{
 "generated_utc": "2026-09-27T23:27:29Z",
 "gfs_cycle_utc": "2026-09-27T18:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 477.5,
  "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_20260927_18Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260927_18Z.geojson.gz"
 },
 "counts": {
  "flights": 45,
  "members": 9,
  "rows": 192051
 },
 "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": 103.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 17:45:00",
    "lat": 33.36723,
    "lon": -152.09802,
    "alt_m": 13505.3
   },
   "member_spread_deg": {
    "lat": 40.16,
    "lon": 334.36
   },
   "member_spread_now_deg": {
    "lat": 47.51,
    "lon": 86.22
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "AE4ZZ-23",
   "flight_id": "AE4ZZ-23_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 14:20:00",
   "seed_lat": 31.18747,
   "seed_lon": 12.16668,
   "seed_alt_m": 13490.0,
   "seed_age_h": 9.0,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 17:45:00",
    "lat": 53.47908,
    "lon": -130.15972,
    "alt_m": 12756.9
   },
   "member_spread_deg": {
    "lat": 21.69,
    "lon": 315.14
   },
   "member_spread_now_deg": {
    "lat": 1.31,
    "lon": 0.54
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 21:33:40",
   "seed_lat": -72.83333,
   "seed_lon": -85.49999,
   "seed_alt_m": 12120.0,
   "seed_age_h": 25.77,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-04 17:30:00",
    "lat": -70.8348,
    "lon": -104.98258,
    "alt_m": 12235.0
   },
   "member_spread_deg": {
    "lat": 10.62,
    "lon": 279.16
   },
   "member_spread_now_deg": {
    "lat": 5.87,
    "lon": 14.97
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 22:52:48",
   "seed_lat": 37.58333,
   "seed_lon": -134.04167,
   "seed_alt_m": 13540.0,
   "seed_age_h": 0.45,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 23:00:00",
    "lat": 45.41098,
    "lon": -15.13662,
    "alt_m": 13693.0
   },
   "member_spread_deg": {
    "lat": 46.43,
    "lon": 86.63
   },
   "member_spread_now_deg": {
    "lat": 0.22,
    "lon": 0.13
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 18:14:18",
   "seed_lat": 26.75,
   "seed_lon": -31.79167,
   "seed_alt_m": 13660.0,
   "seed_age_h": 5.1,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 17:45:00",
    "lat": 21.52062,
    "lon": 24.21533,
    "alt_m": 13656.9
   },
   "member_spread_deg": {
    "lat": 11.96,
    "lon": 54.77
   },
   "member_spread_now_deg": {
    "lat": 0.47,
    "lon": 2.55
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 21:34:18",
   "seed_lat": 54.14583,
   "seed_lon": -137.125,
   "seed_alt_m": 13300.0,
   "seed_age_h": 1.76,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 21:00:00",
    "lat": 57.78131,
    "lon": 42.76785,
    "alt_m": 13545.9
   },
   "member_spread_deg": {
    "lat": 39.08,
    "lon": 125.72
   },
   "member_spread_now_deg": {
    "lat": 0.29,
    "lon": 1.38
   },
   "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": 183.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-04 17:30:00",
    "lat": 31.84075,
    "lon": -135.49953,
    "alt_m": 11345.5
   },
   "member_spread_deg": {
    "lat": 23.39,
    "lon": 195.31
   },
   "member_spread_now_deg": {
    "lat": 26.21,
    "lon": 309.66
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 17:59:16",
   "seed_lat": 47.625,
   "seed_lon": -45.70833,
   "seed_alt_m": 12050.0,
   "seed_age_h": 5.35,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-04 17:30:00",
    "lat": 44.46983,
    "lon": 154.53038,
    "alt_m": 12216.0
   },
   "member_spread_deg": {
    "lat": 15.94,
    "lon": 74.94
   },
   "member_spread_now_deg": {
    "lat": 2.17,
    "lon": 5.95
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 17:19:31",
   "seed_lat": 48.06432,
   "seed_lon": -47.87257,
   "seed_alt_m": 11990.0,
   "seed_age_h": 6.01,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-04 17:45:00",
    "lat": 35.88521,
    "lon": 128.68725,
    "alt_m": 12150.4
   },
   "member_spread_deg": {
    "lat": 17.68,
    "lon": 77.34
   },
   "member_spread_now_deg": {
    "lat": 2.51,
    "lon": 6.97
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-30",
   "flight_id": "DG2GG-30_2026-08-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 11:56:00",
   "seed_lat": 72.0,
   "seed_lon": 49.83333,
   "seed_alt_m": 12800.0,
   "seed_age_h": 35.4,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 17:30:00",
    "lat": 35.73353,
    "lon": -160.47217,
    "alt_m": 12599.9
   },
   "member_spread_deg": {
    "lat": 28.53,
    "lon": 180.84
   },
   "member_spread_now_deg": {
    "lat": 9.89,
    "lon": 12.72
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-31",
   "flight_id": "DG2GG-31_2026-08-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 21:47:00",
   "seed_lat": 25.35417,
   "seed_lon": -90.20833,
   "seed_alt_m": 13670.0,
   "seed_age_h": 1.55,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 21:15:00",
    "lat": 28.73795,
    "lon": 12.49519,
    "alt_m": 13651.1
   },
   "member_spread_deg": {
    "lat": 19.99,
    "lon": 57.68
   },
   "member_spread_now_deg": {
    "lat": 0.52,
    "lon": 0.39
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-32",
   "flight_id": "DG2GG-32_2026-09-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 23:16:00",
   "seed_lat": 58.95833,
   "seed_lon": -106.375,
   "seed_alt_m": 12930.0,
   "seed_age_h": 24.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 17:45:00",
    "lat": 61.94627,
    "lon": 68.12889,
    "alt_m": 12981.8
   },
   "member_spread_deg": {
    "lat": 39.71,
    "lon": 96.23
   },
   "member_spread_now_deg": {
    "lat": 9.09,
    "lon": 27.94
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 22:15:00",
   "seed_lat": 35.3125,
   "seed_lon": -141.0,
   "seed_alt_m": 13390.0,
   "seed_age_h": 1.08,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 21:45:00",
    "lat": 21.30752,
    "lon": -64.66371,
    "alt_m": 13722.2
   },
   "member_spread_deg": {
    "lat": 57.96,
    "lon": 86.47
   },
   "member_spread_now_deg": {
    "lat": 0.15,
    "lon": 0.44
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-36",
   "flight_id": "DG2GG-36_2026-09-26",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 12:55:00",
   "seed_lat": 42.875,
   "seed_lon": 16.625,
   "seed_alt_m": 13370.0,
   "seed_age_h": 10.42,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 17:30:00",
    "lat": 56.86969,
    "lon": -169.4401,
    "alt_m": 12584.8
   },
   "member_spread_deg": {
    "lat": 20.91,
    "lon": 344.71
   },
   "member_spread_now_deg": {
    "lat": 1.03,
    "lon": 5.4
   },
   "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": 226.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 17:45:00",
    "lat": 11.83678,
    "lon": -25.43377,
    "alt_m": 15304.6
   },
   "member_spread_deg": {
    "lat": 58.7,
    "lon": 258.78
   },
   "member_spread_now_deg": {
    "lat": 49.93,
    "lon": 96.19
   },
   "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": 231.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 17:30:00",
    "lat": 48.56062,
    "lon": 80.29714,
    "alt_m": 14460.8
   },
   "member_spread_deg": {
    "lat": 25.28,
    "lon": 56.93
   },
   "member_spread_now_deg": {
    "lat": 12.45,
    "lon": 57.96
   },
   "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": 202.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-04 17:45:00",
    "lat": 11.76108,
    "lon": -85.14995,
    "alt_m": 14475.7
   },
   "member_spread_deg": {
    "lat": 81.14,
    "lon": 222.43
   },
   "member_spread_now_deg": {
    "lat": 46.73,
    "lon": 337.41
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DO3GU-8",
   "flight_id": "DO3GU-8_2026-08-12",
   "payload_type": "APRS",
   "seed_time": "2026-09-26 19:41:35",
   "seed_lat": 47.76366,
   "seed_lon": -113.55491,
   "seed_alt_m": 14135.0,
   "seed_age_h": 27.64,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 17:45:00",
    "lat": 43.38999,
    "lon": 58.28421,
    "alt_m": 14069.2
   },
   "member_spread_deg": {
    "lat": 36.3,
    "lon": 73.74
   },
   "member_spread_now_deg": {
    "lat": 7.08,
    "lon": 20.13
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 14:28:00",
   "seed_lat": 47.77083,
   "seed_lon": 8.54167,
   "seed_alt_m": 13450.0,
   "seed_age_h": 8.87,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 17:30:00",
    "lat": 43.64974,
    "lon": 134.07828,
    "alt_m": 12791.4
   },
   "member_spread_deg": {
    "lat": 20.6,
    "lon": 306.32
   },
   "member_spread_now_deg": {
    "lat": 0.95,
    "lon": 1.65
   },
   "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": 288.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-04 17:45:00",
    "lat": 38.11009,
    "lon": -176.85405,
    "alt_m": 13694.1
   },
   "member_spread_deg": {
    "lat": 37.29,
    "lon": 348.16
   },
   "member_spread_now_deg": {
    "lat": 27.82,
    "lon": 149.0
   },
   "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": 186.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 17:30:00",
    "lat": 51.79385,
    "lon": 102.81929,
    "alt_m": 12932.5
   },
   "member_spread_deg": {
    "lat": 33.66,
    "lon": 202.71
   },
   "member_spread_now_deg": {
    "lat": 23.22,
    "lon": 120.65
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 18:15:45",
   "seed_lat": 62.99995,
   "seed_lon": -42.91665,
   "seed_alt_m": 12870.0,
   "seed_age_h": 5.07,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 17:45:00",
    "lat": 79.8165,
    "lon": -15.14533,
    "alt_m": 12866.0
   },
   "member_spread_deg": {
    "lat": 15.02,
    "lon": 121.49
   },
   "member_spread_now_deg": {
    "lat": 0.54,
    "lon": 0.9
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KJ4AWK-1",
   "flight_id": "KJ4AWK-1_2026-08-22",
   "payload_type": "APRS",
   "seed_time": "2026-09-26 23:40:52",
   "seed_lat": 59.10342,
   "seed_lon": -116.23583,
   "seed_alt_m": 12175.0,
   "seed_age_h": 23.65,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-04 17:45:00",
    "lat": 57.90997,
    "lon": 34.86608,
    "alt_m": 12724.3
   },
   "member_spread_deg": {
    "lat": 27.71,
    "lon": 92.94
   },
   "member_spread_now_deg": {
    "lat": 6.58,
    "lon": 8.66
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
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  },
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  },
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  {
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  {
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  }
 ]
}