identifier: P_oP_oP_o – Indicator for pressure of specified levels in whole millibar (thousands digit omitted)
• Identifier: T_oT_oT_o – Tens and digits of air temperature (not rounded off) in degrees Celsius, at specified levels beginning with surface
• Identifier: D_oD_o – Dewpoint depression at standard isobaric surfaces beginning with surface level

• Identifier: d_od_o – True direction from which the wind is blowing rounded to nearest 5 degrees. Report hundreds and tens digits. The unit (0 and 5) is added to the hundreds digit of wind.
• Identifier: f_of_of_o – Wind speed in knots. Hundreds digit is sum of hundreds digit of speed and unit digit of direction. Example: 295 degrees at 125 knots is encoded as 29625

• Identifier: P₁P₁ – Pressure of standard isobaric surfaces in units of tens of millibars. (1000mbs = 00, 925mbs = 92, 850mbs = 85, 700mbs = 70, 500mbs = 50, 400mbs = 40, 300mbs = 30, 250mbs = 25)
• Identifier: h₁h₁h₁ – Heights of the standard pressure level in geopotential meters or decameters above the surface. Encoded in decameters at and above 500mbs omitting, if necessary, the thousands or tens of thousands digits. Add 500 to hhh for negative 1000mb or 925mb heights. Report 1000mb group as 00/// ///// ///// when pressure is less than 950mbs.
• Identifier: T₁T₁T₁D₁D₁ – Same temperature/dew point encoding procedures apply to all levels
• Identifier: d₁d₁f₁f₁f₁ – Same wind encoding procedures apply to all levels

• Identifier: 88 – Indicator for Tropopause level follows
• Identifier: P_nP_nP_n – Pressure at the tropopause level reported in whole millibars. Report 88P_nP_nP_n as 88999 when tropopause is not observed
• Identifier: T_nT_nT_nD_nD_n – Same temperature/dew point encoding procedures apply
• Identifier: d_nd_nf_nf_nf_n - Same wind encoding procedures apply

• Identifier: 77 – Indicator that data for maximum wind level and for vertical wind shear follow when max wind does not coincide at flight. If the maximum wind level coincides with flight level encode as 66
• Identifier: P_nP_nP_n – Pressure at maximum wind level in whole millibars
• Identifier: d_nd_nf_nf_nf_n – Same wind encoding procedures apply
• Identifier: 4 – Data for vertical wind shear follow
• Identifier: v_bv_b – Absolute value of vector difference between max wind and wind 3000 feet BELOW the level of max wind, reported to the nearest knot. Use "//" if missing and a 4 is reported. A vector difference of 99 knots or more is reported with the code figure "99".
• Identifier: v_av_a – Absolute value of vector difference between max wind and wind 3000 feet ABOVE the level of max wind, reported to the nearest knot. Use "//" if missing and a 4 is reported. A vector difference of 99 knots or more is reported with the code figure "99".

• Identifier: 61616 – Aircraft and mission identification data follows
• Identifier: AFXXX – The identifier AF for U.S. Air Force and the last three digits of the aircraft’s tail number
• Identifier: XXXXX XXXXX – The identifier for the type of mission being flown.

1. If a training mission the mission identifier is WXWXA TRAIN. The fifth letter "A" is the only character that could possibly change. The "A" defining that the flight is in the Atlantic basin. The letter "C" identifies the Central Pacific area and the letter "E" identifies the Eastern Pacific.
2. If an operational storm mission: the first two numbers Identifies the number of times an aircraft has flown this system and the second two numbers identifies the system number. The last character again identifies the basin flown. The name of the storm would replace TRAIN. EXAMPLE: AF968 0204A BONNIE – Aircraft 50968, this was the second flight into this system and the system was the fourth of the season. The system reached tropical storm strength and was named BONNIE.

• Identifier: OB 04 – The observation (both vertical and horizontal) number as transmitted from the aircraft.

• Identifier: 62626 – This is the remarks section. Only the remarks: EYE EYEWALL XXX (eyewall will be followed by the radian to the eye center procured from the ARWO), or RAINBAND, if release was made in a feeder band. The splash location will be recorded automatically by computer. Followed by last wind height in meters and the mean boundary layer wind with degrees to the nearest five-degree and knots.

PART BRAVO (B)

• XXBB – Identifier for a temp drop code

• Identifier: 99 – Indicator for data on position follows
• Identifier: L_aL_aL_a – Latitude in tenths of degrees

• Identifier: Q_c – The octant of the globe
• Identifier: L_oL_oL_oL_o – Longitude in tenths of degrees

MARSDEN SQUARE: MMMU_laU_lo

• Identifier and explain: MMM – Marsden square
• Identifier and explain: U_laU_lo – Units digits in the reported latitude and longitude

• Identifier: 00 – Indicator for data at the surface level follows
• Identifier: P_oP_oP_o – Indicator for pressure of specified levels in whole millibars (thousands digit omitted)
• Identifier: T_oT_oT_o – Tens and digits of air temperature (not rounded off) in degrees Celsius, at specified levels beginning with surface
• Identifier: D_oD_o – Dewpoint depression at standard isobaric surfaces beginning with surface level

• Identifier: n_on_o – Number of level starting with surface level. Only surface will be numbered as "00". When a standard level is also selected as significant, repeat the level.
• Identifier: P_oP_oP_o – Pressure at specified levels in whole millibars.
• Identifier: T_oT_oT_oD_oD_o – Same temperature/dew point encoding applies.

• Identifier: s_rr_ar_as_as_a – Sounding system indicator, radiosonde/system status
• Identifier: s_r – Solar and infrared radiation correction ( 0 – no correction)
• Identifier: r_ar_a – Radiosonde/sounding system used (96 – Descending radiosonde)
• Identifier: s_as_a – Tracking technique/status of system used (08 – Automatic satellite navigation)
• Identifier: 8GGgg – Launch time
• Identifier: 8 – Indicator group
• Identifier: GG – Time in hours
• Identifier: gg – Time in minutes

• Identifier: 51515 – Additional data in regional code follow
• Identifier: 10166 – Geopotential data are doubtful between the following levels 0P_nP_nP_nP_n. This code figure is used only when geopotential data are doubtful from one level to another.
• Identifier: 10167 – Temperature data are doubtful between the following levels 0P_nP_nP_nP_n. This code figure shall be reported when only the temperature data are doubtful for a portion of the descent. If a 10167 group is reported a 10166 will also be reported. EXAMPLE: Temperature is doubtful from 540mbs to 510mbs. SLP is 1020mbs. The additional data groups would be : 51515 10166 00251 10167 05451
• Identifier: 10190 – Extrapolated altitude data follows:

1. When the sounding begins within 25mbs below a standard surface, the height of the surface is reported in the format 10190 P_nP_nh_nh_nh_n. The temperature group is not reported. EXAMPLE: Assume the release was made from 310mbs and the 300mb height was 966 decameters. The last reported standard level in Part A is the 400mb level. The data for the 300mb level is reported in Part A and B as 10190 30966
2. When the sounding does not reach surface, but terminates within 25mbs of a standard surface, the height of the standard surface is reported in Part A of the code in standard format and also at the end of Part A and Part B of the code in the format as 10190 P_nP_nh_nh_nh_n. EXAMPLE: Assume termination occurred as 980mbs and the extrapolated height of the 1000mb level was 115 meters. The 1000mb level would be reported in Part A of the code as 00115 ///// ///// and in Part B as 10190 0015.

• Identifier: 10191 – Extrapolated surface pressure preceds. Extrapolated surface pressure is only reported when the termination occurs between 850mbs and the surface. Surface pressure is reported in Part A as 99P_oP_oP_o ///// and in Part B as 00P_oP_oP_o /////. When surface pressure is extrapolated the 10191 group is the last additional data group reported in Part B.

61616, 62626 – Same procedures as Part A