{
 "generated_utc": "2026-09-24T23:27:34Z",
 "gfs_cycle_utc": "2026-09-24T18:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 467.5,
  "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_20260924_18Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260924_18Z.geojson.gz"
 },
 "counts": {
  "flights": 49,
  "members": 9,
  "rows": 207414
 },
 "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": 31.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 17:45:00",
    "lat": 41.68262,
    "lon": 107.30598,
    "alt_m": 13066.5
   },
   "member_spread_deg": {
    "lat": 21.89,
    "lon": 99.65
   },
   "member_spread_now_deg": {
    "lat": 15.12,
    "lon": 5.02
   },
   "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": 8.92,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 17:30:00",
    "lat": 38.91175,
    "lon": 113.58723,
    "alt_m": 13044.0
   },
   "member_spread_deg": {
    "lat": 14.6,
    "lon": 123.93
   },
   "member_spread_now_deg": {
    "lat": 2.21,
    "lon": 4.28
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 06:33:40",
   "seed_lat": -67.875,
   "seed_lon": 100.87501,
   "seed_alt_m": 12210.0,
   "seed_age_h": 16.77,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-01 17:30:00",
    "lat": -68.28762,
    "lon": 78.5575,
    "alt_m": 12030.7
   },
   "member_spread_deg": {
    "lat": 21.62,
    "lon": 95.88
   },
   "member_spread_now_deg": {
    "lat": 12.6,
    "lon": 7.6
   },
   "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": 31.68,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 17:45:00",
    "lat": 20.88368,
    "lon": -63.01492,
    "alt_m": 15891.4
   },
   "member_spread_deg": {
    "lat": 24.04,
    "lon": 116.4
   },
   "member_spread_now_deg": {
    "lat": 15.17,
    "lon": 15.14
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 22:59:04",
   "seed_lat": 30.95833,
   "seed_lon": 164.45833,
   "seed_alt_m": 13705.0,
   "seed_age_h": 0.35,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 23:00:00",
    "lat": 17.83586,
    "lon": -85.07965,
    "alt_m": 13775.8
   },
   "member_spread_deg": {
    "lat": 48.38,
    "lon": 32.76
   },
   "member_spread_now_deg": {
    "lat": 0.11,
    "lon": 0.09
   },
   "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": 1.72,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 21:00:00",
    "lat": 37.81862,
    "lon": 62.1398,
    "alt_m": 13178.5
   },
   "member_spread_deg": {
    "lat": 22.95,
    "lon": 56.23
   },
   "member_spread_now_deg": {
    "lat": 0.64,
    "lon": 0.44
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 10:39:47",
   "seed_lat": 44.625,
   "seed_lon": 92.58333,
   "seed_alt_m": 13790.0,
   "seed_age_h": 12.67,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-01 17:45:00",
    "lat": 56.01728,
    "lon": -27.3886,
    "alt_m": 13455.6
   },
   "member_spread_deg": {
    "lat": 23.97,
    "lon": 111.57
   },
   "member_spread_now_deg": {
    "lat": 0.26,
    "lon": 2.82
   },
   "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": 111.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-01 17:30:00",
    "lat": 42.25554,
    "lon": -120.44707,
    "alt_m": 11439.7
   },
   "member_spread_deg": {
    "lat": 66.48,
    "lon": 268.59
   },
   "member_spread_now_deg": {
    "lat": 21.12,
    "lon": 94.12
   },
   "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": 1.43,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 21:30:00",
    "lat": 46.08682,
    "lon": 69.11686,
    "alt_m": 12056.3
   },
   "member_spread_deg": {
    "lat": 33.5,
    "lon": 131.94
   },
   "member_spread_now_deg": {
    "lat": 0.71,
    "lon": 0.65
   },
   "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": 1.76,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 21:00:00",
    "lat": 46.56701,
    "lon": 70.56117,
    "alt_m": 12061.4
   },
   "member_spread_deg": {
    "lat": 27.55,
    "lon": 99.1
   },
   "member_spread_now_deg": {
    "lat": 0.96,
    "lon": 0.89
   },
   "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": 33.98,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 17:45:00",
    "lat": 39.53731,
    "lon": -172.4982,
    "alt_m": 12948.2
   },
   "member_spread_deg": {
    "lat": 16.83,
    "lon": 350.12
   },
   "member_spread_now_deg": {
    "lat": 6.77,
    "lon": 14.14
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-31",
   "flight_id": "DG2GG-31_2026-08-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 21:57:00",
   "seed_lat": 43.60417,
   "seed_lon": -142.875,
   "seed_alt_m": 13120.0,
   "seed_age_h": 1.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 21:30:00",
    "lat": 31.31469,
    "lon": -53.05975,
    "alt_m": 13667.9
   },
   "member_spread_deg": {
    "lat": 35.36,
    "lon": 95.1
   },
   "member_spread_now_deg": {
    "lat": 0.18,
    "lon": 1.0
   },
   "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": 1.9,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 21:00:00",
    "lat": 50.58362,
    "lon": 40.88386,
    "alt_m": 13349.0
   },
   "member_spread_deg": {
    "lat": 20.42,
    "lon": 89.85
   },
   "member_spread_now_deg": {
    "lat": 0.12,
    "lon": 0.45
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 22:40:00",
   "seed_lat": 25.47917,
   "seed_lon": 162.5,
   "seed_alt_m": 13510.0,
   "seed_age_h": 0.67,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 22:15:00",
    "lat": 39.00964,
    "lon": -74.26058,
    "alt_m": 13676.6
   },
   "member_spread_deg": {
    "lat": 44.41,
    "lon": 78.93
   },
   "member_spread_now_deg": {
    "lat": 0.12,
    "lon": 0.17
   },
   "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": 154.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 17:45:00",
    "lat": -2.71954,
    "lon": -31.46204,
    "alt_m": 15307.8
   },
   "member_spread_deg": {
    "lat": 51.79,
    "lon": 217.25
   },
   "member_spread_now_deg": {
    "lat": 46.86,
    "lon": 80.73
   },
   "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": 159.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 17:30:00",
    "lat": 53.01969,
    "lon": -9.17605,
    "alt_m": 14298.1
   },
   "member_spread_deg": {
    "lat": 15.27,
    "lon": 53.1
   },
   "member_spread_now_deg": {
    "lat": 11.33,
    "lon": 357.35
   },
   "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": 130.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-01 17:45:00",
    "lat": 6.85768,
    "lon": -90.07688,
    "alt_m": 14472.9
   },
   "member_spread_deg": {
    "lat": 57.18,
    "lon": 252.77
   },
   "member_spread_now_deg": {
    "lat": 38.15,
    "lon": 339.53
   },
   "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": 20.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-01 17:45:00",
    "lat": 73.55322,
    "lon": -17.86191,
    "alt_m": 13965.9
   },
   "member_spread_deg": {
    "lat": 28.64,
    "lon": 68.55
   },
   "member_spread_now_deg": {
    "lat": 2.0,
    "lon": 357.12
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "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": 5.78,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 17:30:00",
    "lat": 44.68112,
    "lon": 44.005,
    "alt_m": 13142.7
   },
   "member_spread_deg": {
    "lat": 7.84,
    "lon": 69.11
   },
   "member_spread_now_deg": {
    "lat": 2.0,
    "lon": 1.88
   },
   "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": 216.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 17:45:00",
    "lat": 16.62145,
    "lon": 3.20195,
    "alt_m": 13936.2
   },
   "member_spread_deg": {
    "lat": 37.37,
    "lon": 332.18
   },
   "member_spread_now_deg": {
    "lat": 53.9,
    "lon": 102.16
   },
   "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": 114.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 17:30:00",
    "lat": 63.6686,
    "lon": 9.72235,
    "alt_m": 13083.6
   },
   "member_spread_deg": {
    "lat": 36.27,
    "lon": 131.09
   },
   "member_spread_now_deg": {
    "lat": 23.68,
    "lon": 52.59
   },
   "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": 305.25,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 17:30:00",
    "lat": 39.39153,
    "lon": -68.59606,
    "alt_m": 12653.7
   },
   "member_spread_deg": {
    "lat": 34.08,
    "lon": 223.76
   },
   "member_spread_now_deg": {
    "lat": 34.18,
    "lon": 205.75
   },
   "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": 274.32,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 17:30:00",
    "lat": 52.13803,
    "lon": 84.61912,
    "alt_m": 12320.1
   },
   "member_spread_deg": {
    "lat": 34.62,
    "lon": 231.27
   },
   "member_spread_now_deg": {
    "lat": 30.8,
    "lon": 187.77
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KI6DS-11",
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  }
 ]
}