{
 "generated_utc": "2026-09-23T05:27:37Z",
 "gfs_cycle_utc": "2026-09-23T00:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 474.0,
  "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_00Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260923_00Z.geojson.gz"
 },
 "counts": {
  "flights": 49,
  "members": 9,
  "rows": 206496
 },
 "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": 11.97,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 23:45:00",
    "lat": 41.1286,
    "lon": 66.65023,
    "alt_m": 13184.8
   },
   "member_spread_deg": {
    "lat": 7.87,
    "lon": 126.45
   },
   "member_spread_now_deg": {
    "lat": 1.47,
    "lon": 2.34
   },
   "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": 9.47,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 23:45:00",
    "lat": 51.36172,
    "lon": 42.8997,
    "alt_m": 13087.7
   },
   "member_spread_deg": {
    "lat": 28.33,
    "lon": 325.69
   },
   "member_spread_now_deg": {
    "lat": 1.51,
    "lon": 10.8
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 04:38:40",
   "seed_lat": -64.33333,
   "seed_lon": 52.41668,
   "seed_alt_m": 12120.0,
   "seed_age_h": 0.69,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-30 04:45:00",
    "lat": -67.22708,
    "lon": -7.6351,
    "alt_m": 12233.3
   },
   "member_spread_deg": {
    "lat": 22.25,
    "lon": 111.97
   },
   "member_spread_now_deg": {
    "lat": 0.25,
    "lon": 0.36
   },
   "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": 8.8,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-29 23:30:00",
    "lat": 43.14846,
    "lon": -117.66273,
    "alt_m": 13610.6
   },
   "member_spread_deg": {
    "lat": 28.84,
    "lon": 344.03
   },
   "member_spread_now_deg": {
    "lat": 2.99,
    "lon": 3.75
   },
   "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": 2.0,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 02:45:00",
    "lat": 29.76888,
    "lon": 20.31276,
    "alt_m": 13264.2
   },
   "member_spread_deg": {
    "lat": 26.22,
    "lon": 83.6
   },
   "member_spread_now_deg": {
    "lat": 0.34,
    "lon": 0.4
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 04:20:18",
   "seed_lat": 45.47917,
   "seed_lon": 69.70833,
   "seed_alt_m": 13850.0,
   "seed_age_h": 1.0,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-30 03:45:00",
    "lat": 55.58672,
    "lon": -74.90065,
    "alt_m": 13652.0
   },
   "member_spread_deg": {
    "lat": 24.93,
    "lon": 86.82
   },
   "member_spread_now_deg": {
    "lat": 0.11,
    "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": 69.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-29 23:30:00",
    "lat": 43.57519,
    "lon": -178.91922,
    "alt_m": 11457.8
   },
   "member_spread_deg": {
    "lat": 27.15,
    "lon": 334.12
   },
   "member_spread_now_deg": {
    "lat": 20.46,
    "lon": 57.8
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 2.77,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-30 02:00:00",
    "lat": 40.47093,
    "lon": 22.43546,
    "alt_m": 12226.1
   },
   "member_spread_deg": {
    "lat": 32.86,
    "lon": 105.82
   },
   "member_spread_now_deg": {
    "lat": 0.71,
    "lon": 1.05
   },
   "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": 2.76,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-30 02:00:00",
    "lat": 40.22187,
    "lon": 21.93471,
    "alt_m": 12229.4
   },
   "member_spread_deg": {
    "lat": 32.86,
    "lon": 105.32
   },
   "member_spread_now_deg": {
    "lat": 0.71,
    "lon": 1.05
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-30",
   "flight_id": "DG2GG-30_2026-08-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 07:06:00",
   "seed_lat": 62.91667,
   "seed_lon": 23.0,
   "seed_alt_m": 11970.0,
   "seed_age_h": 46.23,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-29 23:30:00",
    "lat": 44.71093,
    "lon": 131.60279,
    "alt_m": 12305.4
   },
   "member_spread_deg": {
    "lat": 17.3,
    "lon": 100.72
   },
   "member_spread_now_deg": {
    "lat": 10.06,
    "lon": 8.84
   },
   "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": 2.13,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 02:45:00",
    "lat": 41.9006,
    "lon": -51.77251,
    "alt_m": 13469.9
   },
   "member_spread_deg": {
    "lat": 39.39,
    "lon": 99.45
   },
   "member_spread_now_deg": {
    "lat": 0.31,
    "lon": 0.43
   },
   "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": 22.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 23:45:00",
    "lat": 43.97895,
    "lon": -24.63392,
    "alt_m": 13199.0
   },
   "member_spread_deg": {
    "lat": 26.38,
    "lon": 85.59
   },
   "member_spread_now_deg": {
    "lat": 3.83,
    "lon": 7.87
   },
   "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": 1.0,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 03:45:00",
    "lat": 28.93626,
    "lon": -134.0508,
    "alt_m": 13500.5
   },
   "member_spread_deg": {
    "lat": 37.56,
    "lon": 229.18
   },
   "member_spread_now_deg": {
    "lat": 0.12,
    "lon": 0.18
   },
   "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": 112.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 23:45:00",
    "lat": 3.4233,
    "lon": -46.59851,
    "alt_m": 15309.4
   },
   "member_spread_deg": {
    "lat": 55.68,
    "lon": 140.71
   },
   "member_spread_now_deg": {
    "lat": 18.45,
    "lon": 32.23
   },
   "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": 117.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 23:30:00",
    "lat": 70.9561,
    "lon": -14.81727,
    "alt_m": 13941.6
   },
   "member_spread_deg": {
    "lat": 19.12,
    "lon": 83.46
   },
   "member_spread_now_deg": {
    "lat": 3.69,
    "lon": 44.77
   },
   "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": 88.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-29 23:45:00",
    "lat": 30.43308,
    "lon": -166.32019,
    "alt_m": 14324.8
   },
   "member_spread_deg": {
    "lat": 48.0,
    "lon": 337.4
   },
   "member_spread_now_deg": {
    "lat": 16.89,
    "lon": 339.52
   },
   "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": 117.1,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 23:45:00",
    "lat": 49.19384,
    "lon": -29.65764,
    "alt_m": 14393.6
   },
   "member_spread_deg": {
    "lat": 25.83,
    "lon": 114.98
   },
   "member_spread_now_deg": {
    "lat": 2.42,
    "lon": 46.01
   },
   "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": 7.7,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 23:45:00",
    "lat": 48.12334,
    "lon": 44.56663,
    "alt_m": 13196.8
   },
   "member_spread_deg": {
    "lat": 28.34,
    "lon": 173.66
   },
   "member_spread_now_deg": {
    "lat": 3.26,
    "lon": 4.47
   },
   "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": 311.92,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-29 23:30:00",
    "lat": 23.15809,
    "lon": -49.71565,
    "alt_m": 12724.2
   },
   "member_spread_deg": {
    "lat": 57.35,
    "lon": 240.18
   },
   "member_spread_now_deg": {
    "lat": 39.78,
    "lon": 234.18
   },
   "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": 174.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 23:45:00",
    "lat": 21.53327,
    "lon": 23.95311,
    "alt_m": 13847.0
   },
   "member_spread_deg": {
    "lat": 33.4,
    "lon": 225.5
   },
   "member_spread_now_deg": {
    "lat": 21.7,
    "lon": 92.73
   },
   "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": 72.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 23:30:00",
    "lat": 43.3087,
    "lon": -62.17647,
    "alt_m": 12911.0
   },
   "member_spread_deg": {
    "lat": 32.64,
    "lon": 239.72
   },
   "member_spread_now_deg": {
    "lat": 10.64,
    "lon": 38.91
   },
   "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": 263.25,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 23:30:00",
    "lat": 61.37797,
    "lon": -115.56459,
    "alt_m": 12237.5
   },
   "member_spread_deg": {
    "lat": 35.35,
    "lon": 291.53
   },
   "member_spread_now_deg": {
    "lat": 43.95,
    "lon": 182.77
   },
   "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": 232.32,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 23:30:00",
    "lat": 45.86258,
    "lon": 91.27663,
    "alt_m": 12590.2
   },
   "member_spread_deg": {
    "lat": 55.25,
    "lon": 303.86
   },
   "member_spread_now_deg": {
    "lat": 38.21,
    "lon": 120.85
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KI6DS-11",
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  }
 ]
}