{
 "generated_utc": "2026-09-26T05:27:51Z",
 "gfs_cycle_utc": "2026-09-26T00:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 497.5,
  "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_20260926_00Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260926_00Z.geojson.gz"
 },
 "counts": {
  "flights": 48,
  "members": 9,
  "rows": 215613
 },
 "flights": [
  {
   "callsign": "AE4ZZ-22",
   "flight_id": "AE4ZZ-22_2026-09-19",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 15:38:41",
   "seed_lat": 44.43746,
   "seed_lon": -30.29163,
   "seed_alt_m": 13470.0,
   "seed_age_h": 61.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 23:45:00",
    "lat": 48.13288,
    "lon": 178.71957,
    "alt_m": 13027.6
   },
   "member_spread_deg": {
    "lat": 23.06,
    "lon": 356.35
   },
   "member_spread_now_deg": {
    "lat": 42.79,
    "lon": 35.69
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AE4ZZ-23",
   "flight_id": "AE4ZZ-23_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 14:53:20",
   "seed_lat": 48.02081,
   "seed_lon": 10.87504,
   "seed_alt_m": 13390.0,
   "seed_age_h": 14.45,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 23:30:00",
    "lat": 46.76384,
    "lon": 179.64374,
    "alt_m": 13051.7
   },
   "member_spread_deg": {
    "lat": 11.44,
    "lon": 356.53
   },
   "member_spread_now_deg": {
    "lat": 4.63,
    "lon": 2.11
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 04:03:40",
   "seed_lat": -68.29166,
   "seed_lon": -157.62499,
   "seed_alt_m": 12000.0,
   "seed_age_h": 1.27,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-03 03:30:00",
    "lat": -75.0147,
    "lon": 160.55444,
    "alt_m": 12018.9
   },
   "member_spread_deg": {
    "lat": 13.15,
    "lon": 310.52
   },
   "member_spread_now_deg": {
    "lat": 0.25,
    "lon": 0.65
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 04:12:18",
   "seed_lat": 40.97917,
   "seed_lon": 179.29167,
   "seed_alt_m": 13650.0,
   "seed_age_h": 1.13,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 03:45:00",
    "lat": -3.3513,
    "lon": -98.62369,
    "alt_m": 14060.2
   },
   "member_spread_deg": {
    "lat": 51.47,
    "lon": 46.11
   },
   "member_spread_now_deg": {
    "lat": 0.14,
    "lon": 0.79
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 20:38:18",
   "seed_lat": 48.0,
   "seed_lon": -80.91667,
   "seed_alt_m": 13080.0,
   "seed_age_h": 8.7,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 23:45:00",
    "lat": 42.41016,
    "lon": 94.59694,
    "alt_m": 13039.1
   },
   "member_spread_deg": {
    "lat": 18.61,
    "lon": 127.45
   },
   "member_spread_now_deg": {
    "lat": 1.71,
    "lon": 6.68
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 03:36:18",
   "seed_lat": 44.6875,
   "seed_lon": 150.83333,
   "seed_alt_m": 13610.0,
   "seed_age_h": 1.73,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 03:00:00",
    "lat": 42.7556,
    "lon": -5.8428,
    "alt_m": 14048.9
   },
   "member_spread_deg": {
    "lat": 35.59,
    "lon": 139.03
   },
   "member_spread_now_deg": {
    "lat": 0.17,
    "lon": 0.75
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BZ-7",
   "flight_id": "BZ-7_2026-08-06",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 07:29:00",
   "seed_lat": 31.91667,
   "seed_lon": 0.95833,
   "seed_alt_m": 11580.0,
   "seed_age_h": 141.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-02 23:30:00",
    "lat": 42.75854,
    "lon": -118.38541,
    "alt_m": 11443.1
   },
   "member_spread_deg": {
    "lat": 40.19,
    "lon": 234.18
   },
   "member_spread_now_deg": {
    "lat": 14.69,
    "lon": 131.49
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 21:03:46",
   "seed_lat": 46.58333,
   "seed_lon": -81.25,
   "seed_alt_m": 12320.0,
   "seed_age_h": 8.27,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-02 23:30:00",
    "lat": 34.19239,
    "lon": 71.29362,
    "alt_m": 12541.7
   },
   "member_spread_deg": {
    "lat": 15.54,
    "lon": 98.95
   },
   "member_spread_now_deg": {
    "lat": 0.94,
    "lon": 6.26
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 20:34:32",
   "seed_lat": 46.65512,
   "seed_lon": -81.43229,
   "seed_alt_m": 12330.0,
   "seed_age_h": 8.76,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 23:30:00",
    "lat": 30.4414,
    "lon": 33.28189,
    "alt_m": 12456.4
   },
   "member_spread_deg": {
    "lat": 16.79,
    "lon": 108.22
   },
   "member_spread_now_deg": {
    "lat": 1.04,
    "lon": 6.7
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-30",
   "flight_id": "DG2GG-30_2026-08-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 13:21:00",
   "seed_lat": 40.22917,
   "seed_lon": 25.54167,
   "seed_alt_m": 12550.0,
   "seed_age_h": 63.98,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 23:45:00",
    "lat": 45.65336,
    "lon": -127.12613,
    "alt_m": 12913.8
   },
   "member_spread_deg": {
    "lat": 9.88,
    "lon": 324.88
   },
   "member_spread_now_deg": {
    "lat": 22.36,
    "lon": 12.05
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-31",
   "flight_id": "DG2GG-31_2026-08-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 00:22:00",
   "seed_lat": 30.54167,
   "seed_lon": -132.33333,
   "seed_alt_m": 13420.0,
   "seed_age_h": 4.97,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 23:45:00",
    "lat": 27.2167,
    "lon": -30.79502,
    "alt_m": 13633.2
   },
   "member_spread_deg": {
    "lat": 44.08,
    "lon": 78.39
   },
   "member_spread_now_deg": {
    "lat": 1.67,
    "lon": 0.24
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-32",
   "flight_id": "DG2GG-32_2026-09-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 19:41:00",
   "seed_lat": 53.8125,
   "seed_lon": -132.08333,
   "seed_alt_m": 12890.0,
   "seed_age_h": 9.65,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 23:45:00",
    "lat": 71.60214,
    "lon": 33.7412,
    "alt_m": 13456.7
   },
   "member_spread_deg": {
    "lat": 17.28,
    "lon": 62.47
   },
   "member_spread_now_deg": {
    "lat": 1.77,
    "lon": 1.72
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 01:10:00",
   "seed_lat": 39.39583,
   "seed_lon": 176.41667,
   "seed_alt_m": 13410.0,
   "seed_age_h": 4.17,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 00:45:00",
    "lat": 21.71238,
    "lon": -92.10267,
    "alt_m": 13544.5
   },
   "member_spread_deg": {
    "lat": 40.65,
    "lon": 19.83
   },
   "member_spread_now_deg": {
    "lat": 0.26,
    "lon": 2.06
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DO3GU-44",
   "flight_id": "DO3GU-44_2026-07-29",
   "payload_type": "WSPR",
   "seed_time": "2026-09-18 13:18:43",
   "seed_lat": 35.89583,
   "seed_lon": -76.25,
   "seed_alt_m": 15219.0,
   "seed_age_h": 184.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 23:45:00",
    "lat": 2.51081,
    "lon": -26.20245,
    "alt_m": 15320.9
   },
   "member_spread_deg": {
    "lat": 52.26,
    "lon": 274.22
   },
   "member_spread_now_deg": {
    "lat": 47.69,
    "lon": 77.06
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DO3GU-48",
   "flight_id": "DO3GU-48_2026-09-08",
   "payload_type": "WSPR",
   "seed_time": "2026-09-18 07:36:22",
   "seed_lat": 68.0,
   "seed_lon": 83.29167,
   "seed_alt_m": 14417.0,
   "seed_age_h": 189.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 23:30:00",
    "lat": 59.90537,
    "lon": 35.25031,
    "alt_m": 14592.8
   },
   "member_spread_deg": {
    "lat": 22.72,
    "lon": 132.84
   },
   "member_spread_now_deg": {
    "lat": 10.28,
    "lon": 41.77
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "DO3GU-49",
   "flight_id": "DO3GU-49_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-19 12:40:28",
   "seed_lat": 39.83333,
   "seed_lon": 60.66667,
   "seed_alt_m": 13990.0,
   "seed_age_h": 160.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-02 23:45:00",
    "lat": 23.50201,
    "lon": -72.26855,
    "alt_m": 14454.5
   },
   "member_spread_deg": {
    "lat": 50.52,
    "lon": 307.76
   },
   "member_spread_now_deg": {
    "lat": 37.47,
    "lon": 352.55
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DO3GU-8",
   "flight_id": "DO3GU-8_2026-08-12",
   "payload_type": "APRS",
   "seed_time": "2026-09-24 02:46:08",
   "seed_lat": 45.11771,
   "seed_lon": 143.63833,
   "seed_alt_m": 13946.0,
   "seed_age_h": 50.57,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-02 23:45:00",
    "lat": 56.67085,
    "lon": -1.28369,
    "alt_m": 13942.8
   },
   "member_spread_deg": {
    "lat": 27.27,
    "lon": 28.09
   },
   "member_spread_now_deg": {
    "lat": 6.09,
    "lon": 15.1
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 17:03:00",
   "seed_lat": 40.33333,
   "seed_lon": -18.0,
   "seed_alt_m": 13550.0,
   "seed_age_h": 12.28,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 23:30:00",
    "lat": 45.30178,
    "lon": 94.9767,
    "alt_m": 13166.2
   },
   "member_spread_deg": {
    "lat": 9.51,
    "lon": 125.46
   },
   "member_spread_now_deg": {
    "lat": 0.52,
    "lon": 3.34
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KC3LBR-485",
   "flight_id": "KC3LBR-485_2026-03-19",
   "payload_type": "WSPR",
   "seed_time": "2026-09-15 23:15:47",
   "seed_lat": 26.64583,
   "seed_lon": -149.20833,
   "seed_alt_m": 13760.0,
   "seed_age_h": 246.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-02 23:45:00",
    "lat": 26.3338,
    "lon": 68.22323,
    "alt_m": 13727.4
   },
   "member_spread_deg": {
    "lat": 45.09,
    "lon": 243.32
   },
   "member_spread_now_deg": {
    "lat": 48.04,
    "lon": 113.33
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC5TRB-1",
   "flight_id": "KC5TRB-1_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 04:55:43",
   "seed_lat": 47.10411,
   "seed_lon": 148.79169,
   "seed_alt_m": 13000.0,
   "seed_age_h": 144.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 23:30:00",
    "lat": 32.74213,
    "lon": 33.01761,
    "alt_m": 13057.3
   },
   "member_spread_deg": {
    "lat": 18.24,
    "lon": 224.15
   },
   "member_spread_now_deg": {
    "lat": 24.21,
    "lon": 76.13
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KD7FXO-1",
   "flight_id": "KD7FXO-1_2026-08-02",
   "payload_type": "WSPR",
   "seed_time": "2026-09-12 06:05:00",
   "seed_lat": 45.47917,
   "seed_lon": 159.375,
   "seed_alt_m": 12660.0,
   "seed_age_h": 335.25,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 23:30:00",
    "lat": 38.34651,
    "lon": -29.45609,
    "alt_m": 13067.5
   },
   "member_spread_deg": {
    "lat": 37.33,
    "lon": 303.13
   },
   "member_spread_now_deg": {
    "lat": 22.24,
    "lon": 287.42
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KE8RES-8",
   "flight_id": "KE8RES-8_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-09-13 13:01:00",
   "seed_lat": 42.0625,
   "seed_lon": 28.04167,
   "seed_alt_m": 12700.0,
   "seed_age_h": 304.32,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 23:30:00",
    "lat": 59.97438,
    "lon": 112.06369,
    "alt_m": 12344.5
   },
   "member_spread_deg": {
    "lat": 26.49,
    "lon": 306.73
   },
   "member_spread_now_deg": {
    "lat": 28.11,
    "lon": 184.45
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 18:45:45",
   "seed_lat": 71.97911,
   "seed_lon": -68.08331,
   "seed_alt_m": 12900.0,
   "seed_age_h": 10.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 23:45:00",
    "lat": 80.93744,
    "lon": 78.9228,
    "alt_m": 12984.9
   },
   "member_spread_deg": {
    "lat": 47.67,
    "lon": 112.08
   },
   "member_spread_now_deg": {
    "lat": 4.4,
    "lon": 1.43
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
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 ]
}