{
 "generated_utc": "2026-09-25T05:27:38Z",
 "gfs_cycle_utc": "2026-09-25T00:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 473.5,
  "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_20260925_00Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260925_00Z.geojson.gz"
 },
 "counts": {
  "flights": 49,
  "members": 9,
  "rows": 210060
 },
 "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": 37.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 23:45:00",
    "lat": 44.64775,
    "lon": 98.56843,
    "alt_m": 13171.7
   },
   "member_spread_deg": {
    "lat": 20.73,
    "lon": 331.3
   },
   "member_spread_now_deg": {
    "lat": 23.48,
    "lon": 4.85
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AE4ZZ-23",
   "flight_id": "AE4ZZ-23_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 14:25:00",
   "seed_lat": 54.93747,
   "seed_lon": -7.12495,
   "seed_alt_m": 13260.0,
   "seed_age_h": 14.92,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 23:30:00",
    "lat": 38.47427,
    "lon": 119.7563,
    "alt_m": 12910.4
   },
   "member_spread_deg": {
    "lat": 19.01,
    "lon": 74.43
   },
   "member_spread_now_deg": {
    "lat": 8.22,
    "lon": 2.05
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 04:43:40",
   "seed_lat": -60.0625,
   "seed_lon": 140.50001,
   "seed_alt_m": 12180.0,
   "seed_age_h": 0.61,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-02 04:45:00",
    "lat": -71.35911,
    "lon": 138.20475,
    "alt_m": 12174.3
   },
   "member_spread_deg": {
    "lat": 9.54,
    "lon": 310.59
   },
   "member_spread_now_deg": {
    "lat": 0.15,
    "lon": 0.29
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AIRCOR-6",
   "flight_id": "AIRCOR-6_2026-09-14",
   "payload_type": "APRS",
   "seed_time": "2026-09-23 15:39:13",
   "seed_lat": 40.33008,
   "seed_lon": -104.83542,
   "seed_alt_m": 15554.0,
   "seed_age_h": 37.68,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 23:45:00",
    "lat": 25.08981,
    "lon": -59.99265,
    "alt_m": 15840.7
   },
   "member_spread_deg": {
    "lat": 23.18,
    "lon": 82.44
   },
   "member_spread_now_deg": {
    "lat": 15.33,
    "lon": 16.91
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 03:39:18",
   "seed_lat": 32.20833,
   "seed_lon": 164.54167,
   "seed_alt_m": 13720.0,
   "seed_age_h": 1.68,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 03:15:00",
    "lat": 15.49543,
    "lon": -90.88508,
    "alt_m": 13869.1
   },
   "member_spread_deg": {
    "lat": 40.53,
    "lon": 45.9
   },
   "member_spread_now_deg": {
    "lat": 0.36,
    "lon": 0.38
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 21:36:48",
   "seed_lat": 50.52083,
   "seed_lon": -101.0,
   "seed_alt_m": 13080.0,
   "seed_age_h": 7.72,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 23:30:00",
    "lat": 41.01958,
    "lon": 55.97632,
    "alt_m": 13033.5
   },
   "member_spread_deg": {
    "lat": 13.75,
    "lon": 45.53
   },
   "member_spread_now_deg": {
    "lat": 3.28,
    "lon": 2.95
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 04:42:18",
   "seed_lat": 44.27083,
   "seed_lon": 115.79167,
   "seed_alt_m": 13740.0,
   "seed_age_h": 0.63,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 04:45:00",
    "lat": 56.49797,
    "lon": -10.10476,
    "alt_m": 13555.2
   },
   "member_spread_deg": {
    "lat": 36.04,
    "lon": 91.88
   },
   "member_spread_now_deg": {
    "lat": 0.03,
    "lon": 0.08
   },
   "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": 117.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-01 23:30:00",
    "lat": 34.32084,
    "lon": -157.07162,
    "alt_m": 11316.3
   },
   "member_spread_deg": {
    "lat": 56.56,
    "lon": 215.89
   },
   "member_spread_now_deg": {
    "lat": 18.97,
    "lon": 101.09
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 21:54:01",
   "seed_lat": 50.14583,
   "seed_lon": -98.875,
   "seed_alt_m": 12370.0,
   "seed_age_h": 7.43,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 23:30:00",
    "lat": 41.53914,
    "lon": 41.9869,
    "alt_m": 12306.8
   },
   "member_spread_deg": {
    "lat": 35.08,
    "lon": 98.18
   },
   "member_spread_now_deg": {
    "lat": 2.91,
    "lon": 4.18
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 21:34:32",
   "seed_lat": 50.13758,
   "seed_lon": -99.1934,
   "seed_alt_m": 12360.0,
   "seed_age_h": 7.76,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 23:30:00",
    "lat": 35.42348,
    "lon": 35.01595,
    "alt_m": 12334.5
   },
   "member_spread_deg": {
    "lat": 34.95,
    "lon": 118.48
   },
   "member_spread_now_deg": {
    "lat": 3.08,
    "lon": 4.27
   },
   "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": 39.98,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 23:45:00",
    "lat": 34.0595,
    "lon": -172.09572,
    "alt_m": 13093.1
   },
   "member_spread_deg": {
    "lat": 17.64,
    "lon": 354.26
   },
   "member_spread_now_deg": {
    "lat": 4.23,
    "lon": 15.73
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-31",
   "flight_id": "DG2GG-31_2026-08-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 00:57:00",
   "seed_lat": 41.0,
   "seed_lon": -139.58333,
   "seed_alt_m": 13260.0,
   "seed_age_h": 4.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 00:30:00",
    "lat": 30.81259,
    "lon": -29.06571,
    "alt_m": 13616.7
   },
   "member_spread_deg": {
    "lat": 57.87,
    "lon": 107.08
   },
   "member_spread_now_deg": {
    "lat": 0.59,
    "lon": 2.72
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-32",
   "flight_id": "DG2GG-32_2026-09-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 21:26:00",
   "seed_lat": 58.625,
   "seed_lon": -153.83333,
   "seed_alt_m": 13070.0,
   "seed_age_h": 7.9,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 23:30:00",
    "lat": 61.78936,
    "lon": -4.7192,
    "alt_m": 12821.8
   },
   "member_spread_deg": {
    "lat": 30.49,
    "lon": 107.86
   },
   "member_spread_now_deg": {
    "lat": 0.43,
    "lon": 1.86
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 04:25:00",
   "seed_lat": 28.02083,
   "seed_lon": 164.04167,
   "seed_alt_m": 13420.0,
   "seed_age_h": 0.92,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 04:00:00",
    "lat": 41.47646,
    "lon": -91.42787,
    "alt_m": 13396.1
   },
   "member_spread_deg": {
    "lat": 43.85,
    "lon": 58.23
   },
   "member_spread_now_deg": {
    "lat": 0.44,
    "lon": 0.19
   },
   "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": 160.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 23:45:00",
    "lat": -1.23354,
    "lon": -38.11713,
    "alt_m": 15342.1
   },
   "member_spread_deg": {
    "lat": 54.93,
    "lon": 233.78
   },
   "member_spread_now_deg": {
    "lat": 42.24,
    "lon": 81.36
   },
   "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": 165.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 23:30:00",
    "lat": 58.30419,
    "lon": -6.70407,
    "alt_m": 14288.4
   },
   "member_spread_deg": {
    "lat": 24.17,
    "lon": 46.31
   },
   "member_spread_now_deg": {
    "lat": 12.0,
    "lon": 28.75
   },
   "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": 136.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-01 23:45:00",
    "lat": 10.51243,
    "lon": -88.39909,
    "alt_m": 14459.5
   },
   "member_spread_deg": {
    "lat": 37.9,
    "lon": 313.26
   },
   "member_spread_now_deg": {
    "lat": 39.07,
    "lon": 339.25
   },
   "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": 26.57,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-01 23:45:00",
    "lat": 68.13942,
    "lon": 0.0795,
    "alt_m": 13772.4
   },
   "member_spread_deg": {
    "lat": 22.28,
    "lon": 40.75
   },
   "member_spread_now_deg": {
    "lat": 2.46,
    "lon": 23.02
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 17:33:00",
   "seed_lat": 40.8125,
   "seed_lon": -24.5,
   "seed_alt_m": 13530.0,
   "seed_age_h": 11.78,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 23:30:00",
    "lat": 44.03043,
    "lon": 84.5818,
    "alt_m": 13122.1
   },
   "member_spread_deg": {
    "lat": 10.98,
    "lon": 51.88
   },
   "member_spread_now_deg": {
    "lat": 3.77,
    "lon": 4.15
   },
   "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": 222.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 23:45:00",
    "lat": 26.5866,
    "lon": 38.49038,
    "alt_m": 13768.7
   },
   "member_spread_deg": {
    "lat": 26.79,
    "lon": 240.14
   },
   "member_spread_now_deg": {
    "lat": 53.47,
    "lon": 104.47
   },
   "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": 120.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 23:30:00",
    "lat": 64.07914,
    "lon": 19.3867,
    "alt_m": 13190.6
   },
   "member_spread_deg": {
    "lat": 32.44,
    "lon": 130.88
   },
   "member_spread_now_deg": {
    "lat": 26.9,
    "lon": 53.54
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "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": 311.25,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 23:30:00",
    "lat": 54.62373,
    "lon": -33.25388,
    "alt_m": 12193.7
   },
   "member_spread_deg": {
    "lat": 51.14,
    "lon": 316.55
   },
   "member_spread_now_deg": {
    "lat": 31.19,
    "lon": 213.68
   },
   "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": 280.32,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 23:30:00",
    "lat": 55.35514,
    "lon": 74.94169,
    "alt_m": 12302.9
   },
   "member_spread_deg": {
    "lat": 38.54,
    "lon": 301.09
   },
   "member_spread_now_deg": {
    "lat": 29.61,
    "lon": 191.38
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
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  }
 ]
}