{
 "generated_utc": "2026-09-24T11:27:25Z",
 "gfs_cycle_utc": "2026-09-24T06:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 455.5,
  "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_20260924_06Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260924_06Z.geojson.gz"
 },
 "counts": {
  "flights": 49,
  "members": 9,
  "rows": 210078
 },
 "flights": [
  {
   "callsign": "AE4ZZ-22",
   "flight_id": "AE4ZZ-22_2026-09-19",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 15:38:41",
   "seed_lat": 44.43746,
   "seed_lon": -30.29163,
   "seed_alt_m": 13470.0,
   "seed_age_h": 19.69,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 05:45:00",
    "lat": 48.50173,
    "lon": 84.71643,
    "alt_m": 13112.5
   },
   "member_spread_deg": {
    "lat": 25.09,
    "lon": 282.91
   },
   "member_spread_now_deg": {
    "lat": 3.23,
    "lon": 10.97
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AE4ZZ-23",
   "flight_id": "AE4ZZ-23_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 11:00:00",
   "seed_lat": 52.49997,
   "seed_lon": -12.08329,
   "seed_alt_m": 13270.0,
   "seed_age_h": 0.33,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 11:00:00",
    "lat": 44.74648,
    "lon": 92.17911,
    "alt_m": 13196.6
   },
   "member_spread_deg": {
    "lat": 9.7,
    "lon": 145.98
   },
   "member_spread_now_deg": {
    "lat": 0.18,
    "lon": 0.33
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 06:33:40",
   "seed_lat": -67.875,
   "seed_lon": 100.87501,
   "seed_alt_m": 12210.0,
   "seed_age_h": 4.77,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-01 06:00:00",
    "lat": -54.13939,
    "lon": 89.50821,
    "alt_m": 11897.8
   },
   "member_spread_deg": {
    "lat": 22.13,
    "lon": 68.95
   },
   "member_spread_now_deg": {
    "lat": 2.54,
    "lon": 1.96
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AIRCOR-6",
   "flight_id": "AIRCOR-6_2026-09-14",
   "payload_type": "APRS",
   "seed_time": "2026-09-23 15:39:13",
   "seed_lat": 40.33008,
   "seed_lon": -104.83542,
   "seed_alt_m": 15554.0,
   "seed_age_h": 19.68,
   "float_reliable": false,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 05:45:00",
    "lat": 31.2959,
    "lon": -44.18932,
    "alt_m": 15768.8
   },
   "member_spread_deg": {
    "lat": 10.05,
    "lon": 86.53
   },
   "member_spread_now_deg": {
    "lat": 8.56,
    "lon": 12.3
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 06:10:48",
   "seed_lat": 26.70833,
   "seed_lon": 166.125,
   "seed_alt_m": 13790.0,
   "seed_age_h": 5.15,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-01 05:45:00",
    "lat": 27.85723,
    "lon": -84.2614,
    "alt_m": 13890.1
   },
   "member_spread_deg": {
    "lat": 29.48,
    "lon": 35.53
   },
   "member_spread_now_deg": {
    "lat": 1.52,
    "lon": 0.82
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 01:50:47",
   "seed_lat": 44.27083,
   "seed_lon": -126.20833,
   "seed_alt_m": 13120.0,
   "seed_age_h": 9.49,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 05:45:00",
    "lat": 34.52793,
    "lon": 39.89973,
    "alt_m": 13042.4
   },
   "member_spread_deg": {
    "lat": 28.29,
    "lon": 39.82
   },
   "member_spread_now_deg": {
    "lat": 0.25,
    "lon": 3.87
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 09:05:18",
   "seed_lat": 44.45833,
   "seed_lon": 90.45833,
   "seed_alt_m": 13790.0,
   "seed_age_h": 2.25,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-01 08:30:00",
    "lat": 57.59567,
    "lon": -44.4418,
    "alt_m": 13593.1
   },
   "member_spread_deg": {
    "lat": 22.78,
    "lon": 107.71
   },
   "member_spread_now_deg": {
    "lat": 0.17,
    "lon": 0.41
   },
   "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": 99.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-01 05:30:00",
    "lat": 47.94437,
    "lon": -150.97363,
    "alt_m": 11442.5
   },
   "member_spread_deg": {
    "lat": 33.26,
    "lon": 245.43
   },
   "member_spread_now_deg": {
    "lat": 19.93,
    "lon": 73.67
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 00:34:32",
   "seed_lat": 46.5,
   "seed_lon": -128.75,
   "seed_alt_m": 12290.0,
   "seed_age_h": 10.76,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-01 05:30:00",
    "lat": 49.70949,
    "lon": 17.13072,
    "alt_m": 12379.7
   },
   "member_spread_deg": {
    "lat": 15.8,
    "lon": 86.11
   },
   "member_spread_now_deg": {
    "lat": 2.31,
    "lon": 5.83
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 00:34:32",
   "seed_lat": 46.49956,
   "seed_lon": -128.75018,
   "seed_alt_m": 12290.0,
   "seed_age_h": 10.76,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-01 05:30:00",
    "lat": 49.70836,
    "lon": 17.13095,
    "alt_m": 12379.7
   },
   "member_spread_deg": {
    "lat": 15.79,
    "lon": 86.11
   },
   "member_spread_now_deg": {
    "lat": 2.31,
    "lon": 5.83
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-30",
   "flight_id": "DG2GG-30_2026-08-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 13:21:00",
   "seed_lat": 40.22917,
   "seed_lon": 25.54167,
   "seed_alt_m": 12550.0,
   "seed_age_h": 21.98,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 05:45:00",
    "lat": 42.69312,
    "lon": 166.87053,
    "alt_m": 12871.1
   },
   "member_spread_deg": {
    "lat": 9.92,
    "lon": 135.28
   },
   "member_spread_now_deg": {
    "lat": 7.16,
    "lon": 8.99
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-31",
   "flight_id": "DG2GG-31_2026-08-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 02:12:00",
   "seed_lat": 49.75,
   "seed_lon": -175.875,
   "seed_alt_m": 12820.0,
   "seed_age_h": 9.13,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 05:45:00",
    "lat": 37.62659,
    "lon": -57.00687,
    "alt_m": 13360.3
   },
   "member_spread_deg": {
    "lat": 59.45,
    "lon": 132.49
   },
   "member_spread_now_deg": {
    "lat": 6.07,
    "lon": 8.32
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-32",
   "flight_id": "DG2GG-32_2026-09-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 00:36:00",
   "seed_lat": 52.60417,
   "seed_lon": -179.04167,
   "seed_alt_m": 12990.0,
   "seed_age_h": 10.73,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 05:30:00",
    "lat": 61.36659,
    "lon": 50.33613,
    "alt_m": 13333.7
   },
   "member_spread_deg": {
    "lat": 37.18,
    "lon": 153.23
   },
   "member_spread_now_deg": {
    "lat": 7.0,
    "lon": 10.12
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 04:35:00",
   "seed_lat": 21.41667,
   "seed_lon": 161.0,
   "seed_alt_m": 13500.0,
   "seed_age_h": 6.75,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 05:30:00",
    "lat": 28.25489,
    "lon": -139.67615,
    "alt_m": 13564.0
   },
   "member_spread_deg": {
    "lat": 20.06,
    "lon": 301.36
   },
   "member_spread_now_deg": {
    "lat": 2.13,
    "lon": 1.23
   },
   "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": 142.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 05:45:00",
    "lat": 1.17561,
    "lon": -45.37361,
    "alt_m": 15283.8
   },
   "member_spread_deg": {
    "lat": 52.89,
    "lon": 177.76
   },
   "member_spread_now_deg": {
    "lat": 46.64,
    "lon": 64.46
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "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": 147.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 05:30:00",
    "lat": 52.43908,
    "lon": -28.31316,
    "alt_m": 14162.2
   },
   "member_spread_deg": {
    "lat": 21.34,
    "lon": 35.9
   },
   "member_spread_now_deg": {
    "lat": 14.29,
    "lon": 359.83
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "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": 118.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-01 05:45:00",
    "lat": 33.20296,
    "lon": -127.77107,
    "alt_m": 14285.0
   },
   "member_spread_deg": {
    "lat": 48.99,
    "lon": 320.86
   },
   "member_spread_now_deg": {
    "lat": 31.46,
    "lon": 343.59
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DO3GU-8",
   "flight_id": "DO3GU-8_2026-08-12",
   "payload_type": "APRS",
   "seed_time": "2026-09-24 02:46:08",
   "seed_lat": 45.11771,
   "seed_lon": 143.63833,
   "seed_alt_m": 13946.0,
   "seed_age_h": 8.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-01 05:45:00",
    "lat": 49.32372,
    "lon": -15.10877,
    "alt_m": 13668.2
   },
   "member_spread_deg": {
    "lat": 17.22,
    "lon": 25.47
   },
   "member_spread_now_deg": {
    "lat": 2.13,
    "lon": 7.17
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 17:58:00",
   "seed_lat": 42.97917,
   "seed_lon": -54.41667,
   "seed_alt_m": 13380.0,
   "seed_age_h": 17.37,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 05:30:00",
    "lat": 41.83747,
    "lon": 110.47342,
    "alt_m": 13029.1
   },
   "member_spread_deg": {
    "lat": 22.39,
    "lon": 329.37
   },
   "member_spread_now_deg": {
    "lat": 4.95,
    "lon": 11.52
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 204.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 05:45:00",
    "lat": 29.77772,
    "lon": 64.57062,
    "alt_m": 13661.7
   },
   "member_spread_deg": {
    "lat": 39.56,
    "lon": 235.16
   },
   "member_spread_now_deg": {
    "lat": 48.32,
    "lon": 104.94
   },
   "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": 102.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 05:30:00",
    "lat": 61.15188,
    "lon": 18.50041,
    "alt_m": 13099.1
   },
   "member_spread_deg": {
    "lat": 29.67,
    "lon": 129.45
   },
   "member_spread_now_deg": {
    "lat": 13.36,
    "lon": 47.51
   },
   "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": 293.25,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 05:30:00",
    "lat": 52.79915,
    "lon": -71.9964,
    "alt_m": 12676.7
   },
   "member_spread_deg": {
    "lat": 47.89,
    "lon": 248.6
   },
   "member_spread_now_deg": {
    "lat": 41.71,
    "lon": 195.79
   },
   "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": 262.32,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 05:30:00",
    "lat": 48.52568,
    "lon": 64.90261,
    "alt_m": 12337.5
   },
   "member_spread_deg": {
    "lat": 41.43,
    "lon": 119.76
   },
   "member_spread_now_deg": {
    "lat": 34.63,
    "lon": 178.35
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KI6DS-11",
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 ]
}