{
 "generated_utc": "2026-09-22T23:27:40Z",
 "gfs_cycle_utc": "2026-09-22T18:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 468.0,
  "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_20260922_18Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260922_18Z.geojson.gz"
 },
 "counts": {
  "flights": 49,
  "members": 9,
  "rows": 203985
 },
 "flights": [
  {
   "callsign": "AE4ZZ-22",
   "flight_id": "AE4ZZ-22_2026-09-19",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 17:22:03",
   "seed_lat": 39.99996,
   "seed_lon": -51.95829,
   "seed_alt_m": 13590.0,
   "seed_age_h": 5.97,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 17:45:00",
    "lat": 37.33504,
    "lon": 62.26231,
    "alt_m": 13239.5
   },
   "member_spread_deg": {
    "lat": 16.2,
    "lon": 126.91
   },
   "member_spread_now_deg": {
    "lat": 0.71,
    "lon": 1.16
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AE4ZZ-23",
   "flight_id": "AE4ZZ-23_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 19:51:41",
   "seed_lat": 39.60414,
   "seed_lon": -71.45829,
   "seed_alt_m": 13450.0,
   "seed_age_h": 3.47,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 19:15:00",
    "lat": 36.29763,
    "lon": 65.13959,
    "alt_m": 13145.5
   },
   "member_spread_deg": {
    "lat": 31.24,
    "lon": 150.84
   },
   "member_spread_now_deg": {
    "lat": 1.44,
    "lon": 2.97
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 15:48:40",
   "seed_lat": -55.8125,
   "seed_lon": 20.16668,
   "seed_alt_m": 12090.0,
   "seed_age_h": 7.52,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-29 17:45:00",
    "lat": -72.54202,
    "lon": 52.848,
    "alt_m": 12132.3
   },
   "member_spread_deg": {
    "lat": 10.1,
    "lon": 266.15
   },
   "member_spread_now_deg": {
    "lat": 1.15,
    "lon": 2.0
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 20:32:03",
   "seed_lat": 23.95833,
   "seed_lon": 168.58333,
   "seed_alt_m": 13810.0,
   "seed_age_h": 2.8,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-29 20:00:00",
    "lat": 26.92955,
    "lon": -136.52437,
    "alt_m": 13760.7
   },
   "member_spread_deg": {
    "lat": 16.52,
    "lon": 305.33
   },
   "member_spread_now_deg": {
    "lat": 0.72,
    "lon": 1.09
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 22:59:17",
   "seed_lat": 47.08333,
   "seed_lon": -163.79167,
   "seed_alt_m": 12780.0,
   "seed_age_h": 0.35,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 23:00:00",
    "lat": 40.24858,
    "lon": -64.67061,
    "alt_m": 12948.9
   },
   "member_spread_deg": {
    "lat": 26.21,
    "lon": 117.94
   },
   "member_spread_now_deg": {
    "lat": 0.17,
    "lon": 0.3
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 12:41:04",
   "seed_lat": 48.52083,
   "seed_lon": 62.16667,
   "seed_alt_m": 13920.0,
   "seed_age_h": 10.65,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-29 17:45:00",
    "lat": 57.6958,
    "lon": -92.10508,
    "alt_m": 13501.8
   },
   "member_spread_deg": {
    "lat": 9.56,
    "lon": 86.89
   },
   "member_spread_now_deg": {
    "lat": 1.19,
    "lon": 0.58
   },
   "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": 63.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-29 17:30:00",
    "lat": 43.63542,
    "lon": 176.48653,
    "alt_m": 11451.1
   },
   "member_spread_deg": {
    "lat": 40.05,
    "lon": 334.17
   },
   "member_spread_now_deg": {
    "lat": 18.41,
    "lon": 50.77
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 22:54:01",
   "seed_lat": 52.6875,
   "seed_lon": -173.625,
   "seed_alt_m": 11940.0,
   "seed_age_h": 0.43,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-29 23:00:00",
    "lat": 49.54413,
    "lon": -44.75164,
    "alt_m": 12282.0
   },
   "member_spread_deg": {
    "lat": 26.74,
    "lon": 162.73
   },
   "member_spread_now_deg": {
    "lat": 0.08,
    "lon": 0.14
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 22:55:32",
   "seed_lat": 52.69236,
   "seed_lon": -173.64167,
   "seed_alt_m": 11940.0,
   "seed_age_h": 0.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-29 23:00:00",
    "lat": 49.50753,
    "lon": -44.71406,
    "alt_m": 12283.0
   },
   "member_spread_deg": {
    "lat": 26.64,
    "lon": 163.23
   },
   "member_spread_now_deg": {
    "lat": 0.08,
    "lon": 0.14
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-30",
   "flight_id": "DG2GG-30_2026-08-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 07:06:00",
   "seed_lat": 62.91667,
   "seed_lon": 23.0,
   "seed_alt_m": 11970.0,
   "seed_age_h": 40.23,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-29 17:30:00",
    "lat": 51.19375,
    "lon": 155.47819,
    "alt_m": 12523.6
   },
   "member_spread_deg": {
    "lat": 15.06,
    "lon": 126.9
   },
   "member_spread_now_deg": {
    "lat": 12.77,
    "lon": 3.66
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-31",
   "flight_id": "DG2GG-31_2026-08-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 08:37:00",
   "seed_lat": 39.85417,
   "seed_lon": 100.41667,
   "seed_alt_m": 13220.0,
   "seed_age_h": 14.72,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 17:30:00",
    "lat": 37.6711,
    "lon": -64.22281,
    "alt_m": 13345.8
   },
   "member_spread_deg": {
    "lat": 34.29,
    "lon": 84.07
   },
   "member_spread_now_deg": {
    "lat": 0.93,
    "lon": 7.06
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-32",
   "flight_id": "DG2GG-32_2026-09-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 06:46:00",
   "seed_lat": 43.77083,
   "seed_lon": 101.5,
   "seed_alt_m": 13410.0,
   "seed_age_h": 16.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 17:45:00",
    "lat": 48.76798,
    "lon": -12.51857,
    "alt_m": 12889.3
   },
   "member_spread_deg": {
    "lat": 16.51,
    "lon": 144.07
   },
   "member_spread_now_deg": {
    "lat": 2.34,
    "lon": 4.33
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 22:05:00",
   "seed_lat": 26.3125,
   "seed_lon": 168.5,
   "seed_alt_m": 13500.0,
   "seed_age_h": 1.25,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 21:30:00",
    "lat": 36.53282,
    "lon": -104.636,
    "alt_m": 13356.9
   },
   "member_spread_deg": {
    "lat": 34.74,
    "lon": 286.57
   },
   "member_spread_now_deg": {
    "lat": 0.21,
    "lon": 0.38
   },
   "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": 106.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 17:45:00",
    "lat": 11.78015,
    "lon": -43.51641,
    "alt_m": 15276.8
   },
   "member_spread_deg": {
    "lat": 48.34,
    "lon": 157.32
   },
   "member_spread_now_deg": {
    "lat": 15.32,
    "lon": 28.45
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "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": 111.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 17:30:00",
    "lat": 64.95524,
    "lon": -67.4969,
    "alt_m": 14037.0
   },
   "member_spread_deg": {
    "lat": 14.73,
    "lon": 78.98
   },
   "member_spread_now_deg": {
    "lat": 2.51,
    "lon": 42.15
   },
   "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": 82.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-29 17:45:00",
    "lat": 27.61139,
    "lon": -167.86033,
    "alt_m": 14233.5
   },
   "member_spread_deg": {
    "lat": 59.36,
    "lon": 120.39
   },
   "member_spread_now_deg": {
    "lat": 12.89,
    "lon": 351.08
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DO3GU-8",
   "flight_id": "DO3GU-8_2026-08-12",
   "payload_type": "APRS",
   "seed_time": "2026-09-18 08:14:06",
   "seed_lat": 42.27058,
   "seed_lon": 26.24284,
   "seed_alt_m": 14576.0,
   "seed_age_h": 111.1,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 17:45:00",
    "lat": 51.15645,
    "lon": -33.9239,
    "alt_m": 14223.7
   },
   "member_spread_deg": {
    "lat": 31.9,
    "lon": 117.47
   },
   "member_spread_now_deg": {
    "lat": 3.16,
    "lon": 39.19
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 21:38:00",
   "seed_lat": 36.0625,
   "seed_lon": -83.04167,
   "seed_alt_m": 13520.0,
   "seed_age_h": 1.7,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 21:15:00",
    "lat": 42.22068,
    "lon": 45.0811,
    "alt_m": 13204.4
   },
   "member_spread_deg": {
    "lat": 38.35,
    "lon": 151.71
   },
   "member_spread_now_deg": {
    "lat": 0.69,
    "lon": 0.56
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "I1RFQ",
   "flight_id": "I1RFQ_2026-09-06",
   "payload_type": "WSPR",
   "seed_time": "2026-09-10 05:25:00",
   "seed_lat": 48.52083,
   "seed_lon": 159.54167,
   "seed_alt_m": 12130.0,
   "seed_age_h": 305.92,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-29 17:30:00",
    "lat": 25.08848,
    "lon": -49.59203,
    "alt_m": 12782.1
   },
   "member_spread_deg": {
    "lat": 52.05,
    "lon": 186.05
   },
   "member_spread_now_deg": {
    "lat": 45.14,
    "lon": 219.34
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "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": 168.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 17:45:00",
    "lat": 22.75966,
    "lon": 17.83264,
    "alt_m": 13807.6
   },
   "member_spread_deg": {
    "lat": 27.81,
    "lon": 233.44
   },
   "member_spread_now_deg": {
    "lat": 26.83,
    "lon": 95.46
   },
   "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": 66.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 17:30:00",
    "lat": 42.5529,
    "lon": -10.39801,
    "alt_m": 12944.0
   },
   "member_spread_deg": {
    "lat": 12.81,
    "lon": 53.89
   },
   "member_spread_now_deg": {
    "lat": 9.62,
    "lon": 37.37
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 257.25,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 17:30:00",
    "lat": 48.43434,
    "lon": -112.73438,
    "alt_m": 12433.5
   },
   "member_spread_deg": {
    "lat": 23.93,
    "lon": 311.03
   },
   "member_spread_now_deg": {
    "lat": 41.28,
    "lon": 182.23
   },
   "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": 226.32,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 17:30:00",
    "lat": 45.00495,
    "lon": 105.71883,
    "alt_m": 12495.9
   },
   "member_spread_deg": {
    "lat": 49.59,
    "lon": 318.6
   },
   "member_spread_now_deg": {
    "lat": 35.41,
    "lon": 105.67
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KI6DS-11",
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  }
 ]
}