{
 "generated_utc": "2026-08-05T23:27:33Z",
 "gfs_cycle_utc": "2026-08-05T18:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 485.5,
  "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_20260805_18Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260805_18Z.geojson.gz"
 },
 "counts": {
  "flights": 36,
  "members": 9,
  "rows": 182061
 },
 "flights": [
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 16:48:40",
   "seed_lat": -42.02084,
   "seed_lon": -12.83332,
   "seed_alt_m": 12780.0,
   "seed_age_h": 6.52,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 17:45:00",
    "lat": -33.49533,
    "lon": -130.46084,
    "alt_m": 12831.5
   },
   "member_spread_deg": {
    "lat": 23.24,
    "lon": 340.32
   },
   "member_spread_now_deg": {
    "lat": 2.29,
    "lon": 0.69
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 293.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 17:45:00",
    "lat": 61.41789,
    "lon": -128.60606,
    "alt_m": 13070.1
   },
   "member_spread_deg": {
    "lat": 24.68,
    "lon": 269.8
   },
   "member_spread_now_deg": {
    "lat": 55.98,
    "lon": 348.92
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 22:45:18",
   "seed_lat": 67.20833,
   "seed_lon": -126.0,
   "seed_alt_m": 12920.0,
   "seed_age_h": 0.58,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 22:15:00",
    "lat": 61.75897,
    "lon": 12.8435,
    "alt_m": 12927.3
   },
   "member_spread_deg": {
    "lat": 18.92,
    "lon": 184.22
   },
   "member_spread_now_deg": {
    "lat": 0.37,
    "lon": 0.17
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 17:48:48",
   "seed_lat": 52.4375,
   "seed_lon": 9.41667,
   "seed_alt_m": 14020.0,
   "seed_age_h": 5.52,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-12 17:45:00",
    "lat": 56.74254,
    "lon": 154.16252,
    "alt_m": 14137.9
   },
   "member_spread_deg": {
    "lat": 31.49,
    "lon": 46.92
   },
   "member_spread_now_deg": {
    "lat": 1.8,
    "lon": 3.17
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 22:31:30",
   "seed_lat": 32.08333,
   "seed_lon": -153.45833,
   "seed_alt_m": 13100.0,
   "seed_age_h": 0.81,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 22:00:00",
    "lat": 28.01605,
    "lon": -143.36262,
    "alt_m": 13016.8
   },
   "member_spread_deg": {
    "lat": 5.69,
    "lon": 16.53
   },
   "member_spread_now_deg": {
    "lat": 0.09,
    "lon": 0.2
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 279.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 17:45:00",
    "lat": 71.4164,
    "lon": 42.52016,
    "alt_m": 12501.3
   },
   "member_spread_deg": {
    "lat": 34.41,
    "lon": 234.61
   },
   "member_spread_now_deg": {
    "lat": 38.75,
    "lon": 203.81
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DG2GG-27",
   "flight_id": "DG2GG-27_2026-07-04",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 22:48:00",
   "seed_lat": 47.77083,
   "seed_lon": -121.04167,
   "seed_alt_m": 13660.0,
   "seed_age_h": 0.53,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 22:15:00",
    "lat": 23.09286,
    "lon": -119.75197,
    "alt_m": 13971.2
   },
   "member_spread_deg": {
    "lat": 32.0,
    "lon": 56.76
   },
   "member_spread_now_deg": {
    "lat": 0.04,
    "lon": 0.33
   },
   "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": 42.38,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 17:30:00",
    "lat": 34.9274,
    "lon": -133.31494,
    "alt_m": 13500.3
   },
   "member_spread_deg": {
    "lat": 57.61,
    "lon": 271.17
   },
   "member_spread_now_deg": {
    "lat": 11.75,
    "lon": 11.56
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 200.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-12 17:45:00",
    "lat": 34.56838,
    "lon": 44.37581,
    "alt_m": 9140.1
   },
   "member_spread_deg": {
    "lat": 57.99,
    "lon": 301.92
   },
   "member_spread_now_deg": {
    "lat": 47.04,
    "lon": 127.88
   },
   "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": 271.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-12 17:30:00",
    "lat": 46.66704,
    "lon": 2.08721,
    "alt_m": 8748.5
   },
   "member_spread_deg": {
    "lat": 39.32,
    "lon": 345.46
   },
   "member_spread_now_deg": {
    "lat": 43.33,
    "lon": 356.46
   },
   "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": 183.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-12 17:30:00",
    "lat": 65.99368,
    "lon": 6.80297,
    "alt_m": 12323.9
   },
   "member_spread_deg": {
    "lat": 38.86,
    "lon": 317.25
   },
   "member_spread_now_deg": {
    "lat": 34.79,
    "lon": 77.96
   },
   "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": 183.88,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-12 17:30:00",
    "lat": 35.72482,
    "lon": -14.36866,
    "alt_m": 12674.8
   },
   "member_spread_deg": {
    "lat": 28.47,
    "lon": 169.92
   },
   "member_spread_now_deg": {
    "lat": 38.55,
    "lon": 46.74
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 22:53:00",
   "seed_lat": 80.54167,
   "seed_lon": -177.08333,
   "seed_alt_m": 11930.0,
   "seed_age_h": 0.45,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-12 23:00:00",
    "lat": 63.3694,
    "lon": 112.50197,
    "alt_m": 12078.4
   },
   "member_spread_deg": {
    "lat": 20.5,
    "lon": 216.92
   },
   "member_spread_now_deg": {
    "lat": 0.43,
    "lon": 0.34
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 299.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 17:45:00",
    "lat": 62.68544,
    "lon": -115.80536,
    "alt_m": 15158.2
   },
   "member_spread_deg": {
    "lat": 31.79,
    "lon": 346.77
   },
   "member_spread_now_deg": {
    "lat": 19.24,
    "lon": 326.02
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 22:25:30",
   "seed_lat": 66.02083,
   "seed_lon": -130.83333,
   "seed_alt_m": 13210.0,
   "seed_age_h": 0.91,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 22:00:00",
    "lat": 72.42835,
    "lon": -140.939,
    "alt_m": 12796.9
   },
   "member_spread_deg": {
    "lat": 12.02,
    "lon": 238.09
   },
   "member_spread_now_deg": {
    "lat": 0.48,
    "lon": 0.65
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 323.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 17:45:00",
    "lat": 55.06884,
    "lon": -52.07218,
    "alt_m": 13487.7
   },
   "member_spread_deg": {
    "lat": 80.54,
    "lon": 277.72
   },
   "member_spread_now_deg": {
    "lat": 55.86,
    "lon": 352.02
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "K5NOT-11",
   "flight_id": "K5NOT-11_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 10:35:37",
   "seed_lat": 44.91661,
   "seed_lon": 79.375,
   "seed_alt_m": 12870.0,
   "seed_age_h": 12.74,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 17:30:00",
    "lat": 42.9719,
    "lon": -147.34049,
    "alt_m": 13211.8
   },
   "member_spread_deg": {
    "lat": 67.72,
    "lon": 336.63
   },
   "member_spread_now_deg": {
    "lat": 2.61,
    "lon": 4.8
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 232.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 17:30:00",
    "lat": 23.28881,
    "lon": -140.42126,
    "alt_m": 13132.2
   },
   "member_spread_deg": {
    "lat": 74.2,
    "lon": 305.62
   },
   "member_spread_now_deg": {
    "lat": 68.48,
    "lon": 294.6
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC3LBR-449",
   "flight_id": "KC3LBR-449_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 22:57:03",
   "seed_lat": 49.14583,
   "seed_lon": -91.70833,
   "seed_alt_m": 13420.0,
   "seed_age_h": 0.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 23:00:00",
    "lat": 55.12623,
    "lon": 29.66117,
    "alt_m": 13554.9
   },
   "member_spread_deg": {
    "lat": 13.86,
    "lon": 126.7
   },
   "member_spread_now_deg": {
    "lat": 0.16,
    "lon": 0.21
   },
   "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": 206.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 17:45:00",
    "lat": 46.37361,
    "lon": -157.59205,
    "alt_m": 12835.1
   },
   "member_spread_deg": {
    "lat": 41.44,
    "lon": 357.35
   },
   "member_spread_now_deg": {
    "lat": 24.8,
    "lon": 286.42
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC5TRB-1",
   "flight_id": "KC5TRB-1_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-02 11:30:43",
   "seed_lat": 67.33328,
   "seed_lon": 65.58336,
   "seed_alt_m": 12840.0,
   "seed_age_h": 83.82,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 17:30:00",
    "lat": 57.02155,
    "lon": 26.03477,
    "alt_m": 12783.6
   },
   "member_spread_deg": {
    "lat": 52.43,
    "lon": 338.64
   },
   "member_spread_now_deg": {
    "lat": 34.0,
    "lon": 345.33
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KD7FXO-1",
   "flight_id": "KD7FXO-1_2026-08-02",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 22:35:00",
   "seed_lat": 45.22917,
   "seed_lon": -108.79167,
   "seed_alt_m": 12800.0,
   "seed_age_h": 0.75,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 22:00:00",
    "lat": 47.4055,
    "lon": 41.94335,
    "alt_m": 12702.4
   },
   "member_spread_deg": {
    "lat": 24.68,
    "lon": 89.81
   },
   "member_spread_now_deg": {
    "lat": 0.13,
    "lon": 0.22
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KE8RES-8",
   "flight_id": "KE8RES-8_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 22:36:00",
   "seed_lat": 58.35417,
   "seed_lon": -82.95833,
   "seed_alt_m": 12000.0,
   "seed_age_h": 0.73,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-12 22:00:00",
    "lat": 48.9417,
    "lon": -87.70721,
    "alt_m": 12075.1
   },
   "member_spread_deg": {
    "lat": 8.76,
    "lon": 44.94
   },
   "member_spread_now_deg": {
    "lat": 0.1,
    "lon": 0.12
   },
   "display_as": "track",
   "display_reason": "fresh"
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  },
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  },
  {
   "callsign": "KI6DS-11",
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   "payload_type": "WSPR",
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  },
  {
   "callsign": "PC4L-11",
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   "seed_time": "2026-07-26 12:46:26",
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   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "SP0LND-6",
   "flight_id": "SP0LND-6_2026-07-25",
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   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
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   "flight_id": "SP2ROC-41_2026-01-25",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 10:01:00",
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  },
  {
   "callsign": "SP6MPL-34",
   "flight_id": "SP6MPL-34_2025-12-03",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 18:52:00",
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   "display_as": "region",
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  },
  {
   "callsign": "SP6MPL-9",
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   "display_as": "track",
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  },
  {
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  },
  {
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  },
  {
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  },
  {
   "callsign": "ZS6SRC-37",
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   "payload_type": "WSPR",
   "seed_time": "2026-07-31 04:34:00",
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  },
  {
   "callsign": "ZS6SRC-84",
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   "payload_type": "WSPR",
   "seed_time": "2026-07-27 15:20:00",
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  }
 ]
}