{
 "generated_utc": "2026-09-27T11:27:55Z",
 "gfs_cycle_utc": "2026-09-27T06:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 496.5,
  "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_20260927_06Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260927_06Z.geojson.gz"
 },
 "counts": {
  "flights": 46,
  "members": 9,
  "rows": 203112
 },
 "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": 91.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 05:45:00",
    "lat": 46.74178,
    "lon": -152.58445,
    "alt_m": 12897.6
   },
   "member_spread_deg": {
    "lat": 33.2,
    "lon": 354.42
   },
   "member_spread_now_deg": {
    "lat": 54.66,
    "lon": 73.21
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "AE4ZZ-23",
   "flight_id": "AE4ZZ-23_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 11:01:41",
   "seed_lat": 31.37497,
   "seed_lon": 11.62502,
   "seed_alt_m": 13480.0,
   "seed_age_h": 0.31,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 11:00:00",
    "lat": 60.00889,
    "lon": -150.86553,
    "alt_m": 12559.3
   },
   "member_spread_deg": {
    "lat": 27.34,
    "lon": 337.98
   },
   "member_spread_now_deg": {
    "lat": 0.07,
    "lon": 0.08
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 21:33:40",
   "seed_lat": -72.83333,
   "seed_lon": -85.49999,
   "seed_alt_m": 12120.0,
   "seed_age_h": 13.77,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-04 05:30:00",
    "lat": -71.46752,
    "lon": 135.39938,
    "alt_m": 12219.4
   },
   "member_spread_deg": {
    "lat": 20.58,
    "lon": 257.27
   },
   "member_spread_now_deg": {
    "lat": 6.23,
    "lon": 8.24
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 03:27:48",
   "seed_lat": 44.75,
   "seed_lon": -149.58333,
   "seed_alt_m": 13510.0,
   "seed_age_h": 7.87,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 05:30:00",
    "lat": 17.4214,
    "lon": -71.16648,
    "alt_m": 13903.8
   },
   "member_spread_deg": {
    "lat": 55.99,
    "lon": 66.19
   },
   "member_spread_now_deg": {
    "lat": 0.6,
    "lon": 3.46
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 10:09:19",
   "seed_lat": 31.72917,
   "seed_lon": -28.08333,
   "seed_alt_m": 13570.0,
   "seed_age_h": 1.18,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 09:45:00",
    "lat": 25.21349,
    "lon": 29.10401,
    "alt_m": 13525.2
   },
   "member_spread_deg": {
    "lat": 15.3,
    "lon": 52.19
   },
   "member_spread_now_deg": {
    "lat": 0.51,
    "lon": 0.41
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 02:46:19",
   "seed_lat": 50.35417,
   "seed_lon": -169.70833,
   "seed_alt_m": 13430.0,
   "seed_age_h": 8.56,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 05:45:00",
    "lat": 58.49906,
    "lon": 26.96262,
    "alt_m": 13783.0
   },
   "member_spread_deg": {
    "lat": 37.34,
    "lon": 112.95
   },
   "member_spread_now_deg": {
    "lat": 0.84,
    "lon": 8.45
   },
   "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": 171.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-04 05:30:00",
    "lat": 51.74752,
    "lon": -12.74267,
    "alt_m": 11249.9
   },
   "member_spread_deg": {
    "lat": 46.18,
    "lon": 231.42
   },
   "member_spread_now_deg": {
    "lat": 22.85,
    "lon": 340.83
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 20:33:46",
   "seed_lat": 48.70833,
   "seed_lon": -73.75,
   "seed_alt_m": 12420.0,
   "seed_age_h": 14.77,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 05:30:00",
    "lat": 33.91295,
    "lon": 90.37732,
    "alt_m": 12399.4
   },
   "member_spread_deg": {
    "lat": 25.09,
    "lon": 112.26
   },
   "member_spread_now_deg": {
    "lat": 2.69,
    "lon": 25.74
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 20:06:02",
   "seed_lat": 48.62734,
   "seed_lon": -73.94479,
   "seed_alt_m": 12430.0,
   "seed_age_h": 15.23,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 05:30:00",
    "lat": 34.94271,
    "lon": 95.14008,
    "alt_m": 12394.4
   },
   "member_spread_deg": {
    "lat": 20.5,
    "lon": 106.92
   },
   "member_spread_now_deg": {
    "lat": 2.83,
    "lon": 25.72
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-30",
   "flight_id": "DG2GG-30_2026-08-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 11:56:00",
   "seed_lat": 72.0,
   "seed_lon": 49.83333,
   "seed_alt_m": 12800.0,
   "seed_age_h": 23.4,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 05:30:00",
    "lat": 57.67721,
    "lon": -122.28252,
    "alt_m": 12740.6
   },
   "member_spread_deg": {
    "lat": 27.01,
    "lon": 149.35
   },
   "member_spread_now_deg": {
    "lat": 8.55,
    "lon": 3.32
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-31",
   "flight_id": "DG2GG-31_2026-08-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 23:02:00",
   "seed_lat": 34.22917,
   "seed_lon": -119.70833,
   "seed_alt_m": 13390.0,
   "seed_age_h": 12.3,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 05:30:00",
    "lat": 22.54401,
    "lon": -16.59523,
    "alt_m": 13597.4
   },
   "member_spread_deg": {
    "lat": 27.16,
    "lon": 59.11
   },
   "member_spread_now_deg": {
    "lat": 1.3,
    "lon": 6.5
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-32",
   "flight_id": "DG2GG-32_2026-09-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 23:16:00",
   "seed_lat": 58.95833,
   "seed_lon": -106.375,
   "seed_alt_m": 12930.0,
   "seed_age_h": 12.07,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 05:45:00",
    "lat": 50.9079,
    "lon": 50.10473,
    "alt_m": 13329.5
   },
   "member_spread_deg": {
    "lat": 23.57,
    "lon": 42.58
   },
   "member_spread_now_deg": {
    "lat": 2.64,
    "lon": 13.41
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 00:30:00",
   "seed_lat": 41.3125,
   "seed_lon": -155.33333,
   "seed_alt_m": 13400.0,
   "seed_age_h": 10.83,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 05:30:00",
    "lat": 41.44073,
    "lon": -32.5777,
    "alt_m": 13451.8
   },
   "member_spread_deg": {
    "lat": 47.73,
    "lon": 94.96
   },
   "member_spread_now_deg": {
    "lat": 1.44,
    "lon": 2.86
   },
   "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": 214.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 05:45:00",
    "lat": 8.07697,
    "lon": -34.37826,
    "alt_m": 15310.4
   },
   "member_spread_deg": {
    "lat": 40.34,
    "lon": 277.6
   },
   "member_spread_now_deg": {
    "lat": 51.34,
    "lon": 92.02
   },
   "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": 219.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 05:30:00",
    "lat": 47.37535,
    "lon": 80.73818,
    "alt_m": 14463.5
   },
   "member_spread_deg": {
    "lat": 32.79,
    "lon": 57.7
   },
   "member_spread_now_deg": {
    "lat": 11.5,
    "lon": 48.47
   },
   "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": 190.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-04 05:45:00",
    "lat": -1.80778,
    "lon": -107.08216,
    "alt_m": 14468.7
   },
   "member_spread_deg": {
    "lat": 83.55,
    "lon": 302.44
   },
   "member_spread_now_deg": {
    "lat": 44.45,
    "lon": 339.88
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DO3GU-8",
   "flight_id": "DO3GU-8_2026-08-12",
   "payload_type": "APRS",
   "seed_time": "2026-09-26 19:41:35",
   "seed_lat": 47.76366,
   "seed_lon": -113.55491,
   "seed_alt_m": 14135.0,
   "seed_age_h": 15.64,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 05:45:00",
    "lat": 41.52456,
    "lon": 62.15388,
    "alt_m": 14187.6
   },
   "member_spread_deg": {
    "lat": 29.13,
    "lon": 43.86
   },
   "member_spread_now_deg": {
    "lat": 5.99,
    "lon": 7.15
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 10:33:00",
   "seed_lat": 47.22917,
   "seed_lon": 6.75,
   "seed_alt_m": 13420.0,
   "seed_age_h": 0.78,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 10:00:00",
    "lat": 39.49519,
    "lon": 131.11251,
    "alt_m": 12857.9
   },
   "member_spread_deg": {
    "lat": 9.31,
    "lon": 312.41
   },
   "member_spread_now_deg": {
    "lat": 0.23,
    "lon": 0.43
   },
   "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": 276.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-04 05:45:00",
    "lat": 41.10468,
    "lon": 144.39452,
    "alt_m": 13359.9
   },
   "member_spread_deg": {
    "lat": 36.82,
    "lon": 309.71
   },
   "member_spread_now_deg": {
    "lat": 40.44,
    "lon": 145.51
   },
   "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": 174.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 05:30:00",
    "lat": 47.15261,
    "lon": 45.89855,
    "alt_m": 13068.7
   },
   "member_spread_deg": {
    "lat": 31.95,
    "lon": 257.95
   },
   "member_spread_now_deg": {
    "lat": 28.98,
    "lon": 99.62
   },
   "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": 334.32,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 05:30:00",
    "lat": 50.203,
    "lon": 174.39832,
    "alt_m": 12136.3
   },
   "member_spread_deg": {
    "lat": 27.69,
    "lon": 298.03
   },
   "member_spread_now_deg": {
    "lat": 52.81,
    "lon": 198.74
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 17:45:45",
   "seed_lat": 68.62495,
   "seed_lon": -51.87498,
   "seed_alt_m": 12840.0,
   "seed_age_h": 17.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 05:45:00",
    "lat": 79.81543,
    "lon": 7.75736,
    "alt_m": 12777.2
   },
   "member_spread_deg": {
    "lat": 39.68,
    "lon": 84.67
   },
   "member_spread_now_deg": {
    "lat": 3.98,
    "lon": 3.96
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KJ4AWK-1",
   "flight_id": "KJ4AWK-1_2026-08-22",
   "payload_type": "APRS",
   "seed_time": "2026-09-26 23:40:52",
   "seed_lat": 59.10342,
   "seed_lon": -116.23583,
   "seed_alt_m": 12175.0,
   "seed_age_h": 11.65,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-04 05:45:00",
    "lat": 67.81175,
    "lon": 32.9643,
    "alt_m": 12486.7
   },
   "member_spread_deg": {
    "lat": 23.83,
    "lon": 173.14
   },
   "member_spread_now_deg": {
    "lat": 3.54,
    "lon": 3.44
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
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  },
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  },
  {
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  {
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  }
 ]
}