{
 "generated_utc": "2026-09-22T05:27:59Z",
 "gfs_cycle_utc": "2026-09-22T00:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 482.0,
  "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_00Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260922_00Z.geojson.gz"
 },
 "counts": {
  "flights": 48,
  "members": 9,
  "rows": 205236
 },
 "flights": [
  {
   "callsign": "AE4ZZ-22",
   "flight_id": "AE4ZZ-22_2026-09-19",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 18:53:45",
   "seed_lat": 38.41662,
   "seed_lon": -69.49996,
   "seed_alt_m": 13560.0,
   "seed_age_h": 10.44,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 23:30:00",
    "lat": 44.62855,
    "lon": 50.8463,
    "alt_m": 13191.4
   },
   "member_spread_deg": {
    "lat": 32.73,
    "lon": 87.7
   },
   "member_spread_now_deg": {
    "lat": 0.61,
    "lon": 2.72
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 16:53:40",
   "seed_lat": -67.52083,
   "seed_lon": -38.83332,
   "seed_alt_m": 12270.0,
   "seed_age_h": 12.44,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-28 23:30:00",
    "lat": -66.01348,
    "lon": 41.87768,
    "alt_m": 11989.5
   },
   "member_spread_deg": {
    "lat": 13.47,
    "lon": 112.08
   },
   "member_spread_now_deg": {
    "lat": 3.64,
    "lon": 1.4
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 02:38:17",
   "seed_lat": 38.33333,
   "seed_lon": 174.16667,
   "seed_alt_m": 13760.0,
   "seed_age_h": 2.7,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 02:15:00",
    "lat": 32.63875,
    "lon": -124.49951,
    "alt_m": 13677.7
   },
   "member_spread_deg": {
    "lat": 47.53,
    "lon": 297.98
   },
   "member_spread_now_deg": {
    "lat": 0.84,
    "lon": 1.17
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 03:54:48",
   "seed_lat": 54.375,
   "seed_lon": 157.95833,
   "seed_alt_m": 12480.0,
   "seed_age_h": 1.42,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 03:30:00",
    "lat": 51.62616,
    "lon": 8.90818,
    "alt_m": 13064.9
   },
   "member_spread_deg": {
    "lat": 24.36,
    "lon": 179.17
   },
   "member_spread_now_deg": {
    "lat": 0.35,
    "lon": 0.89
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-18 15:23:18",
   "seed_lat": 40.79167,
   "seed_lon": 19.75,
   "seed_alt_m": 14090.0,
   "seed_age_h": 85.95,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 23:30:00",
    "lat": 58.73311,
    "lon": -114.53218,
    "alt_m": 13340.8
   },
   "member_spread_deg": {
    "lat": 26.2,
    "lon": 341.26
   },
   "member_spread_now_deg": {
    "lat": 13.23,
    "lon": 46.44
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "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": 45.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 23:30:00",
    "lat": 40.08947,
    "lon": 123.67106,
    "alt_m": 11342.1
   },
   "member_spread_deg": {
    "lat": 25.02,
    "lon": 301.13
   },
   "member_spread_now_deg": {
    "lat": 3.92,
    "lon": 30.85
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 06:04:31",
   "seed_lat": 45.25,
   "seed_lon": 106.33333,
   "seed_alt_m": 12200.0,
   "seed_age_h": 23.26,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-28 23:30:00",
    "lat": 38.61136,
    "lon": 5.73336,
    "alt_m": 12451.2
   },
   "member_spread_deg": {
    "lat": 33.82,
    "lon": 118.61
   },
   "member_spread_now_deg": {
    "lat": 4.97,
    "lon": 5.93
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 04:45:02",
   "seed_lat": 44.90608,
   "seed_lon": 79.22761,
   "seed_alt_m": 12240.0,
   "seed_age_h": 48.58,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-28 23:45:00",
    "lat": 51.11567,
    "lon": -48.83866,
    "alt_m": 12275.7
   },
   "member_spread_deg": {
    "lat": 37.98,
    "lon": 148.81
   },
   "member_spread_now_deg": {
    "lat": 3.84,
    "lon": 7.35
   },
   "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": 22.23,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-28 23:30:00",
    "lat": 55.50832,
    "lon": 86.62791,
    "alt_m": 12764.5
   },
   "member_spread_deg": {
    "lat": 21.11,
    "lon": 106.01
   },
   "member_spread_now_deg": {
    "lat": 1.86,
    "lon": 3.1
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-31",
   "flight_id": "DG2GG-31_2026-08-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 04:27:00",
   "seed_lat": 39.6875,
   "seed_lon": 94.20833,
   "seed_alt_m": 13220.0,
   "seed_age_h": 0.88,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 04:30:00",
    "lat": 31.41057,
    "lon": -84.29538,
    "alt_m": 13384.1
   },
   "member_spread_deg": {
    "lat": 30.04,
    "lon": 52.41
   },
   "member_spread_now_deg": {
    "lat": 0.06,
    "lon": 0.37
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-32",
   "flight_id": "DG2GG-32_2026-09-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 02:01:00",
   "seed_lat": 43.83333,
   "seed_lon": 95.58333,
   "seed_alt_m": 13390.0,
   "seed_age_h": 3.32,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 01:30:00",
    "lat": 46.62965,
    "lon": -18.59219,
    "alt_m": 13009.6
   },
   "member_spread_deg": {
    "lat": 19.93,
    "lon": 105.43
   },
   "member_spread_now_deg": {
    "lat": 0.51,
    "lon": 1.23
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 03:10:00",
   "seed_lat": 40.60417,
   "seed_lon": 177.375,
   "seed_alt_m": 13400.0,
   "seed_age_h": 2.17,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 02:45:00",
    "lat": 23.17007,
    "lon": -177.53045,
    "alt_m": 13545.3
   },
   "member_spread_deg": {
    "lat": 21.58,
    "lon": 345.98
   },
   "member_spread_now_deg": {
    "lat": 1.01,
    "lon": 1.19
   },
   "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": 88.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 23:45:00",
    "lat": 17.2257,
    "lon": -32.2916,
    "alt_m": 15300.2
   },
   "member_spread_deg": {
    "lat": 46.82,
    "lon": 116.59
   },
   "member_spread_now_deg": {
    "lat": 11.61,
    "lon": 21.9
   },
   "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": 93.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 23:30:00",
    "lat": 69.7523,
    "lon": -68.65911,
    "alt_m": 14081.4
   },
   "member_spread_deg": {
    "lat": 9.43,
    "lon": 80.16
   },
   "member_spread_now_deg": {
    "lat": 5.49,
    "lon": 26.34
   },
   "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": 64.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-28 23:45:00",
    "lat": 26.25112,
    "lon": -178.76716,
    "alt_m": 14246.1
   },
   "member_spread_deg": {
    "lat": 30.4,
    "lon": 129.71
   },
   "member_spread_now_deg": {
    "lat": 9.18,
    "lon": 50.84
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 93.1,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 23:45:00",
    "lat": 59.36361,
    "lon": -52.51799,
    "alt_m": 13967.5
   },
   "member_spread_deg": {
    "lat": 26.01,
    "lon": 109.36
   },
   "member_spread_now_deg": {
    "lat": 5.63,
    "lon": 23.71
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 22:28:00",
   "seed_lat": 34.45833,
   "seed_lon": -94.08333,
   "seed_alt_m": 13530.0,
   "seed_age_h": 6.87,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 23:30:00",
    "lat": 49.10094,
    "lon": 39.65945,
    "alt_m": 13194.4
   },
   "member_spread_deg": {
    "lat": 18.87,
    "lon": 156.3
   },
   "member_spread_now_deg": {
    "lat": 0.41,
    "lon": 1.11
   },
   "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": 287.92,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-28 23:30:00",
    "lat": 22.38725,
    "lon": -50.59375,
    "alt_m": 12813.4
   },
   "member_spread_deg": {
    "lat": 58.97,
    "lon": 215.98
   },
   "member_spread_now_deg": {
    "lat": 37.4,
    "lon": 232.03
   },
   "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": 150.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 23:45:00",
    "lat": 23.24482,
    "lon": -13.91861,
    "alt_m": 13851.8
   },
   "member_spread_deg": {
    "lat": 22.82,
    "lon": 285.43
   },
   "member_spread_now_deg": {
    "lat": 38.5,
    "lon": 102.82
   },
   "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": 48.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 23:30:00",
    "lat": 43.71705,
    "lon": -24.57447,
    "alt_m": 12976.3
   },
   "member_spread_deg": {
    "lat": 15.15,
    "lon": 66.9
   },
   "member_spread_now_deg": {
    "lat": 8.9,
    "lon": 352.35
   },
   "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": 239.25,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 23:30:00",
    "lat": 45.08029,
    "lon": -159.60094,
    "alt_m": 12315.2
   },
   "member_spread_deg": {
    "lat": 34.57,
    "lon": 316.14
   },
   "member_spread_now_deg": {
    "lat": 29.62,
    "lon": 186.68
   },
   "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": 208.32,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 23:30:00",
    "lat": 43.4899,
    "lon": 70.75952,
    "alt_m": 12597.6
   },
   "member_spread_deg": {
    "lat": 53.23,
    "lon": 298.47
   },
   "member_spread_now_deg": {
    "lat": 15.78,
    "lon": 90.91
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 03:10:45",
   "seed_lat": 53.81245,
   "seed_lon": -159.37498,
   "seed_alt_m": 12870.0,
   "seed_age_h": 2.16,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 02:45:00",
    "lat": 59.08861,
    "lon": -26.62016,
    "alt_m": 12712.9
   },
   "member_spread_deg": {
    "lat": 11.82,
    "lon": 18.49
   },
   "member_spread_now_deg": {
    "lat": 0.18,
    "lon": 0.22
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
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 ]
}