{
 "generated_utc": "2026-07-27T11:25:00Z",
 "gfs_cycle_utc": "2026-07-27T06:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 168.0,
  "output_interval_min": 30,
  "integration_step_s": 900,
  "wind_field_interval_h": 3
 },
 "staleness": {
  "fresh_seed_max_h": 24.0,
  "served_until_h": 168.0,
  "note": "A trajectory is served for seven days after the last real fix and then the flight disappears. Past dead_reckoned flights the balloon has not been heard from since seed_time, so its present position is a prediction too -- the silent period is reconstructed from GFS analyses of weather that has already happened, which is why wind_source distinguishes analysis from forecast."
 },
 "members": {
  "offsets_m": [
   -2000,
   -1500,
   -1000,
   -500,
   0,
   500,
   1000,
   1500,
   2000
  ],
  "nominal_offset_m": 0,
  "note": "Each member is seeded at the last observed altitude plus its offset and then conserves the density it started with. The ladder is a sensitivity fan, not a probability distribution: adjacent members diverge by roughly 1,200 km over seven days. levels_spanned reports how many GFS levels the fan actually straddles, usually 2 or 3."
 },
 "files": {
  "trajectories_csv_gz": "PBA_forecast_20260727_06Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260727_06Z.geojson.gz"
 },
 "counts": {
  "flights": 34,
  "members": 9,
  "rows": 102879
 },
 "flights": [
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 18:53:40",
   "seed_lat": -54.79167,
   "seed_lon": -53.16665,
   "seed_alt_m": 12420.0,
   "seed_age_h": 16.44,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-02 18:30:00",
    "lat": -43.33626,
    "lon": -100.73893,
    "alt_m": 12324.7
   },
   "member_spread_deg": {
    "lat": 32.62,
    "lon": 121.17
   }
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-24 17:39:48",
   "seed_lat": 59.97917,
   "seed_lon": 4.08333,
   "seed_alt_m": 13000.0,
   "seed_age_h": 65.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-07-31 17:15:00",
    "lat": 68.74412,
    "lon": 129.06736,
    "alt_m": 12929.0
   },
   "member_spread_deg": {
    "lat": 13.72,
    "lon": 61.64
   }
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 10:59:18",
   "seed_lat": 45.1875,
   "seed_lon": -30.45833,
   "seed_alt_m": 12970.0,
   "seed_age_h": 0.35,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 11:00:00",
    "lat": 50.14437,
    "lon": 111.31881,
    "alt_m": 12865.3
   },
   "member_spread_deg": {
    "lat": 24.78,
    "lon": 53.82
   }
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 00:53:33",
   "seed_lat": 40.58333,
   "seed_lon": -134.70833,
   "seed_alt_m": 14020.0,
   "seed_age_h": 10.44,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-03 00:30:00",
    "lat": 31.36637,
    "lon": -39.81584,
    "alt_m": 14483.9
   },
   "member_spread_deg": {
    "lat": 33.76,
    "lon": 139.92
   }
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 04:09:00",
   "seed_lat": 52.16667,
   "seed_lon": -169.125,
   "seed_alt_m": 13020.0,
   "seed_age_h": 7.18,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 03:45:00",
    "lat": 34.73116,
    "lon": -154.24268,
    "alt_m": 12999.4
   },
   "member_spread_deg": {
    "lat": 27.07,
    "lon": 160.2
   }
  },
  {
   "callsign": "DG2GG-25",
   "flight_id": "DG2GG-25_2026-06-15",
   "payload_type": "WSPR",
   "seed_time": "2026-07-25 07:22:00",
   "seed_lat": 68.97917,
   "seed_lon": 68.16667,
   "seed_alt_m": 12990.0,
   "seed_age_h": 51.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-01 06:45:00",
    "lat": 80.99393,
    "lon": -87.83442,
    "alt_m": 12779.8
   },
   "member_spread_deg": {
    "lat": 33.47,
    "lon": 112.14
   }
  },
  {
   "callsign": "DG2GG-27",
   "flight_id": "DG2GG-27_2026-07-04",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 08:58:00",
   "seed_lat": 56.29167,
   "seed_lon": 111.625,
   "seed_alt_m": 13140.0,
   "seed_age_h": 2.37,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 08:30:00",
    "lat": 26.38258,
    "lon": -154.4388,
    "alt_m": 13693.5
   },
   "member_spread_deg": {
    "lat": 40.34,
    "lon": 94.99
   }
  },
  {
   "callsign": "DJ2DS-34",
   "flight_id": "DJ2DS-34_2026-04-22",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 01:03:30",
   "seed_lat": 51.79167,
   "seed_lon": -99.29167,
   "seed_alt_m": 12785.0,
   "seed_age_h": 10.28,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 00:30:00",
    "lat": 47.71043,
    "lon": 40.59772,
    "alt_m": 13009.6
   },
   "member_spread_deg": {
    "lat": 37.64,
    "lon": 220.56
   }
  },
  {
   "callsign": "DL0MMZ",
   "flight_id": "DL0MMZ_2026-07-24",
   "payload_type": "OTHER",
   "seed_time": "2026-07-25 15:59:04",
   "seed_lat": 36.60802,
   "seed_lon": 30.46457,
   "seed_alt_m": 8441.0,
   "seed_age_h": 43.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-01 15:30:00",
    "lat": 47.83611,
    "lon": 145.67153,
    "alt_m": 8455.9
   },
   "member_spread_deg": {
    "lat": 32.21,
    "lon": 52.46
   }
  },
  {
   "callsign": "DL0MZ-493",
   "flight_id": "DL0MZ-493_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 16:06:01",
   "seed_lat": 49.625,
   "seed_lon": 25.08333,
   "seed_alt_m": 12400.0,
   "seed_age_h": 19.23,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-02 15:30:00",
    "lat": 60.09217,
    "lon": 135.67895,
    "alt_m": 12288.2
   },
   "member_spread_deg": {
    "lat": 29.84,
    "lon": 310.51
   }
  },
  {
   "callsign": "DL0MZ-493e",
   "flight_id": "DL0MZ-493e_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 16:06:02",
   "seed_lat": 49.63134,
   "seed_lon": 25.11007,
   "seed_alt_m": 12400.0,
   "seed_age_h": 19.23,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-02 15:30:00",
    "lat": 59.99043,
    "lon": 135.66629,
    "alt_m": 12291.8
   },
   "member_spread_deg": {
    "lat": 18.64,
    "lon": 315.18
   }
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 10:53:00",
   "seed_lat": 72.29167,
   "seed_lon": -43.66667,
   "seed_alt_m": 12300.0,
   "seed_age_h": 0.45,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-03 11:00:00",
    "lat": 56.86706,
    "lon": 77.01602,
    "alt_m": 12255.2
   },
   "member_spread_deg": {
    "lat": 27.0,
    "lon": 238.11
   }
  },
  {
   "callsign": "DO3GU-40",
   "flight_id": "DO3GU-40_2026-06-19",
   "payload_type": "WSPR",
   "seed_time": "2026-07-24 12:15:47",
   "seed_lat": 71.20833,
   "seed_lon": 93.16667,
   "seed_alt_m": 15164.0,
   "seed_age_h": 71.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-07-31 11:45:00",
    "lat": 61.32781,
    "lon": 169.55748,
    "alt_m": 15012.6
   },
   "member_spread_deg": {
    "lat": 18.52,
    "lon": 349.88
   }
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 06:03:00",
   "seed_lat": 52.6875,
   "seed_lon": 26.41667,
   "seed_alt_m": 12890.0,
   "seed_age_h": 5.28,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 05:30:00",
    "lat": 58.22989,
    "lon": -144.02511,
    "alt_m": 12810.8
   },
   "member_spread_deg": {
    "lat": 16.47,
    "lon": 316.12
   }
  },
  {
   "callsign": "K0PEA-28",
   "flight_id": "K0PEA-28_2026-01-07",
   "payload_type": "WSPR",
   "seed_time": "2026-07-23 12:15:25",
   "seed_lat": 49.85411,
   "seed_lon": 24.91668,
   "seed_alt_m": 13360.0,
   "seed_age_h": 95.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-07-30 11:45:00",
    "lat": 52.94845,
    "lon": 82.59411,
    "alt_m": 13631.9
   },
   "member_spread_deg": {
    "lat": 16.75,
    "lon": 323.12
   }
  },
  {
   "callsign": "K5NOT-11",
   "flight_id": "K5NOT-11_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 22:55:37",
   "seed_lat": 52.93744,
   "seed_lon": -105.16667,
   "seed_alt_m": 12810.0,
   "seed_age_h": 12.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-02 22:30:00",
    "lat": 43.93939,
    "lon": 41.9126,
    "alt_m": 13104.9
   },
   "member_spread_deg": {
    "lat": 35.14,
    "lon": 211.54
   }
  },
  {
   "callsign": "K9YO-23",
   "flight_id": "K9YO-23_2026-07-13",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 06:25:49",
   "seed_lat": 52.5833,
   "seed_lon": 125.16663,
   "seed_alt_m": 12840.0,
   "seed_age_h": 4.9,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 06:00:00",
    "lat": 31.1155,
    "lon": 117.16938,
    "alt_m": 13072.9
   },
   "member_spread_deg": {
    "lat": 29.95,
    "lon": 294.37
   }
  },
  {
   "callsign": "KC3LBR-449",
   "flight_id": "KC3LBR-449_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 10:57:04",
   "seed_lat": 80.29167,
   "seed_lon": 62.70833,
   "seed_alt_m": 13050.0,
   "seed_age_h": 0.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 11:00:00",
    "lat": 63.39674,
    "lon": -122.71993,
    "alt_m": 13377.2
   },
   "member_spread_deg": {
    "lat": 34.58,
    "lon": 112.05
   }
  },
  {
   "callsign": "KC3LBR-485",
   "flight_id": "KC3LBR-485_2026-03-19",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 10:54:48",
   "seed_lat": 58.91667,
   "seed_lon": -3.41667,
   "seed_alt_m": 12700.0,
   "seed_age_h": 0.42,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 11:00:00",
    "lat": 54.58514,
    "lon": 69.00654,
    "alt_m": 12769.5
   },
   "member_spread_deg": {
    "lat": 21.76,
    "lon": 248.02
   }
  },
  {
   "callsign": "KC5TRB-1",
   "flight_id": "KC5TRB-1_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 10:55:43",
   "seed_lat": 52.83328,
   "seed_lon": -45.3333,
   "seed_alt_m": 13000.0,
   "seed_age_h": 0.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 11:00:00",
    "lat": 52.59917,
    "lon": 103.36361,
    "alt_m": 12920.3
   },
   "member_spread_deg": {
    "lat": 28.42,
    "lon": 121.73
   }
  },
  {
   "callsign": "KE8RES-8",
   "flight_id": "KE8RES-8_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 02:36:00",
   "seed_lat": 62.9375,
   "seed_lon": -153.5,
   "seed_alt_m": 12570.0,
   "seed_age_h": 8.73,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 02:00:00",
    "lat": 46.95164,
    "lon": -83.00172,
    "alt_m": 12498.2
   },
   "member_spread_deg": {
    "lat": 32.05,
    "lon": 139.07
   }
  },
  {
   "callsign": "KI1TEN-1",
   "flight_id": "KI1TEN-1_2026-07-23",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 23:55:27",
   "seed_lat": 32.77079,
   "seed_lon": -118.2083,
   "seed_alt_m": 12230.0,
   "seed_age_h": 11.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-02 23:30:00",
    "lat": 23.14093,
    "lon": -83.41832,
    "alt_m": 12255.0
   },
   "member_spread_deg": {
    "lat": 21.4,
    "lon": 96.18
   }
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 10:55:45",
   "seed_lat": 56.83328,
   "seed_lon": -57.79165,
   "seed_alt_m": 13570.0,
   "seed_age_h": 0.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 11:00:00",
    "lat": 69.83815,
    "lon": 117.15542,
    "alt_m": 13126.0
   },
   "member_spread_deg": {
    "lat": 27.53,
    "lon": 277.5
   }
  },
  {
   "callsign": "N0MPM-31",
   "flight_id": "N0MPM-31_2026-04-16",
   "payload_type": "WSPR",
   "seed_time": "2026-07-21 23:53:19",
   "seed_lat": -24.02088,
   "seed_lon": -135.08331,
   "seed_alt_m": 14600.0,
   "seed_age_h": 131.45,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-07-28 23:30:00",
    "lat": -18.91119,
    "lon": 11.87857,
    "alt_m": 14548.7
   },
   "member_spread_deg": {
    "lat": 29.92,
    "lon": 111.69
   }
  },
  {
   "callsign": "PC4L-11",
   "flight_id": "PC4L-11_2026-07-16",
   "payload_type": "APRS",
   "seed_time": "2026-07-26 12:46:26",
   "seed_lat": 42.93908,
   "seed_lon": 39.39383,
   "seed_alt_m": 11696.0,
   "seed_age_h": 22.56,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-02 12:15:00",
    "lat": 27.88914,
    "lon": 166.81196,
    "alt_m": 12183.9
   },
   "member_spread_deg": {
    "lat": 41.92,
    "lon": 348.08
   }
  },
  {
   "callsign": "SP0LND-6",
   "flight_id": "SP0LND-6_2026-07-25",
   "payload_type": "APRS",
   "seed_time": "2026-07-26 13:19:17",
   "seed_lat": 44.85792,
   "seed_lon": 29.04891,
   "seed_alt_m": 13803.0,
   "seed_age_h": 22.01,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-02 12:45:00",
    "lat": 60.86621,
    "lon": 161.72501,
    "alt_m": 13697.6
   },
   "member_spread_deg": {
    "lat": 27.96,
    "lon": 319.47
   }
  },
  {
   "callsign": "SP2ROC-1",
   "flight_id": "SP2ROC-1_2026-03-14",
   "payload_type": "APRS",
   "seed_time": "2026-07-22 14:00:27",
   "seed_lat": 40.10083,
   "seed_lon": 44.614,
   "seed_alt_m": 14644.0,
   "seed_age_h": 117.33,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-07-29 13:30:00",
    "lat": 24.32331,
    "lon": 69.841,
    "alt_m": 14872.2
   },
   "member_spread_deg": {
    "lat": 36.06,
    "lon": 44.79
   }
  },
  {
   "callsign": "SP2ROC-41",
   "flight_id": "SP2ROC-41_2026-01-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 10:51:00",
   "seed_lat": 49.14583,
   "seed_lon": -26.25,
   "seed_alt_m": 15800.0,
   "seed_age_h": 0.48,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-03 10:15:00",
    "lat": 70.72839,
    "lon": 104.18079,
    "alt_m": 15503.1
   },
   "member_spread_deg": {
    "lat": 21.18,
    "lon": 105.22
   }
  },
  {
   "callsign": "SP6MPL-32",
   "flight_id": "SP6MPL-32_2026-01-23",
   "payload_type": "WSPR",
   "seed_time": "2026-07-21 03:17:00",
   "seed_lat": -22.31248,
   "seed_lon": 162.875,
   "seed_alt_m": 14160.0,
   "seed_age_h": 152.05,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-07-28 02:45:00",
    "lat": -12.17528,
    "lon": -109.42322,
    "alt_m": 14347.0
   },
   "member_spread_deg": {
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    "lon": 349.96
   }
  },
  {
   "callsign": "SP6MPL-34",
   "flight_id": "SP6MPL-34_2025-12-03",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 06:57:00",
   "seed_lat": 70.5,
   "seed_lon": 159.16667,
   "seed_alt_m": 13340.0,
   "seed_age_h": 4.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 06:30:00",
    "lat": 58.03331,
    "lon": -103.37223,
    "alt_m": 13182.4
   },
   "member_spread_deg": {
    "lat": 24.62,
    "lon": 72.13
   }
  },
  {
   "callsign": "W0DLK-1",
   "flight_id": "W0DLK-1_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-07-21 06:43:47",
   "seed_lat": 46.18745,
   "seed_lon": 121.75004,
   "seed_alt_m": 12630.0,
   "seed_age_h": 148.6,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-07-28 06:15:00",
    "lat": 40.52456,
    "lon": -165.49491,
    "alt_m": 13068.5
   },
   "member_spread_deg": {
    "lat": 28.73,
    "lon": 346.13
   }
  },
  {
   "callsign": "YU9OMT-1",
   "flight_id": "YU9OMT-1_2026-05-24",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 12:50:00",
   "seed_lat": 39.60417,
   "seed_lon": 35.08336,
   "seed_alt_m": 11370.0,
   "seed_age_h": 22.5,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-02 12:15:00",
    "lat": 60.56727,
    "lon": 144.57509,
    "alt_m": 11585.3
   },
   "member_spread_deg": {
    "lat": 36.66,
    "lon": 83.48
   }
  },
  {
   "callsign": "ZS6SRC-37",
   "flight_id": "ZS6SRC-37_2026-07-15",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 10:14:00",
   "seed_lat": -22.5625,
   "seed_lon": 13.0,
   "seed_alt_m": 12220.0,
   "seed_age_h": 1.1,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-03 09:45:00",
    "lat": -20.65025,
    "lon": -61.08875,
    "alt_m": 12420.3
   },
   "member_spread_deg": {
    "lat": 13.65,
    "lon": 80.13
   }
  },
  {
   "callsign": "ZS6SRC-84",
   "flight_id": "ZS6SRC-84_2026-07-12",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 10:55:00",
   "seed_lat": -5.8125,
   "seed_lon": 6.16667,
   "seed_alt_m": 13060.0,
   "seed_age_h": 0.42,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 11:00:00",
    "lat": -20.12051,
    "lon": -155.47568,
    "alt_m": 13013.4
   },
   "member_spread_deg": {
    "lat": 14.74,
    "lon": 301.08
   }
  }
 ]
}