{
 "generated_utc": "2026-07-27T05:24:47Z",
 "gfs_cycle_utc": "2026-07-27T00:00:00Z",
 "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_00Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260727_00Z.geojson.gz"
 },
 "counts": {
  "flights": 35,
  "members": 9,
  "rows": 105858
 },
 "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": 10.44,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-02 18:30:00",
    "lat": -43.86571,
    "lon": -94.78398,
    "alt_m": 12357.2
   },
   "member_spread_deg": {
    "lat": 42.46,
    "lon": 96.1
   }
  },
  {
   "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": 59.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-07-31 17:15:00",
    "lat": 68.44607,
    "lon": 162.30276,
    "alt_m": 12879.1
   },
   "member_spread_deg": {
    "lat": 22.28,
    "lon": 75.91
   }
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 18:51:19",
   "seed_lat": 45.72917,
   "seed_lon": -35.83333,
   "seed_alt_m": 13110.0,
   "seed_age_h": 10.48,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-02 18:15:00",
    "lat": 49.33139,
    "lon": 112.00469,
    "alt_m": 12961.3
   },
   "member_spread_deg": {
    "lat": 19.91,
    "lon": 41.82
   }
  },
  {
   "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": 4.44,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-03 00:30:00",
    "lat": 33.27879,
    "lon": -45.72496,
    "alt_m": 14512.4
   },
   "member_spread_deg": {
    "lat": 32.58,
    "lon": 139.37
   }
  },
  {
   "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": 1.18,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 03:45:00",
    "lat": 33.11833,
    "lon": -94.60649,
    "alt_m": 13071.8
   },
   "member_spread_deg": {
    "lat": 27.36,
    "lon": 131.48
   }
  },
  {
   "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": 45.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-01 06:45:00",
    "lat": 80.63241,
    "lon": -101.02105,
    "alt_m": 12677.3
   },
   "member_spread_deg": {
    "lat": 34.86,
    "lon": 108.08
   }
  },
  {
   "callsign": "DG2GG-27",
   "flight_id": "DG2GG-27_2026-07-04",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 11:28:00",
   "seed_lat": 49.54167,
   "seed_lon": 89.875,
   "seed_alt_m": 13040.0,
   "seed_age_h": 17.87,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-02 11:00:00",
    "lat": 33.20355,
    "lon": 169.86835,
    "alt_m": 13760.1
   },
   "member_spread_deg": {
    "lat": 23.4,
    "lon": 355.9
   }
  },
  {
   "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": 4.28,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 00:30:00",
    "lat": 47.88012,
    "lon": 41.15062,
    "alt_m": 12985.6
   },
   "member_spread_deg": {
    "lat": 39.9,
    "lon": 171.82
   }
  },
  {
   "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": 37.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-01 15:30:00",
    "lat": 46.02663,
    "lon": 141.83338,
    "alt_m": 8487.2
   },
   "member_spread_deg": {
    "lat": 27.91,
    "lon": 64.66
   }
  },
  {
   "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": 13.23,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-02 15:30:00",
    "lat": 58.69862,
    "lon": 156.04879,
    "alt_m": 12251.3
   },
   "member_spread_deg": {
    "lat": 8.19,
    "lon": 338.39
   }
  },
  {
   "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": 13.23,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-02 15:30:00",
    "lat": 58.64186,
    "lon": 155.25005,
    "alt_m": 12296.8
   },
   "member_spread_deg": {
    "lat": 25.5,
    "lon": 337.14
   }
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 22:43:00",
   "seed_lat": 77.60417,
   "seed_lon": -59.33333,
   "seed_alt_m": 12150.0,
   "seed_age_h": 6.62,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-02 22:15:00",
    "lat": 50.84445,
    "lon": 71.49378,
    "alt_m": 12096.0
   },
   "member_spread_deg": {
    "lat": 26.92,
    "lon": 130.46
   }
  },
  {
   "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": 65.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-07-31 11:45:00",
    "lat": 60.77662,
    "lon": 165.50532,
    "alt_m": 15080.4
   },
   "member_spread_deg": {
    "lat": 21.26,
    "lon": 341.89
   }
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 16:10:30",
   "seed_lat": 50.375,
   "seed_lon": 19.75,
   "seed_alt_m": 13020.0,
   "seed_age_h": 13.16,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-02 15:45:00",
    "lat": 66.01192,
    "lon": -155.21747,
    "alt_m": 12860.7
   },
   "member_spread_deg": {
    "lat": 28.46,
    "lon": 341.03
   }
  },
  {
   "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": 89.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-07-30 11:45:00",
    "lat": 54.34662,
    "lon": 81.98825,
    "alt_m": 13615.6
   },
   "member_spread_deg": {
    "lat": 14.33,
    "lon": 316.9
   }
  },
  {
   "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": 6.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-02 22:30:00",
    "lat": 47.75938,
    "lon": 42.85041,
    "alt_m": 13067.4
   },
   "member_spread_deg": {
    "lat": 34.34,
    "lon": 176.31
   }
  },
  {
   "callsign": "K9YO-23",
   "flight_id": "K9YO-23_2026-07-13",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 04:55:49",
   "seed_lat": 52.9583,
   "seed_lon": 123.7083,
   "seed_alt_m": 12810.0,
   "seed_age_h": 0.4,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 05:00:00",
    "lat": 34.13582,
    "lon": 114.69563,
    "alt_m": 13039.1
   },
   "member_spread_deg": {
    "lat": 65.75,
    "lon": 290.65
   }
  },
  {
   "callsign": "KC3LBR-449",
   "flight_id": "KC3LBR-449_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 04:57:03",
   "seed_lat": 79.33333,
   "seed_lon": 46.70833,
   "seed_alt_m": 13100.0,
   "seed_age_h": 0.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 05:00:00",
    "lat": 60.31168,
    "lon": -83.18576,
    "alt_m": 13292.5
   },
   "member_spread_deg": {
    "lat": 30.74,
    "lon": 60.91
   }
  },
  {
   "callsign": "KC3LBR-485",
   "flight_id": "KC3LBR-485_2026-03-19",
   "payload_type": "WSPR",
   "seed_time": "2026-07-23 17:57:03",
   "seed_lat": 54.97917,
   "seed_lon": -79.79167,
   "seed_alt_m": 12610.0,
   "seed_age_h": 83.38,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-07-30 17:30:00",
    "lat": 53.78402,
    "lon": 45.95488,
    "alt_m": 12690.9
   },
   "member_spread_deg": {
    "lat": 29.91,
    "lon": 123.36
   }
  },
  {
   "callsign": "KC5TRB-1",
   "flight_id": "KC5TRB-1_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 20:15:43",
   "seed_lat": 57.89578,
   "seed_lon": -51.79163,
   "seed_alt_m": 13030.0,
   "seed_age_h": 9.07,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-02 19:45:00",
    "lat": 55.84981,
    "lon": 74.79981,
    "alt_m": 12815.4
   },
   "member_spread_deg": {
    "lat": 31.42,
    "lon": 144.95
   }
  },
  {
   "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": 2.73,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 02:00:00",
    "lat": 55.74663,
    "lon": -133.99161,
    "alt_m": 12454.4
   },
   "member_spread_deg": {
    "lat": 27.8,
    "lon": 152.26
   }
  },
  {
   "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": 5.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-02 23:30:00",
    "lat": 41.04057,
    "lon": -118.52744,
    "alt_m": 12232.1
   },
   "member_spread_deg": {
    "lat": 14.85,
    "lon": 98.15
   }
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 22:35:45",
   "seed_lat": 53.31245,
   "seed_lon": -64.41665,
   "seed_alt_m": 13540.0,
   "seed_age_h": 6.74,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-02 22:00:00",
    "lat": 67.54084,
    "lon": 100.23959,
    "alt_m": 13417.3
   },
   "member_spread_deg": {
    "lat": 12.2,
    "lon": 105.4
   }
  },
  {
   "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": 125.45,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-07-28 23:30:00",
    "lat": -18.84529,
    "lon": 12.8238,
    "alt_m": 14529.8
   },
   "member_spread_deg": {
    "lat": 30.01,
    "lon": 106.34
   }
  },
  {
   "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": 16.56,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-02 12:15:00",
    "lat": 45.674,
    "lon": 122.68446,
    "alt_m": 12130.6
   },
   "member_spread_deg": {
    "lat": 44.5,
    "lon": 356.1
   }
  },
  {
   "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": 16.01,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-02 12:45:00",
    "lat": 75.15123,
    "lon": -160.33665,
    "alt_m": 13238.4
   },
   "member_spread_deg": {
    "lat": 20.15,
    "lon": 337.05
   }
  },
  {
   "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": 111.33,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-07-29 13:30:00",
    "lat": 28.55241,
    "lon": 66.7501,
    "alt_m": 14875.9
   },
   "member_spread_deg": {
    "lat": 27.88,
    "lon": 42.86
   }
  },
  {
   "callsign": "SP2ROC-41",
   "flight_id": "SP2ROC-41_2026-01-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 18:58:00",
   "seed_lat": 47.08333,
   "seed_lon": -33.20833,
   "seed_alt_m": 15770.0,
   "seed_age_h": 10.37,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-02 18:30:00",
    "lat": 69.26772,
    "lon": 97.7305,
    "alt_m": 15404.1
   },
   "member_spread_deg": {
    "lat": 16.24,
    "lon": 100.05
   }
  },
  {
   "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": 146.05,
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   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-07-28 02:45:00",
    "lat": -12.3575,
    "lon": -109.91225,
    "alt_m": 14348.9
   },
   "member_spread_deg": {
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    "lon": 349.74
   }
  },
  {
   "callsign": "SP6MPL-34",
   "flight_id": "SP6MPL-34_2025-12-03",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 04:22:00",
   "seed_lat": 70.875,
   "seed_lon": 155.66667,
   "seed_alt_m": 13340.0,
   "seed_age_h": 0.97,
   "float_reliable": true,
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   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 03:45:00",
    "lat": 55.59252,
    "lon": -102.41812,
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   },
   "member_spread_deg": {
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    "lon": 78.96
   }
  },
  {
   "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,
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   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-07-28 06:15:00",
    "lat": 40.22943,
    "lon": -165.81843,
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   "member_spread_deg": {
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    "lon": 346.14
   }
  },
  {
   "callsign": "W0RBO-12",
   "flight_id": "W0RBO-12_2026-05-02",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 08:05:23",
   "seed_lat": 52.89578,
   "seed_lon": 127.75003,
   "seed_alt_m": 13570.0,
   "seed_age_h": 21.24,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-02 07:30:00",
    "lat": 52.11139,
    "lon": -117.20007,
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   },
   "member_spread_deg": {
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    "lon": 339.95
   }
  },
  {
   "callsign": "YU9OMT-1",
   "flight_id": "YU9OMT-1_2026-05-24",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 12:50:00",
   "seed_lat": 39.60416,
   "seed_lon": 35.08336,
   "seed_alt_m": 11370.0,
   "seed_age_h": 16.5,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-02 12:15:00",
    "lat": 57.28625,
    "lon": 117.5758,
    "alt_m": 11609.9
   },
   "member_spread_deg": {
    "lat": 26.45,
    "lon": 83.47
   }
  },
  {
   "callsign": "ZS6SRC-37",
   "flight_id": "ZS6SRC-37_2026-07-15",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 15:49:00",
   "seed_lat": -25.52083,
   "seed_lon": -1.45833,
   "seed_alt_m": 12320.0,
   "seed_age_h": 13.52,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-02 15:15:00",
    "lat": -28.65433,
    "lon": -87.96114,
    "alt_m": 12413.8
   },
   "member_spread_deg": {
    "lat": 10.51,
    "lon": 317.01
   }
  },
  {
   "callsign": "ZS6SRC-84",
   "flight_id": "ZS6SRC-84_2026-07-12",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 16:15:00",
   "seed_lat": -1.45833,
   "seed_lon": -0.875,
   "seed_alt_m": 12980.0,
   "seed_age_h": 13.08,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-02 15:45:00",
    "lat": -24.09301,
    "lon": 164.87471,
    "alt_m": 12743.1
   },
   "member_spread_deg": {
    "lat": 23.76,
    "lon": 318.49
   }
  }
 ]
}