{
 "generated_utc": "2026-10-01T05:27:30Z",
 "gfs_cycle_utc": "2026-10-01T00:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 472.0,
  "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_20261001_00Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20261001_00Z.geojson.gz"
 },
 "counts": {
  "flights": 49,
  "members": 9,
  "rows": 201267
 },
 "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": 181.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 23:45:00",
    "lat": 39.29275,
    "lon": -56.53847,
    "alt_m": 13374.8
   },
   "member_spread_deg": {
    "lat": 43.68,
    "lon": 141.23
   },
   "member_spread_now_deg": {
    "lat": 19.23,
    "lon": 92.89
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "AE4ZZ-23",
   "flight_id": "AE4ZZ-23_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 05:01:41",
   "seed_lat": 38.81247,
   "seed_lon": 74.625,
   "seed_alt_m": 13040.0,
   "seed_age_h": 0.31,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 05:00:00",
    "lat": 41.52312,
    "lon": -102.31299,
    "alt_m": 13250.3
   },
   "member_spread_deg": {
    "lat": 20.24,
    "lon": 58.97
   },
   "member_spread_now_deg": {
    "lat": 0.09,
    "lon": 0.07
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 04:53:40",
   "seed_lat": -64.3125,
   "seed_lon": 139.54168,
   "seed_alt_m": 12060.0,
   "seed_age_h": 0.44,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-08 05:00:00",
    "lat": -62.75117,
    "lon": 92.68222,
    "alt_m": 11820.9
   },
   "member_spread_deg": {
    "lat": 17.93,
    "lon": 75.33
   },
   "member_spread_now_deg": {
    "lat": 0.01,
    "lon": 0.21
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 20:22:48",
   "seed_lat": 36.1875,
   "seed_lon": -75.95833,
   "seed_alt_m": 13644.0,
   "seed_age_h": 8.95,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 23:30:00",
    "lat": 17.86944,
    "lon": -60.38442,
    "alt_m": 13935.7
   },
   "member_spread_deg": {
    "lat": 11.47,
    "lon": 45.57
   },
   "member_spread_now_deg": {
    "lat": 2.39,
    "lon": 4.38
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 18:47:18",
   "seed_lat": 30.58333,
   "seed_lon": -24.79167,
   "seed_alt_m": 13570.0,
   "seed_age_h": 10.55,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 23:45:00",
    "lat": 48.69976,
    "lon": 150.83383,
    "alt_m": 12804.1
   },
   "member_spread_deg": {
    "lat": 15.48,
    "lon": 59.89
   },
   "member_spread_now_deg": {
    "lat": 0.92,
    "lon": 2.21
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 19:00:48",
   "seed_lat": 57.95833,
   "seed_lon": -59.125,
   "seed_alt_m": 13400.0,
   "seed_age_h": 10.32,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 23:30:00",
    "lat": 48.48744,
    "lon": 22.244,
    "alt_m": 13664.9
   },
   "member_spread_deg": {
    "lat": 29.81,
    "lon": 319.36
   },
   "member_spread_now_deg": {
    "lat": 4.05,
    "lon": 6.83
   },
   "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": 261.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-07 23:30:00",
    "lat": 9.5531,
    "lon": -179.06797,
    "alt_m": 11537.5
   },
   "member_spread_deg": {
    "lat": 35.6,
    "lon": 263.2
   },
   "member_spread_now_deg": {
    "lat": 23.31,
    "lon": 291.82
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 14:03:54",
   "seed_lat": 25.04167,
   "seed_lon": 29.04167,
   "seed_alt_m": 12630.0,
   "seed_age_h": 15.27,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 23:30:00",
    "lat": 48.5944,
    "lon": -63.58639,
    "alt_m": 12068.6
   },
   "member_spread_deg": {
    "lat": 25.25,
    "lon": 68.32
   },
   "member_spread_now_deg": {
    "lat": 4.33,
    "lon": 4.37
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 13:40:32",
   "seed_lat": 24.96823,
   "seed_lon": 28.62083,
   "seed_alt_m": 12650.0,
   "seed_age_h": 15.66,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 23:45:00",
    "lat": 44.22184,
    "lon": -70.79979,
    "alt_m": 12282.3
   },
   "member_spread_deg": {
    "lat": 23.4,
    "lon": 65.58
   },
   "member_spread_now_deg": {
    "lat": 4.27,
    "lon": 4.06
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-30",
   "flight_id": "DG2GG-30_2026-08-07",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 00:16:00",
   "seed_lat": 54.20833,
   "seed_lon": 172.41667,
   "seed_alt_m": 12150.0,
   "seed_age_h": 5.07,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-07 23:45:00",
    "lat": 36.46165,
    "lon": -12.12411,
    "alt_m": 12836.3
   },
   "member_spread_deg": {
    "lat": 39.41,
    "lon": 92.99
   },
   "member_spread_now_deg": {
    "lat": 0.33,
    "lon": 4.25
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-31",
   "flight_id": "DG2GG-31_2026-08-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 14:02:00",
   "seed_lat": 21.33333,
   "seed_lon": -81.66667,
   "seed_alt_m": 13590.0,
   "seed_age_h": 63.3,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 23:30:00",
    "lat": 31.07042,
    "lon": 42.57733,
    "alt_m": 13522.0
   },
   "member_spread_deg": {
    "lat": 11.04,
    "lon": 81.93
   },
   "member_spread_now_deg": {
    "lat": 12.13,
    "lon": 32.22
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-32",
   "flight_id": "DG2GG-32_2026-09-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 14:26:00",
   "seed_lat": 56.64583,
   "seed_lon": -16.75,
   "seed_alt_m": 13030.0,
   "seed_age_h": 38.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 23:30:00",
    "lat": 51.10488,
    "lon": 101.17808,
    "alt_m": 12814.2
   },
   "member_spread_deg": {
    "lat": 24.77,
    "lon": 321.66
   },
   "member_spread_now_deg": {
    "lat": 18.08,
    "lon": 7.46
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 20:10:00",
   "seed_lat": 44.35417,
   "seed_lon": -95.0,
   "seed_alt_m": 13420.0,
   "seed_age_h": 9.17,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 23:45:00",
    "lat": 13.65688,
    "lon": -83.41214,
    "alt_m": 13657.0
   },
   "member_spread_deg": {
    "lat": 34.1,
    "lon": 106.33
   },
   "member_spread_now_deg": {
    "lat": 3.07,
    "lon": 5.33
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-36",
   "flight_id": "DG2GG-36_2026-09-26",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 04:55:00",
   "seed_lat": 43.60417,
   "seed_lon": 90.70833,
   "seed_alt_m": 12940.0,
   "seed_age_h": 0.42,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 05:00:00",
    "lat": 35.66807,
    "lon": -84.66505,
    "alt_m": 13151.8
   },
   "member_spread_deg": {
    "lat": 34.14,
    "lon": 135.36
   },
   "member_spread_now_deg": {
    "lat": 0.04,
    "lon": 0.1
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DH1PR-578",
   "flight_id": "DH1PR-578_2026-09-27",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 04:56:16",
   "seed_lat": 39.72917,
   "seed_lon": 33.25,
   "seed_alt_m": 11450.0,
   "seed_age_h": 0.4,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 05:00:00",
    "lat": 49.332,
    "lon": -59.46208,
    "alt_m": 11271.7
   },
   "member_spread_deg": {
    "lat": 10.01,
    "lon": 28.27
   },
   "member_spread_now_deg": {
    "lat": 0.02,
    "lon": 0.02
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DH1PR-578e",
   "flight_id": "DH1PR-578e_2026-09-27",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 04:57:01",
   "seed_lat": 39.7309,
   "seed_lon": 33.26875,
   "seed_alt_m": 11450.0,
   "seed_age_h": 0.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 05:00:00",
    "lat": 49.36453,
    "lon": -59.6196,
    "alt_m": 11271.1
   },
   "member_spread_deg": {
    "lat": 9.98,
    "lon": 28.36
   },
   "member_spread_now_deg": {
    "lat": 0.02,
    "lon": 0.02
   },
   "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": 304.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 23:45:00",
    "lat": 7.19546,
    "lon": -49.72274,
    "alt_m": 15304.2
   },
   "member_spread_deg": {
    "lat": 60.57,
    "lon": 249.73
   },
   "member_spread_now_deg": {
    "lat": 47.06,
    "lon": 188.81
   },
   "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": 309.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 23:30:00",
    "lat": 81.16652,
    "lon": 93.9497,
    "alt_m": 14028.9
   },
   "member_spread_deg": {
    "lat": 38.69,
    "lon": 296.91
   },
   "member_spread_now_deg": {
    "lat": 31.59,
    "lon": 48.97
   },
   "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": 280.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-07 23:45:00",
    "lat": 22.67077,
    "lon": 8.20782,
    "alt_m": 14344.0
   },
   "member_spread_deg": {
    "lat": 46.68,
    "lon": 312.67
   },
   "member_spread_now_deg": {
    "lat": 57.45,
    "lon": 281.16
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DO3GU-8",
   "flight_id": "DO3GU-8_2026-08-12",
   "payload_type": "APRS",
   "seed_time": "2026-09-30 15:43:46",
   "seed_lat": 54.64466,
   "seed_lon": -1.98475,
   "seed_alt_m": 14350.0,
   "seed_age_h": 13.6,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 23:45:00",
    "lat": 60.15227,
    "lon": -171.02942,
    "alt_m": 13659.7
   },
   "member_spread_deg": {
    "lat": 14.12,
    "lon": 339.93
   },
   "member_spread_now_deg": {
    "lat": 9.4,
    "lon": 4.16
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 13:43:00",
   "seed_lat": 34.41667,
   "seed_lon": 25.91667,
   "seed_alt_m": 13160.0,
   "seed_age_h": 15.62,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 23:45:00",
    "lat": 44.17767,
    "lon": -87.66152,
    "alt_m": 12944.4
   },
   "member_spread_deg": {
    "lat": 10.34,
    "lon": 68.5
   },
   "member_spread_now_deg": {
    "lat": 0.71,
    "lon": 1.2
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 264.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 23:30:00",
    "lat": 46.13401,
    "lon": 43.00987,
    "alt_m": 12947.5
   },
   "member_spread_deg": {
    "lat": 24.17,
    "lon": 349.51
   },
   "member_spread_now_deg": {
    "lat": 27.73,
    "lon": 148.2
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 16:45:45",
   "seed_lat": 50.99995,
   "seed_lon": -11.95831,
   "seed_alt_m": 13150.0,
   "seed_age_h": 12.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 23:45:00",
    "lat": 58.0445,
    "lon": -156.7736,
    "alt_m": 12835.7
   },
   "member_spread_deg": {
    "lat": 13.16,
    "lon": 271.92
   },
   "member_spread_now_deg": {
    "lat": 3.32,
    "lon": 1.86
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KJ4AWK-1",
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   "float_reliable": true,
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   },
   "member_spread_deg": {
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  }
 ]
}