{
 "generated_utc": "2026-08-08T11:27:25Z",
 "gfs_cycle_utc": "2026-08-08T06:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 493.5,
  "output_interval_min": 30,
  "integration_step_s": 900,
  "wind_field_interval_h": 3
 },
 "staleness": {
  "fresh_seed_max_h": 24.0,
  "served_until_h": 336.0,
  "track_max_age_h": 72.0,
  "region_spread_deg": 60.0,
  "note": "A trajectory is served for 336 h after the last real fix and then the flight disappears. That matches the archive's own bridging limit: 23% of flights go quiet for over a week and are then heard again, so a shorter window drops balloons that are still flying. 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. Use display_as, not seed_age_h, to decide how to draw a flight: 'track' means the members still agree and a line is meaningful, 'region' means draw the member envelope instead because the nominal member is no better than any other."
 },
 "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_20260808_06Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260808_06Z.geojson.gz"
 },
 "counts": {
  "flights": 31,
  "members": 9,
  "rows": 161748
 },
 "flights": [
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 06:43:40",
   "seed_lat": -56.79167,
   "seed_lon": 124.33334,
   "seed_alt_m": 12300.0,
   "seed_age_h": 4.61,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-15 06:15:00",
    "lat": -65.71078,
    "lon": 49.56544,
    "alt_m": 12527.7
   },
   "member_spread_deg": {
    "lat": 25.35,
    "lon": 48.04
   },
   "member_spread_now_deg": {
    "lat": 0.94,
    "lon": 1.83
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 10:15:18",
   "seed_lat": 55.10417,
   "seed_lon": -69.375,
   "seed_alt_m": 12850.0,
   "seed_age_h": 1.08,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 09:45:00",
    "lat": 54.77075,
    "lon": 69.31881,
    "alt_m": 12679.3
   },
   "member_spread_deg": {
    "lat": 18.61,
    "lon": 52.83
   },
   "member_spread_now_deg": {
    "lat": 0.16,
    "lon": 0.59
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 10:39:49",
   "seed_lat": 43.125,
   "seed_lon": 58.66667,
   "seed_alt_m": 14040.0,
   "seed_age_h": 0.67,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-15 10:15:00",
    "lat": 34.62336,
    "lon": 167.3466,
    "alt_m": 14160.9
   },
   "member_spread_deg": {
    "lat": 19.91,
    "lon": 319.97
   },
   "member_spread_now_deg": {
    "lat": 0.13,
    "lon": 0.11
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-08-07 23:49:00",
   "seed_lat": 51.29167,
   "seed_lon": -122.04167,
   "seed_alt_m": 12740.0,
   "seed_age_h": 11.52,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 05:45:00",
    "lat": 24.79463,
    "lon": -73.0859,
    "alt_m": 13086.3
   },
   "member_spread_deg": {
    "lat": 39.95,
    "lon": 110.27
   },
   "member_spread_now_deg": {
    "lat": 4.22,
    "lon": 10.41
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-27",
   "flight_id": "DG2GG-27_2026-07-04",
   "payload_type": "WSPR",
   "seed_time": "2026-08-07 22:48:00",
   "seed_lat": 29.25,
   "seed_lon": -101.54167,
   "seed_alt_m": 13860.0,
   "seed_age_h": 12.53,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 05:45:00",
    "lat": 15.79305,
    "lon": -104.84537,
    "alt_m": 13980.2
   },
   "member_spread_deg": {
    "lat": 37.9,
    "lon": 43.86
   },
   "member_spread_now_deg": {
    "lat": 4.2,
    "lon": 2.52
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-29",
   "flight_id": "DG2GG-29_2026-07-28",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 04:57:00",
   "seed_lat": 46.91667,
   "seed_lon": 165.25,
   "seed_alt_m": 13380.0,
   "seed_age_h": 102.38,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 05:30:00",
    "lat": 39.68338,
    "lon": -26.08893,
    "alt_m": 13657.0
   },
   "member_spread_deg": {
    "lat": 61.15,
    "lon": 244.93
   },
   "member_spread_now_deg": {
    "lat": 44.54,
    "lon": 336.85
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DJ2DS-34",
   "flight_id": "DJ2DS-34_2026-04-22",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 14:41:00",
   "seed_lat": 30.70833,
   "seed_lon": -70.5,
   "seed_alt_m": 9190.0,
   "seed_age_h": 260.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-15 05:45:00",
    "lat": 43.21327,
    "lon": 115.31933,
    "alt_m": 9106.5
   },
   "member_spread_deg": {
    "lat": 39.14,
    "lon": 309.04
   },
   "member_spread_now_deg": {
    "lat": 19.08,
    "lon": 136.08
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "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": 331.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-15 05:30:00",
    "lat": 54.94707,
    "lon": 31.34971,
    "alt_m": 8713.0
   },
   "member_spread_deg": {
    "lat": 49.98,
    "lon": 348.99
   },
   "member_spread_now_deg": {
    "lat": 50.59,
    "lon": 343.14
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DL0MZ-493",
   "flight_id": "DL0MZ-493_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 07:36:01",
   "seed_lat": 64.20833,
   "seed_lon": 58.16667,
   "seed_alt_m": 12170.0,
   "seed_age_h": 243.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-15 05:30:00",
    "lat": 52.80118,
    "lon": 49.65557,
    "alt_m": 12021.2
   },
   "member_spread_deg": {
    "lat": 34.2,
    "lon": 260.39
   },
   "member_spread_now_deg": {
    "lat": 57.78,
    "lon": 170.37
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DL0MZ-493e",
   "flight_id": "DL0MZ-493e_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 07:27:02",
   "seed_lat": 64.15625,
   "seed_lon": 58.08889,
   "seed_alt_m": 12170.0,
   "seed_age_h": 243.88,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-15 05:30:00",
    "lat": 33.03585,
    "lon": -60.86602,
    "alt_m": 12837.6
   },
   "member_spread_deg": {
    "lat": 53.37,
    "lon": 200.18
   },
   "member_spread_now_deg": {
    "lat": 49.39,
    "lon": 100.55
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 10:45:30",
   "seed_lat": 63.41667,
   "seed_lon": -46.70833,
   "seed_alt_m": 12340.0,
   "seed_age_h": 0.58,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-15 10:15:00",
    "lat": 75.43501,
    "lon": 91.28605,
    "alt_m": 12560.0
   },
   "member_spread_deg": {
    "lat": 27.56,
    "lon": 89.33
   },
   "member_spread_now_deg": {
    "lat": 0.05,
    "lon": 0.15
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 01:23:00",
   "seed_lat": 66.16667,
   "seed_lon": -130.79167,
   "seed_alt_m": 12920.0,
   "seed_age_h": 9.95,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 05:30:00",
    "lat": 68.73732,
    "lon": -98.66405,
    "alt_m": 12534.6
   },
   "member_spread_deg": {
    "lat": 33.03,
    "lon": 130.02
   },
   "member_spread_now_deg": {
    "lat": 1.2,
    "lon": 2.78
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "K5NOT-11",
   "flight_id": "K5NOT-11_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-07 01:55:37",
   "seed_lat": 46.16661,
   "seed_lon": 129.125,
   "seed_alt_m": 13010.0,
   "seed_age_h": 33.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 05:30:00",
    "lat": 15.07345,
    "lon": -173.79188,
    "alt_m": 13514.5
   },
   "member_spread_deg": {
    "lat": 40.59,
    "lon": 358.07
   },
   "member_spread_now_deg": {
    "lat": 12.19,
    "lon": 358.46
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "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": 292.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 05:30:00",
    "lat": 34.52873,
    "lon": -138.26144,
    "alt_m": 13165.3
   },
   "member_spread_deg": {
    "lat": 50.89,
    "lon": 324.64
   },
   "member_spread_now_deg": {
    "lat": 72.46,
    "lon": 261.81
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC3LBR-449",
   "flight_id": "KC3LBR-449_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 10:57:03",
   "seed_lat": 58.70833,
   "seed_lon": -55.0,
   "seed_alt_m": 13380.0,
   "seed_age_h": 0.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 11:00:00",
    "lat": 46.72328,
    "lon": 61.42708,
    "alt_m": 13542.8
   },
   "member_spread_deg": {
    "lat": 33.19,
    "lon": 86.47
   },
   "member_spread_now_deg": {
    "lat": 0.07,
    "lon": 0.14
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KC3LBR-485",
   "flight_id": "KC3LBR-485_2026-03-19",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 09:08:18",
   "seed_lat": 50.14583,
   "seed_lon": 23.375,
   "seed_alt_m": 12850.0,
   "seed_age_h": 266.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 05:45:00",
    "lat": 43.98967,
    "lon": -74.87399,
    "alt_m": 13025.1
   },
   "member_spread_deg": {
    "lat": 50.85,
    "lon": 323.57
   },
   "member_spread_now_deg": {
    "lat": 20.67,
    "lon": 304.13
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC5TRB-1",
   "flight_id": "KC5TRB-1_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-07 16:15:43",
   "seed_lat": 78.12495,
   "seed_lon": -23.5833,
   "seed_alt_m": 12540.0,
   "seed_age_h": 19.07,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 05:45:00",
    "lat": 70.25226,
    "lon": 23.67358,
    "alt_m": 12224.0
   },
   "member_spread_deg": {
    "lat": 28.21,
    "lon": 117.08
   },
   "member_spread_now_deg": {
    "lat": 5.56,
    "lon": 9.01
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KD7FXO-1",
   "flight_id": "KD7FXO-1_2026-08-02",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 10:50:00",
   "seed_lat": 37.77083,
   "seed_lon": -46.08333,
   "seed_alt_m": 12990.0,
   "seed_age_h": 0.5,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 10:15:00",
    "lat": 41.20837,
    "lon": 31.05295,
    "alt_m": 12771.3
   },
   "member_spread_deg": {
    "lat": 14.27,
    "lon": 78.99
   },
   "member_spread_now_deg": {
    "lat": 0.16,
    "lon": 0.16
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KE8RES-8",
   "flight_id": "KE8RES-8_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-07 23:21:00",
   "seed_lat": 64.91667,
   "seed_lon": -91.33333,
   "seed_alt_m": 12140.0,
   "seed_age_h": 11.98,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-15 05:45:00",
    "lat": 58.06387,
    "lon": -57.02352,
    "alt_m": 12293.8
   },
   "member_spread_deg": {
    "lat": 15.85,
    "lon": 62.0
   },
   "member_spread_now_deg": {
    "lat": 1.07,
    "lon": 1.98
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KE9DAB-11",
   "flight_id": "KE9DAB-11_2026-07-29",
   "payload_type": "WSPR",
   "seed_time": "2026-08-07 11:06:00",
   "seed_lat": 45.60417,
   "seed_lon": 28.54167,
   "seed_alt_m": 12090.0,
   "seed_age_h": 24.23,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-15 05:30:00",
    "lat": 42.07323,
    "lon": 149.33537,
    "alt_m": 12499.5
   },
   "member_spread_deg": {
    "lat": 14.61,
    "lon": 345.83
   },
   "member_spread_now_deg": {
    "lat": 8.39,
    "lon": 21.58
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KI1TEN-1",
   "flight_id": "KI1TEN-1_2026-07-23",
   "payload_type": "WSPR",
   "seed_time": "2026-08-01 22:55:27",
   "seed_lat": 23.95828,
   "seed_lon": -104.12496,
   "seed_alt_m": 12380.0,
   "seed_age_h": 156.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-15 05:30:00",
    "lat": 6.60033,
    "lon": -98.0188,
    "alt_m": 12391.6
   },
   "member_spread_deg": {
    "lat": 25.28,
    "lon": 77.07
   },
   "member_spread_now_deg": {
    "lat": 15.88,
    "lon": 9.17
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 10:45:45",
   "seed_lat": 62.64578,
   "seed_lon": -40.45831,
   "seed_alt_m": 13240.0,
   "seed_age_h": 0.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 10:15:00",
    "lat": 72.75093,
    "lon": 91.96142,
    "alt_m": 13509.3
   },
   "member_spread_deg": {
    "lat": 23.28,
    "lon": 97.01
   },
   "member_spread_now_deg": {
    "lat": 0.19,
    "lon": 0.2
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 310.56,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-15 05:45:00",
    "lat": 40.512,
    "lon": -84.69661,
    "alt_m": 12199.7
   },
   "member_spread_deg": {
    "lat": 59.72,
    "lon": 356.32
   },
   "member_spread_now_deg": {
    "lat": 56.55,
    "lon": 335.63
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "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": 310.01,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 05:45:00",
    "lat": 70.0978,
    "lon": -36.72305,
    "alt_m": 13277.1
   },
   "member_spread_deg": {
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    "lon": 274.87
   },
   "member_spread_now_deg": {
    "lat": 37.22,
    "lon": 255.42
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "SP2ROC-41",
   "flight_id": "SP2ROC-41_2026-01-25",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 06:48:00",
   "seed_lat": 63.0,
   "seed_lon": 153.125,
   "seed_alt_m": 15660.0,
   "seed_age_h": 4.53,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 06:15:00",
    "lat": 15.00439,
    "lon": 166.93874,
    "alt_m": 16576.6
   },
   "member_spread_deg": {
    "lat": 66.64,
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   },
   "member_spread_now_deg": {
    "lat": 0.35,
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   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "SP6MPL-34",
   "flight_id": "SP6MPL-34_2025-12-03",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 18:52:00",
   "seed_lat": 74.5625,
   "seed_lon": -160.0,
   "seed_alt_m": 12890.0,
   "seed_age_h": 184.47,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 05:45:00",
    "lat": 59.98112,
    "lon": -120.87618,
    "alt_m": 13223.8
   },
   "member_spread_deg": {
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   "member_spread_now_deg": {
    "lat": 27.79,
    "lon": 314.85
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "SP6MPL-9",
   "flight_id": "SP6MPL-9_2026-08-02",
   "payload_type": "APRS",
   "seed_time": "2026-08-04 04:05:45",
   "seed_lat": 45.52942,
   "seed_lon": 75.286,
   "seed_alt_m": 12836.0,
   "seed_age_h": 103.24,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 05:30:00",
    "lat": 51.8218,
    "lon": 16.80478,
    "alt_m": 13024.3
   },
   "member_spread_deg": {
    "lat": 24.08,
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   },
   "member_spread_now_deg": {
    "lat": 27.01,
    "lon": 357.72
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "VE3VRO-36",
   "flight_id": "VE3VRO-36_2026-07-30",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 04:11:00",
   "seed_lat": 42.47917,
   "seed_lon": 63.20833,
   "seed_alt_m": 13050.0,
   "seed_age_h": 7.15,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 05:45:00",
    "lat": 25.36519,
    "lon": -146.8449,
    "alt_m": 13592.9
   },
   "member_spread_deg": {
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   "member_spread_now_deg": {
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   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 310.5,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 05:45:00",
    "lat": 57.57433,
    "lon": 17.23878,
    "alt_m": 11433.7
   },
   "member_spread_deg": {
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   },
   "member_spread_now_deg": {
    "lat": 65.25,
    "lon": 308.24
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   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "ZS6SRC-37",
   "flight_id": "ZS6SRC-37_2026-07-15",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 04:34:00",
   "seed_lat": -23.70833,
   "seed_lon": 149.29167,
   "seed_alt_m": 12380.0,
   "seed_age_h": 198.77,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-15 05:30:00",
    "lat": 2.48899,
    "lon": 32.25486,
    "alt_m": 12638.0
   },
   "member_spread_deg": {
    "lat": 40.51,
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   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "ZS6SRC-84",
   "flight_id": "ZS6SRC-84_2026-07-12",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 15:20:00",
   "seed_lat": -7.75,
   "seed_lon": 8.375,
   "seed_alt_m": 13090.0,
   "seed_age_h": 284.0,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 05:45:00",
    "lat": -9.98982,
    "lon": -24.72864,
    "alt_m": 13159.2
   },
   "member_spread_deg": {
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   },
   "member_spread_now_deg": {
    "lat": 27.27,
    "lon": 251.56
   },
   "display_as": "region",
   "display_reason": "member_spread"
  }
 ]
}