{
 "generated_utc": "2026-09-20T23:27:49Z",
 "gfs_cycle_utc": "2026-09-20T18:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 484.0,
  "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_20260920_18Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260920_18Z.geojson.gz"
 },
 "counts": {
  "flights": 51,
  "members": 9,
  "rows": 221409
 },
 "flights": [
  {
   "callsign": "AE4ZZ-22",
   "flight_id": "AE4ZZ-22_2026-09-19",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 19:53:45",
   "seed_lat": 36.85412,
   "seed_lon": -81.16661,
   "seed_alt_m": 13520.0,
   "seed_age_h": 3.44,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 19:30:00",
    "lat": 31.08457,
    "lon": 21.58827,
    "alt_m": 13377.7
   },
   "member_spread_deg": {
    "lat": 42.02,
    "lon": 32.7
   },
   "member_spread_now_deg": {
    "lat": 0.89,
    "lon": 0.67
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 00:18:40",
   "seed_lat": -74.29167,
   "seed_lon": -123.99999,
   "seed_alt_m": 12180.0,
   "seed_age_h": 23.02,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-27 17:45:00",
    "lat": -60.43948,
    "lon": -51.94851,
    "alt_m": 12053.7
   },
   "member_spread_deg": {
    "lat": 11.7,
    "lon": 37.1
   },
   "member_spread_now_deg": {
    "lat": 5.05,
    "lon": 16.09
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AI4SR-1",
   "flight_id": "AI4SR-1_2026-09-03",
   "payload_type": "APRS",
   "seed_time": "2026-09-07 13:29:52",
   "seed_lat": 11.02275,
   "seed_lon": -74.40442,
   "seed_alt_m": 12430.0,
   "seed_age_h": 321.84,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 17:30:00",
    "lat": -20.84337,
    "lon": -86.84462,
    "alt_m": 12329.8
   },
   "member_spread_deg": {
    "lat": 61.55,
    "lon": 294.97
   },
   "member_spread_now_deg": {
    "lat": 51.98,
    "lon": 172.84
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "AI4SR-2",
   "flight_id": "AI4SR-2_2026-09-04",
   "payload_type": "APRS",
   "seed_time": "2026-09-07 15:52:34",
   "seed_lat": 11.26191,
   "seed_lon": -74.64716,
   "seed_alt_m": 13006.0,
   "seed_age_h": 319.46,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 17:30:00",
    "lat": 27.39755,
    "lon": 159.78497,
    "alt_m": 13028.6
   },
   "member_spread_deg": {
    "lat": 60.93,
    "lon": 278.13
   },
   "member_spread_now_deg": {
    "lat": 42.77,
    "lon": 150.29
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-19 10:08:48",
   "seed_lat": 39.52083,
   "seed_lon": 64.875,
   "seed_alt_m": 13480.0,
   "seed_age_h": 37.19,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 17:45:00",
    "lat": 28.7524,
    "lon": 173.69647,
    "alt_m": 13832.2
   },
   "member_spread_deg": {
    "lat": 32.71,
    "lon": 286.73
   },
   "member_spread_now_deg": {
    "lat": 1.62,
    "lon": 16.6
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 22:59:18",
   "seed_lat": 49.35417,
   "seed_lon": 105.95833,
   "seed_alt_m": 12800.0,
   "seed_age_h": 0.35,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 23:00:00",
    "lat": 53.99615,
    "lon": 6.7402,
    "alt_m": 12743.7
   },
   "member_spread_deg": {
    "lat": 46.21,
    "lon": 127.65
   },
   "member_spread_now_deg": {
    "lat": 0.03,
    "lon": 0.17
   },
   "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": 55.95,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 17:30:00",
    "lat": 50.10326,
    "lon": -156.91135,
    "alt_m": 13397.0
   },
   "member_spread_deg": {
    "lat": 25.05,
    "lon": 351.54
   },
   "member_spread_now_deg": {
    "lat": 3.61,
    "lon": 23.54
   },
   "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": 15.85,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 17:30:00",
    "lat": 34.12066,
    "lon": 67.4281,
    "alt_m": 11458.1
   },
   "member_spread_deg": {
    "lat": 15.41,
    "lon": 260.6
   },
   "member_spread_now_deg": {
    "lat": 3.14,
    "lon": 5.85
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 04:44:17",
   "seed_lat": 44.91667,
   "seed_lon": 79.20833,
   "seed_alt_m": 12240.0,
   "seed_age_h": 18.6,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-27 17:45:00",
    "lat": 32.06916,
    "lon": -12.87105,
    "alt_m": 12377.4
   },
   "member_spread_deg": {
    "lat": 36.04,
    "lon": 111.77
   },
   "member_spread_now_deg": {
    "lat": 1.37,
    "lon": 2.11
   },
   "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": 18.58,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-27 17:45:00",
    "lat": 31.9802,
    "lon": -13.0817,
    "alt_m": 12384.4
   },
   "member_spread_deg": {
    "lat": 35.91,
    "lon": 111.62
   },
   "member_spread_now_deg": {
    "lat": 1.36,
    "lon": 2.12
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-25",
   "flight_id": "DG2GG-25_2026-06-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-07 21:12:00",
   "seed_lat": 24.22917,
   "seed_lon": -100.08333,
   "seed_alt_m": 13800.0,
   "seed_age_h": 314.13,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-27 17:45:00",
    "lat": 16.97751,
    "lon": 17.38968,
    "alt_m": 13844.7
   },
   "member_spread_deg": {
    "lat": 48.33,
    "lon": 277.42
   },
   "member_spread_now_deg": {
    "lat": 41.06,
    "lon": 193.96
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DG2GG-30",
   "flight_id": "DG2GG-30_2026-08-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 13:41:00",
   "seed_lat": 63.45833,
   "seed_lon": 14.16667,
   "seed_alt_m": 11910.0,
   "seed_age_h": 9.65,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-27 17:45:00",
    "lat": 63.78642,
    "lon": 51.14741,
    "alt_m": 12864.7
   },
   "member_spread_deg": {
    "lat": 30.63,
    "lon": 37.44
   },
   "member_spread_now_deg": {
    "lat": 0.42,
    "lon": 0.52
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-31",
   "flight_id": "DG2GG-31_2026-08-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 11:32:00",
   "seed_lat": 42.29167,
   "seed_lon": 50.875,
   "seed_alt_m": 13270.0,
   "seed_age_h": 11.8,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 17:30:00",
    "lat": 48.85747,
    "lon": -99.23994,
    "alt_m": 13209.9
   },
   "member_spread_deg": {
    "lat": 11.13,
    "lon": 41.82
   },
   "member_spread_now_deg": {
    "lat": 1.57,
    "lon": 2.92
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-32",
   "flight_id": "DG2GG-32_2026-09-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 10:26:00",
   "seed_lat": 46.33333,
   "seed_lon": 60.45833,
   "seed_alt_m": 13460.0,
   "seed_age_h": 12.9,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 17:30:00",
    "lat": 59.87083,
    "lon": -70.26851,
    "alt_m": 13170.6
   },
   "member_spread_deg": {
    "lat": 20.61,
    "lon": 36.01
   },
   "member_spread_now_deg": {
    "lat": 2.61,
    "lon": 0.9
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 07:05:00",
   "seed_lat": 43.1875,
   "seed_lon": 94.91667,
   "seed_alt_m": 13190.0,
   "seed_age_h": 16.25,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 17:30:00",
    "lat": 39.57561,
    "lon": -133.99161,
    "alt_m": 13228.9
   },
   "member_spread_deg": {
    "lat": 37.64,
    "lon": 314.69
   },
   "member_spread_now_deg": {
    "lat": 0.36,
    "lon": 6.81
   },
   "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": 58.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 17:45:00",
    "lat": 20.60548,
    "lon": -47.90736,
    "alt_m": 15250.2
   },
   "member_spread_deg": {
    "lat": 55.21,
    "lon": 88.02
   },
   "member_spread_now_deg": {
    "lat": 10.41,
    "lon": 10.8
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 63.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 17:30:00",
    "lat": 66.67343,
    "lon": -123.66437,
    "alt_m": 14095.6
   },
   "member_spread_deg": {
    "lat": 9.78,
    "lon": 37.28
   },
   "member_spread_now_deg": {
    "lat": 6.61,
    "lon": 9.41
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 34.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-27 17:45:00",
    "lat": 27.36836,
    "lon": -178.78642,
    "alt_m": 14209.1
   },
   "member_spread_deg": {
    "lat": 39.15,
    "lon": 341.14
   },
   "member_spread_now_deg": {
    "lat": 2.08,
    "lon": 19.4
   },
   "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": 63.1,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 17:45:00",
    "lat": 56.28761,
    "lon": -82.13888,
    "alt_m": 14231.2
   },
   "member_spread_deg": {
    "lat": 18.31,
    "lon": 309.03
   },
   "member_spread_now_deg": {
    "lat": 0.86,
    "lon": 13.17
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 22:43:00",
   "seed_lat": 34.64583,
   "seed_lon": -115.25,
   "seed_alt_m": 13490.0,
   "seed_age_h": 0.62,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 22:15:00",
    "lat": 29.40023,
    "lon": 8.51402,
    "alt_m": 13545.5
   },
   "member_spread_deg": {
    "lat": 29.64,
    "lon": 78.78
   },
   "member_spread_now_deg": {
    "lat": 0.09,
    "lon": 0.19
   },
   "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": 257.92,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-27 17:30:00",
    "lat": 24.4328,
    "lon": -25.63227,
    "alt_m": 12760.6
   },
   "member_spread_deg": {
    "lat": 31.56,
    "lon": 226.45
   },
   "member_spread_now_deg": {
    "lat": 38.21,
    "lon": 253.32
   },
   "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": 120.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 17:45:00",
    "lat": 23.96764,
    "lon": -28.79122,
    "alt_m": 13812.3
   },
   "member_spread_deg": {
    "lat": 48.59,
    "lon": 105.26
   },
   "member_spread_now_deg": {
    "lat": 27.69,
    "lon": 89.76
   },
   "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": 18.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 17:30:00",
    "lat": 34.99758,
    "lon": -72.8197,
    "alt_m": 13042.8
   },
   "member_spread_deg": {
    "lat": 21.12,
    "lon": 43.64
   },
   "member_spread_now_deg": {
    "lat": 7.78,
    "lon": 1.75
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KD7FXO-1",
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   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "W7EEU-11",
   "flight_id": "W7EEU-11_2026-08-23",
   "payload_type": "APRS",
   "seed_time": "2026-09-19 14:28:59",
   "seed_lat": 63.95584,
   "seed_lon": 16.81967,
   "seed_alt_m": 11926.0,
   "seed_age_h": 32.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-27 17:30:00",
    "lat": 54.36264,
    "lon": -138.76411,
    "alt_m": 11860.8
   },
   "member_spread_deg": {
    "lat": 21.46,
    "lon": 133.45
   },
   "member_spread_now_deg": {
    "lat": 5.06,
    "lon": 31.06
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "WD4CFN-21",
   "flight_id": "WD4CFN-21_2026-09-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 16:23:54",
   "seed_lat": 26.43741,
   "seed_lon": -36.79154,
   "seed_alt_m": 13120.0,
   "seed_age_h": 6.94,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 17:30:00",
    "lat": 35.1156,
    "lon": 133.12862,
    "alt_m": 13003.8
   },
   "member_spread_deg": {
    "lat": 13.51,
    "lon": 88.62
   },
   "member_spread_now_deg": {
    "lat": 0.81,
    "lon": 1.56
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "ZS6WBT-1",
   "flight_id": "ZS6WBT-1_2026-08-19",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 22:01:00",
   "seed_lat": -13.125,
   "seed_lon": 153.45833,
   "seed_alt_m": 15875.0,
   "seed_age_h": 1.32,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-27 21:30:00",
    "lat": -20.41586,
    "lon": -168.51489,
    "alt_m": 15710.4
   },
   "member_spread_deg": {
    "lat": 14.6,
    "lon": 345.14
   },
   "member_spread_now_deg": {
    "lat": 0.07,
    "lon": 0.17
   },
   "display_as": "track",
   "display_reason": "fresh"
  }
 ]
}