{
 "generated_utc": "2026-09-25T23:27:49Z",
 "gfs_cycle_utc": "2026-09-25T18:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 491.5,
  "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_18Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260925_18Z.geojson.gz"
 },
 "counts": {
  "flights": 48,
  "members": 9,
  "rows": 212229
 },
 "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": 55.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 17:45:00",
    "lat": 47.83495,
    "lon": 155.36453,
    "alt_m": 12758.0
   },
   "member_spread_deg": {
    "lat": 19.22,
    "lon": 336.36
   },
   "member_spread_now_deg": {
    "lat": 38.64,
    "lon": 26.44
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AE4ZZ-23",
   "flight_id": "AE4ZZ-23_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 14:53:20",
   "seed_lat": 48.02081,
   "seed_lon": 10.87504,
   "seed_alt_m": 13390.0,
   "seed_age_h": 8.45,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 17:30:00",
    "lat": 49.03902,
    "lon": 165.17328,
    "alt_m": 12915.3
   },
   "member_spread_deg": {
    "lat": 10.84,
    "lon": 95.02
   },
   "member_spread_now_deg": {
    "lat": 2.42,
    "lon": 1.16
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 22:53:40",
   "seed_lat": -66.0625,
   "seed_lon": -175.91666,
   "seed_alt_m": 12000.0,
   "seed_age_h": 0.44,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-02 23:00:00",
    "lat": -75.45,
    "lon": 153.85612,
    "alt_m": 12185.9
   },
   "member_spread_deg": {
    "lat": 16.73,
    "lon": 342.29
   },
   "member_spread_now_deg": {
    "lat": 0.06,
    "lon": 0.18
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 22:57:49",
   "seed_lat": 38.58333,
   "seed_lon": 172.95833,
   "seed_alt_m": 13620.0,
   "seed_age_h": 0.37,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 23:00:00",
    "lat": 37.84454,
    "lon": -33.4092,
    "alt_m": 13681.4
   },
   "member_spread_deg": {
    "lat": 47.61,
    "lon": 68.47
   },
   "member_spread_now_deg": {
    "lat": 0.07,
    "lon": 0.09
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 20:38:18",
   "seed_lat": 48.0,
   "seed_lon": -80.91667,
   "seed_alt_m": 13080.0,
   "seed_age_h": 2.7,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 20:15:00",
    "lat": 40.69592,
    "lon": 90.77162,
    "alt_m": 13075.2
   },
   "member_spread_deg": {
    "lat": 19.69,
    "lon": 108.67
   },
   "member_spread_now_deg": {
    "lat": 0.43,
    "lon": 1.34
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 22:52:18",
   "seed_lat": 44.3125,
   "seed_lon": 142.95833,
   "seed_alt_m": 13640.0,
   "seed_age_h": 0.46,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 22:15:00",
    "lat": 48.21626,
    "lon": 1.63887,
    "alt_m": 14015.5
   },
   "member_spread_deg": {
    "lat": 25.89,
    "lon": 140.41
   },
   "member_spread_now_deg": {
    "lat": 0.03,
    "lon": 0.25
   },
   "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": 135.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-02 17:30:00",
    "lat": 43.1144,
    "lon": -149.30607,
    "alt_m": 11475.0
   },
   "member_spread_deg": {
    "lat": 57.46,
    "lon": 225.58
   },
   "member_spread_now_deg": {
    "lat": 13.69,
    "lon": 124.04
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 21:03:46",
   "seed_lat": 46.58333,
   "seed_lon": -81.25,
   "seed_alt_m": 12320.0,
   "seed_age_h": 2.27,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-02 20:30:00",
    "lat": 40.20241,
    "lon": 91.94204,
    "alt_m": 12319.2
   },
   "member_spread_deg": {
    "lat": 12.28,
    "lon": 75.81
   },
   "member_spread_now_deg": {
    "lat": 0.49,
    "lon": 0.85
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 20:34:32",
   "seed_lat": 46.65512,
   "seed_lon": -81.43229,
   "seed_alt_m": 12330.0,
   "seed_age_h": 2.76,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 20:00:00",
    "lat": 40.20663,
    "lon": 91.49865,
    "alt_m": 12337.8
   },
   "member_spread_deg": {
    "lat": 11.93,
    "lon": 109.66
   },
   "member_spread_now_deg": {
    "lat": 0.5,
    "lon": 1.05
   },
   "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": 57.98,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 17:45:00",
    "lat": 45.28778,
    "lon": -128.65025,
    "alt_m": 12900.4
   },
   "member_spread_deg": {
    "lat": 11.06,
    "lon": 302.24
   },
   "member_spread_now_deg": {
    "lat": 18.44,
    "lon": 9.67
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-31",
   "flight_id": "DG2GG-31_2026-08-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 22:37:00",
   "seed_lat": 31.125,
   "seed_lon": -132.54167,
   "seed_alt_m": 13420.0,
   "seed_age_h": 0.72,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 22:00:00",
    "lat": 26.09179,
    "lon": -29.04355,
    "alt_m": 13645.8
   },
   "member_spread_deg": {
    "lat": 52.16,
    "lon": 117.17
   },
   "member_spread_now_deg": {
    "lat": 0.12,
    "lon": 0.03
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-32",
   "flight_id": "DG2GG-32_2026-09-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 19:41:00",
   "seed_lat": 53.8125,
   "seed_lon": -132.08333,
   "seed_alt_m": 12890.0,
   "seed_age_h": 3.65,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 19:15:00",
    "lat": 45.74841,
    "lon": 23.84714,
    "alt_m": 13578.6
   },
   "member_spread_deg": {
    "lat": 32.69,
    "lon": 95.95
   },
   "member_spread_now_deg": {
    "lat": 1.04,
    "lon": 0.57
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 22:35:00",
   "seed_lat": 37.79167,
   "seed_lon": 173.04167,
   "seed_alt_m": 13400.0,
   "seed_age_h": 0.75,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 22:00:00",
    "lat": 27.99999,
    "lon": -70.8259,
    "alt_m": 13704.5
   },
   "member_spread_deg": {
    "lat": 44.44,
    "lon": 49.83
   },
   "member_spread_now_deg": {
    "lat": 0.09,
    "lon": 0.11
   },
   "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": 178.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 17:45:00",
    "lat": -5.95679,
    "lon": -24.6883,
    "alt_m": 15272.0
   },
   "member_spread_deg": {
    "lat": 60.85,
    "lon": 313.99
   },
   "member_spread_now_deg": {
    "lat": 46.41,
    "lon": 78.35
   },
   "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": 183.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 17:30:00",
    "lat": 71.2142,
    "lon": -10.34095,
    "alt_m": 14152.7
   },
   "member_spread_deg": {
    "lat": 29.67,
    "lon": 61.43
   },
   "member_spread_now_deg": {
    "lat": 10.95,
    "lon": 40.39
   },
   "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": 154.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-02 17:45:00",
    "lat": 1.08052,
    "lon": -92.04163,
    "alt_m": 14455.4
   },
   "member_spread_deg": {
    "lat": 59.67,
    "lon": 335.73
   },
   "member_spread_now_deg": {
    "lat": 37.06,
    "lon": 353.19
   },
   "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": 44.57,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-02 17:45:00",
    "lat": 67.59209,
    "lon": -2.89936,
    "alt_m": 13699.3
   },
   "member_spread_deg": {
    "lat": 17.07,
    "lon": 15.53
   },
   "member_spread_now_deg": {
    "lat": 5.48,
    "lon": 17.28
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 17:03:00",
   "seed_lat": 40.33333,
   "seed_lon": -18.0,
   "seed_alt_m": 13550.0,
   "seed_age_h": 6.28,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 17:30:00",
    "lat": 41.71951,
    "lon": 76.78625,
    "alt_m": 13319.6
   },
   "member_spread_deg": {
    "lat": 14.2,
    "lon": 101.9
   },
   "member_spread_now_deg": {
    "lat": 0.74,
    "lon": 2.22
   },
   "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": 240.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-02 17:45:00",
    "lat": 24.12077,
    "lon": 63.61929,
    "alt_m": 13779.1
   },
   "member_spread_deg": {
    "lat": 32.85,
    "lon": 192.53
   },
   "member_spread_now_deg": {
    "lat": 47.91,
    "lon": 109.27
   },
   "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": 138.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 17:30:00",
    "lat": 30.88807,
    "lon": 24.62573,
    "alt_m": 13117.4
   },
   "member_spread_deg": {
    "lat": 26.59,
    "lon": 207.23
   },
   "member_spread_now_deg": {
    "lat": 27.45,
    "lon": 74.22
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "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": 329.25,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 17:30:00",
    "lat": 38.87301,
    "lon": -31.76306,
    "alt_m": 12999.2
   },
   "member_spread_deg": {
    "lat": 51.78,
    "lon": 303.29
   },
   "member_spread_now_deg": {
    "lat": 23.8,
    "lon": 242.38
   },
   "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": 298.32,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 17:30:00",
    "lat": 51.41482,
    "lon": 89.89521,
    "alt_m": 12531.1
   },
   "member_spread_deg": {
    "lat": 46.5,
    "lon": 350.89
   },
   "member_spread_now_deg": {
    "lat": 25.72,
    "lon": 187.36
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 18:45:45",
   "seed_lat": 71.97911,
   "seed_lon": -68.08331,
   "seed_alt_m": 12900.0,
   "seed_age_h": 4.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 18:15:00",
    "lat": 84.82663,
    "lon": -8.24633,
    "alt_m": 12945.1
   },
   "member_spread_deg": {
    "lat": 39.28,
    "lon": 224.83
   },
   "member_spread_now_deg": {
    "lat": 1.55,
    "lon": 1.33
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
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}