{
 "generated_utc": "2026-09-29T05:27:52Z",
 "gfs_cycle_utc": "2026-09-29T00:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 488.5,
  "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_20260929_00Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260929_00Z.geojson.gz"
 },
 "counts": {
  "flights": 48,
  "members": 9,
  "rows": 206199
 },
 "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": 133.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 23:45:00",
    "lat": 43.52979,
    "lon": -122.53549,
    "alt_m": 13309.0
   },
   "member_spread_deg": {
    "lat": 54.23,
    "lon": 81.17
   },
   "member_spread_now_deg": {
    "lat": 35.73,
    "lon": 84.4
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "AE4ZZ-23",
   "flight_id": "AE4ZZ-23_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 09:12:30",
   "seed_lat": 29.7708,
   "seed_lon": 16.33334,
   "seed_alt_m": 13380.0,
   "seed_age_h": 20.13,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 23:45:00",
    "lat": 43.12409,
    "lon": -117.21174,
    "alt_m": 13305.9
   },
   "member_spread_deg": {
    "lat": 22.34,
    "lon": 31.1
   },
   "member_spread_now_deg": {
    "lat": 1.89,
    "lon": 3.79
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 04:53:40",
   "seed_lat": -66.25,
   "seed_lon": 59.29168,
   "seed_alt_m": 12120.0,
   "seed_age_h": 0.44,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-06 05:00:00",
    "lat": -77.85262,
    "lon": -158.64994,
    "alt_m": 12268.2
   },
   "member_spread_deg": {
    "lat": 19.72,
    "lon": 167.16
   },
   "member_spread_now_deg": {
    "lat": 0.01,
    "lon": 0.59
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 23:41:33",
   "seed_lat": 40.91667,
   "seed_lon": -112.33333,
   "seed_alt_m": 13190.0,
   "seed_age_h": 5.64,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 23:45:00",
    "lat": 36.84851,
    "lon": 4.43748,
    "alt_m": 13688.0
   },
   "member_spread_deg": {
    "lat": 25.36,
    "lon": 90.63
   },
   "member_spread_now_deg": {
    "lat": 2.38,
    "lon": 3.49
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 19:36:20",
   "seed_lat": 24.1875,
   "seed_lon": -42.04167,
   "seed_alt_m": 13660.0,
   "seed_age_h": 9.73,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 23:30:00",
    "lat": 37.48346,
    "lon": 58.74426,
    "alt_m": 13304.0
   },
   "member_spread_deg": {
    "lat": 11.56,
    "lon": 103.16
   },
   "member_spread_now_deg": {
    "lat": 1.84,
    "lon": 0.15
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 22:19:48",
   "seed_lat": 57.77083,
   "seed_lon": -110.79167,
   "seed_alt_m": 13260.0,
   "seed_age_h": 7.0,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 23:45:00",
    "lat": 50.22488,
    "lon": 57.10755,
    "alt_m": 13422.7
   },
   "member_spread_deg": {
    "lat": 31.15,
    "lon": 153.55
   },
   "member_spread_now_deg": {
    "lat": 0.51,
    "lon": 1.61
   },
   "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": 213.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-05 23:30:00",
    "lat": 29.5398,
    "lon": -99.45671,
    "alt_m": 11548.1
   },
   "member_spread_deg": {
    "lat": 43.08,
    "lon": 286.34
   },
   "member_spread_now_deg": {
    "lat": 25.38,
    "lon": 288.19
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 16:44:17",
   "seed_lat": 31.29167,
   "seed_lon": -9.75,
   "seed_alt_m": 12650.0,
   "seed_age_h": 12.6,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 23:45:00",
    "lat": 35.77808,
    "lon": -146.82441,
    "alt_m": 12492.3
   },
   "member_spread_deg": {
    "lat": 14.41,
    "lon": 314.26
   },
   "member_spread_now_deg": {
    "lat": 3.12,
    "lon": 2.3
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 16:34:32",
   "seed_lat": 31.41754,
   "seed_lon": -9.8375,
   "seed_alt_m": 12650.0,
   "seed_age_h": 12.76,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 23:30:00",
    "lat": 35.92126,
    "lon": -146.81296,
    "alt_m": 12494.0
   },
   "member_spread_deg": {
    "lat": 14.13,
    "lon": 314.51
   },
   "member_spread_now_deg": {
    "lat": 3.22,
    "lon": 2.5
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-30",
   "flight_id": "DG2GG-30_2026-08-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 03:21:00",
   "seed_lat": 49.54167,
   "seed_lon": 94.70833,
   "seed_alt_m": 12300.0,
   "seed_age_h": 25.98,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-05 23:45:00",
    "lat": 58.18485,
    "lon": 32.9468,
    "alt_m": 12379.5
   },
   "member_spread_deg": {
    "lat": 18.88,
    "lon": 69.28
   },
   "member_spread_now_deg": {
    "lat": 3.22,
    "lon": 6.2
   },
   "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": 15.3,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 23:30:00",
    "lat": 27.12316,
    "lon": 29.63725,
    "alt_m": 13485.1
   },
   "member_spread_deg": {
    "lat": 23.76,
    "lon": 130.16
   },
   "member_spread_now_deg": {
    "lat": 1.45,
    "lon": 2.81
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-32",
   "flight_id": "DG2GG-32_2026-09-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 13:06:00",
   "seed_lat": 49.22917,
   "seed_lon": -43.25,
   "seed_alt_m": 13080.0,
   "seed_age_h": 16.23,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 23:30:00",
    "lat": 57.30706,
    "lon": 92.20364,
    "alt_m": 13121.2
   },
   "member_spread_deg": {
    "lat": 34.11,
    "lon": 58.64
   },
   "member_spread_now_deg": {
    "lat": 8.39,
    "lon": 4.83
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 00:05:00",
   "seed_lat": 32.875,
   "seed_lon": -134.54167,
   "seed_alt_m": 13430.0,
   "seed_age_h": 5.25,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 23:30:00",
    "lat": 26.58646,
    "lon": -66.18812,
    "alt_m": 13670.1
   },
   "member_spread_deg": {
    "lat": 46.63,
    "lon": 100.9
   },
   "member_spread_now_deg": {
    "lat": 1.16,
    "lon": 2.76
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-36",
   "flight_id": "DG2GG-36_2026-09-26",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 13:20:00",
   "seed_lat": 37.95833,
   "seed_lon": 26.0,
   "seed_alt_m": 13150.0,
   "seed_age_h": 16.0,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 23:45:00",
    "lat": 42.76861,
    "lon": -132.15339,
    "alt_m": 13266.3
   },
   "member_spread_deg": {
    "lat": 22.1,
    "lon": 52.17
   },
   "member_spread_now_deg": {
    "lat": 1.67,
    "lon": 11.58
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DH1PR-578",
   "flight_id": "DH1PR-578_2026-09-27",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 16:45:47",
   "seed_lat": 40.125,
   "seed_lon": 15.95833,
   "seed_alt_m": 11650.0,
   "seed_age_h": 12.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-05 23:45:00",
    "lat": 43.64369,
    "lon": -166.62119,
    "alt_m": 11376.8
   },
   "member_spread_deg": {
    "lat": 12.34,
    "lon": 47.55
   },
   "member_spread_now_deg": {
    "lat": 1.26,
    "lon": 2.38
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DH1PR-578e",
   "flight_id": "DH1PR-578e_2026-09-27",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 16:46:32",
   "seed_lat": 40.13889,
   "seed_lon": 15.95504,
   "seed_alt_m": 11650.0,
   "seed_age_h": 12.56,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-05 23:45:00",
    "lat": 43.63132,
    "lon": -166.65953,
    "alt_m": 11377.1
   },
   "member_spread_deg": {
    "lat": 12.35,
    "lon": 47.4
   },
   "member_spread_now_deg": {
    "lat": 1.26,
    "lon": 2.37
   },
   "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": 256.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 23:45:00",
    "lat": 12.6328,
    "lon": -55.37166,
    "alt_m": 15340.3
   },
   "member_spread_deg": {
    "lat": 40.8,
    "lon": 253.26
   },
   "member_spread_now_deg": {
    "lat": 49.76,
    "lon": 122.49
   },
   "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": 261.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 23:30:00",
    "lat": 77.71674,
    "lon": 59.21191,
    "alt_m": 13969.5
   },
   "member_spread_deg": {
    "lat": 29.85,
    "lon": 76.4
   },
   "member_spread_now_deg": {
    "lat": 17.21,
    "lon": 85.67
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "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": 232.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-05 23:45:00",
    "lat": 20.79872,
    "lon": -40.021,
    "alt_m": 14336.3
   },
   "member_spread_deg": {
    "lat": 42.98,
    "lon": 220.71
   },
   "member_spread_now_deg": {
    "lat": 57.06,
    "lon": 320.38
   },
   "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": 57.64,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 23:45:00",
    "lat": 47.15765,
    "lon": 81.17466,
    "alt_m": 14171.7
   },
   "member_spread_deg": {
    "lat": 18.58,
    "lon": 107.11
   },
   "member_spread_now_deg": {
    "lat": 23.87,
    "lon": 46.52
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 14:33:00",
   "seed_lat": 45.1875,
   "seed_lon": 13.41667,
   "seed_alt_m": 13410.0,
   "seed_age_h": 14.78,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 23:30:00",
    "lat": 48.13113,
    "lon": 168.40165,
    "alt_m": 12952.0
   },
   "member_spread_deg": {
    "lat": 9.61,
    "lon": 357.19
   },
   "member_spread_now_deg": {
    "lat": 1.53,
    "lon": 1.18
   },
   "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": 318.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-05 23:45:00",
    "lat": 32.58004,
    "lon": -173.35169,
    "alt_m": 13825.9
   },
   "member_spread_deg": {
    "lat": 37.38,
    "lon": 350.29
   },
   "member_spread_now_deg": {
    "lat": 28.84,
    "lon": 210.36
   },
   "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": 216.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 23:30:00",
    "lat": 34.58437,
    "lon": 23.51343,
    "alt_m": 13090.7
   },
   "member_spread_deg": {
    "lat": 27.51,
    "lon": 295.09
   },
   "member_spread_now_deg": {
    "lat": 23.04,
    "lon": 169.44
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KI6DS-11",
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   "display_as": "track",
   "display_reason": "fresh"
  }
 ]
}