{
 "generated_utc": "2026-09-23T11:27:50Z",
 "gfs_cycle_utc": "2026-09-23T06:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 480.0,
  "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_20260923_06Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260923_06Z.geojson.gz"
 },
 "counts": {
  "flights": 49,
  "members": 9,
  "rows": 209142
 },
 "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": 17.97,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 05:45:00",
    "lat": 34.02078,
    "lon": 65.30097,
    "alt_m": 13361.7
   },
   "member_spread_deg": {
    "lat": 23.78,
    "lon": 357.62
   },
   "member_spread_now_deg": {
    "lat": 3.19,
    "lon": 4.93
   },
   "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": 15.47,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 05:45:00",
    "lat": 51.03926,
    "lon": 35.35004,
    "alt_m": 12959.6
   },
   "member_spread_deg": {
    "lat": 28.95,
    "lon": 116.55
   },
   "member_spread_now_deg": {
    "lat": 2.09,
    "lon": 12.94
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 09:58:40",
   "seed_lat": -67.77083,
   "seed_lon": 60.37501,
   "seed_alt_m": 12360.0,
   "seed_age_h": 1.36,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 09:30:00",
    "lat": -68.58872,
    "lon": -10.65548,
    "alt_m": 12221.0
   },
   "member_spread_deg": {
    "lat": 13.26,
    "lon": 89.29
   },
   "member_spread_now_deg": {
    "lat": 0.35,
    "lon": 0.87
   },
   "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": 14.8,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-30 05:30:00",
    "lat": 29.29179,
    "lon": -136.07962,
    "alt_m": 13708.5
   },
   "member_spread_deg": {
    "lat": 24.9,
    "lon": 306.65
   },
   "member_spread_now_deg": {
    "lat": 5.25,
    "lon": 7.2
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 03:20:18",
   "seed_lat": 44.35417,
   "seed_lon": -157.625,
   "seed_alt_m": 12950.0,
   "seed_age_h": 8.0,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 05:45:00",
    "lat": 41.76648,
    "lon": 8.54414,
    "alt_m": 13215.3
   },
   "member_spread_deg": {
    "lat": 14.69,
    "lon": 107.74
   },
   "member_spread_now_deg": {
    "lat": 1.3,
    "lon": 3.77
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 10:36:18",
   "seed_lat": 44.4375,
   "seed_lon": 73.16667,
   "seed_alt_m": 13890.0,
   "seed_age_h": 0.73,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-30 10:00:00",
    "lat": 57.7909,
    "lon": -73.92767,
    "alt_m": 13517.9
   },
   "member_spread_deg": {
    "lat": 32.57,
    "lon": 81.2
   },
   "member_spread_now_deg": {
    "lat": 0.05,
    "lon": 0.1
   },
   "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": 75.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-30 05:30:00",
    "lat": 42.84004,
    "lon": 165.7144,
    "alt_m": 11410.3
   },
   "member_spread_deg": {
    "lat": 27.74,
    "lon": 291.9
   },
   "member_spread_now_deg": {
    "lat": 19.23,
    "lon": 61.48
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 02:33:46",
   "seed_lat": 50.125,
   "seed_lon": -166.08333,
   "seed_alt_m": 11920.0,
   "seed_age_h": 8.77,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-30 05:30:00",
    "lat": 30.39821,
    "lon": 16.79685,
    "alt_m": 12527.9
   },
   "member_spread_deg": {
    "lat": 32.2,
    "lon": 99.61
   },
   "member_spread_now_deg": {
    "lat": 1.8,
    "lon": 3.68
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 02:34:32",
   "seed_lat": 50.11823,
   "seed_lon": -166.07778,
   "seed_alt_m": 11920.0,
   "seed_age_h": 8.76,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-30 05:30:00",
    "lat": 24.28922,
    "lon": 0.8594,
    "alt_m": 12525.5
   },
   "member_spread_deg": {
    "lat": 35.6,
    "lon": 109.71
   },
   "member_spread_now_deg": {
    "lat": 1.8,
    "lon": 3.69
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-30",
   "flight_id": "DG2GG-30_2026-08-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 10:01:00",
   "seed_lat": 41.41667,
   "seed_lon": 22.08333,
   "seed_alt_m": 12490.0,
   "seed_age_h": 1.32,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 09:30:00",
    "lat": 47.01131,
    "lon": -160.81666,
    "alt_m": 12758.6
   },
   "member_spread_deg": {
    "lat": 13.78,
    "lon": 318.06
   },
   "member_spread_now_deg": {
    "lat": 0.55,
    "lon": 0.64
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-31",
   "flight_id": "DG2GG-31_2026-08-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 03:12:00",
   "seed_lat": 40.39583,
   "seed_lon": 128.04167,
   "seed_alt_m": 13150.0,
   "seed_age_h": 8.13,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 05:45:00",
    "lat": 46.86243,
    "lon": -43.62076,
    "alt_m": 13398.0
   },
   "member_spread_deg": {
    "lat": 46.79,
    "lon": 102.81
   },
   "member_spread_now_deg": {
    "lat": 1.47,
    "lon": 2.71
   },
   "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": 28.57,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 05:45:00",
    "lat": 64.99835,
    "lon": -39.83775,
    "alt_m": 12578.2
   },
   "member_spread_deg": {
    "lat": 13.95,
    "lon": 69.4
   },
   "member_spread_now_deg": {
    "lat": 4.35,
    "lon": 13.41
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 04:20:00",
   "seed_lat": 24.25,
   "seed_lon": 164.375,
   "seed_alt_m": 13520.0,
   "seed_age_h": 7.0,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 05:45:00",
    "lat": 40.33919,
    "lon": -117.84216,
    "alt_m": 13456.6
   },
   "member_spread_deg": {
    "lat": 33.46,
    "lon": 307.4
   },
   "member_spread_now_deg": {
    "lat": 1.34,
    "lon": 1.12
   },
   "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": 118.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 05:45:00",
    "lat": 3.73888,
    "lon": -36.13147,
    "alt_m": 15269.0
   },
   "member_spread_deg": {
    "lat": 55.03,
    "lon": 115.85
   },
   "member_spread_now_deg": {
    "lat": 22.09,
    "lon": 36.78
   },
   "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": 123.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 05:30:00",
    "lat": 50.22567,
    "lon": -20.85344,
    "alt_m": 14400.9
   },
   "member_spread_deg": {
    "lat": 39.07,
    "lon": 72.74
   },
   "member_spread_now_deg": {
    "lat": 6.67,
    "lon": 46.16
   },
   "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": 94.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-30 05:45:00",
    "lat": 36.5505,
    "lon": -113.68929,
    "alt_m": 14097.5
   },
   "member_spread_deg": {
    "lat": 52.86,
    "lon": 307.59
   },
   "member_spread_now_deg": {
    "lat": 21.44,
    "lon": 354.44
   },
   "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": 123.1,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 05:45:00",
    "lat": 43.23618,
    "lon": -26.32706,
    "alt_m": 14463.9
   },
   "member_spread_deg": {
    "lat": 26.9,
    "lon": 124.82
   },
   "member_spread_now_deg": {
    "lat": 2.8,
    "lon": 52.36
   },
   "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": 13.7,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 05:45:00",
    "lat": 41.50817,
    "lon": 69.67024,
    "alt_m": 13227.5
   },
   "member_spread_deg": {
    "lat": 20.3,
    "lon": 167.38
   },
   "member_spread_now_deg": {
    "lat": 5.32,
    "lon": 10.99
   },
   "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": 317.92,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-30 05:30:00",
    "lat": 24.30165,
    "lon": -6.83847,
    "alt_m": 12726.5
   },
   "member_spread_deg": {
    "lat": 61.71,
    "lon": 256.93
   },
   "member_spread_now_deg": {
    "lat": 44.49,
    "lon": 246.36
   },
   "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": 180.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 05:45:00",
    "lat": 24.81441,
    "lon": 29.37353,
    "alt_m": 13759.9
   },
   "member_spread_deg": {
    "lat": 30.9,
    "lon": 332.16
   },
   "member_spread_now_deg": {
    "lat": 18.12,
    "lon": 94.13
   },
   "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": 78.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 05:30:00",
    "lat": 36.38347,
    "lon": -21.73348,
    "alt_m": 13137.9
   },
   "member_spread_deg": {
    "lat": 37.68,
    "lon": 190.05
   },
   "member_spread_now_deg": {
    "lat": 10.69,
    "lon": 39.17
   },
   "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": 269.25,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 05:30:00",
    "lat": 60.74783,
    "lon": -105.25489,
    "alt_m": 12301.1
   },
   "member_spread_deg": {
    "lat": 35.13,
    "lon": 294.28
   },
   "member_spread_now_deg": {
    "lat": 42.4,
    "lon": 183.89
   },
   "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": 238.32,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 05:30:00",
    "lat": 41.85329,
    "lon": 118.46681,
    "alt_m": 12359.0
   },
   "member_spread_deg": {
    "lat": 53.53,
    "lon": 286.93
   },
   "member_spread_now_deg": {
    "lat": 35.26,
    "lon": 145.01
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
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  }
 ]
}