{
 "generated_utc": "2026-08-03T11:27:18Z",
 "gfs_cycle_utc": "2026-08-03T06:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 482.5,
  "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_20260803_06Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260803_06Z.geojson.gz"
 },
 "counts": {
  "flights": 38,
  "members": 9,
  "rows": 189108
 },
 "flights": [
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-08-02 23:03:40",
   "seed_lat": -46.08334,
   "seed_lon": -106.24999,
   "seed_alt_m": 12240.0,
   "seed_age_h": 12.27,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-10 05:30:00",
    "lat": -51.3169,
    "lon": 168.8239,
    "alt_m": 12843.5
   },
   "member_spread_deg": {
    "lat": 27.5,
    "lon": 353.03
   },
   "member_spread_now_deg": {
    "lat": 0.08,
    "lon": 3.62
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-24 17:39:48",
   "seed_lat": 59.97917,
   "seed_lon": 4.08333,
   "seed_alt_m": 13000.0,
   "seed_age_h": 233.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 05:45:00",
    "lat": 44.04721,
    "lon": -22.29099,
    "alt_m": 13294.4
   },
   "member_spread_deg": {
    "lat": 29.92,
    "lon": 125.96
   },
   "member_spread_now_deg": {
    "lat": 27.23,
    "lon": 332.52
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 07:15:19",
   "seed_lat": 70.85417,
   "seed_lon": 140.58333,
   "seed_alt_m": 12340.0,
   "seed_age_h": 4.08,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-10 06:45:00",
    "lat": 58.33117,
    "lon": -111.74876,
    "alt_m": 12543.9
   },
   "member_spread_deg": {
    "lat": 25.26,
    "lon": 129.01
   },
   "member_spread_now_deg": {
    "lat": 0.8,
    "lon": 8.38
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 10:48:04",
   "seed_lat": 25.0625,
   "seed_lon": -39.04167,
   "seed_alt_m": 14585.0,
   "seed_age_h": 0.53,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 10:15:00",
    "lat": 43.81803,
    "lon": 104.9324,
    "alt_m": 14211.7
   },
   "member_spread_deg": {
    "lat": 25.42,
    "lon": 94.25
   },
   "member_spread_now_deg": {
    "lat": 0.0,
    "lon": 0.26
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 03:16:30",
   "seed_lat": 31.72917,
   "seed_lon": -165.79167,
   "seed_alt_m": 13075.0,
   "seed_age_h": 8.06,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 05:45:00",
    "lat": 41.1534,
    "lon": -100.62094,
    "alt_m": 13164.2
   },
   "member_spread_deg": {
    "lat": 18.64,
    "lon": 122.8
   },
   "member_spread_now_deg": {
    "lat": 1.4,
    "lon": 2.35
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-25",
   "flight_id": "DG2GG-25_2026-06-15",
   "payload_type": "WSPR",
   "seed_time": "2026-07-25 07:22:00",
   "seed_lat": 68.97917,
   "seed_lon": 68.16667,
   "seed_alt_m": 12990.0,
   "seed_age_h": 219.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 05:45:00",
    "lat": 63.31512,
    "lon": -29.05279,
    "alt_m": 12708.4
   },
   "member_spread_deg": {
    "lat": 18.93,
    "lon": 271.19
   },
   "member_spread_now_deg": {
    "lat": 28.83,
    "lon": 195.56
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DG2GG-27",
   "flight_id": "DG2GG-27_2026-07-04",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 01:50:30",
   "seed_lat": 20.375,
   "seed_lon": -154.25,
   "seed_alt_m": 13920.0,
   "seed_age_h": 9.49,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-10 05:45:00",
    "lat": 43.09603,
    "lon": -68.41316,
    "alt_m": 13822.2
   },
   "member_spread_deg": {
    "lat": 28.09,
    "lon": 76.21
   },
   "member_spread_now_deg": {
    "lat": 3.99,
    "lon": 3.18
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-29",
   "flight_id": "DG2GG-29_2026-07-28",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 06:37:00",
   "seed_lat": 43.10417,
   "seed_lon": 148.0,
   "seed_alt_m": 13210.0,
   "seed_age_h": 4.72,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 06:00:00",
    "lat": 21.86517,
    "lon": -141.99392,
    "alt_m": 13553.3
   },
   "member_spread_deg": {
    "lat": 32.83,
    "lon": 298.43
   },
   "member_spread_now_deg": {
    "lat": 2.56,
    "lon": 0.44
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DJ2DS-34",
   "flight_id": "DJ2DS-34_2026-04-22",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 14:41:00",
   "seed_lat": 30.70833,
   "seed_lon": -70.5,
   "seed_alt_m": 9190.0,
   "seed_age_h": 140.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-10 05:45:00",
    "lat": 27.25782,
    "lon": 12.96748,
    "alt_m": 9178.8
   },
   "member_spread_deg": {
    "lat": 24.67,
    "lon": 140.45
   },
   "member_spread_now_deg": {
    "lat": 48.18,
    "lon": 112.05
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DL0MMZ",
   "flight_id": "DL0MMZ_2026-07-24",
   "payload_type": "OTHER",
   "seed_time": "2026-07-25 15:59:04",
   "seed_lat": 36.60802,
   "seed_lon": 30.46457,
   "seed_alt_m": 8441.0,
   "seed_age_h": 211.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-10 05:30:00",
    "lat": 46.99668,
    "lon": -38.00426,
    "alt_m": 8640.0
   },
   "member_spread_deg": {
    "lat": 22.68,
    "lon": 136.27
   },
   "member_spread_now_deg": {
    "lat": 29.56,
    "lon": 300.27
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DL0MZ-493",
   "flight_id": "DL0MZ-493_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 07:36:01",
   "seed_lat": 64.20833,
   "seed_lon": 58.16667,
   "seed_alt_m": 12170.0,
   "seed_age_h": 123.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-10 05:30:00",
    "lat": 44.93867,
    "lon": 28.58354,
    "alt_m": 12346.5
   },
   "member_spread_deg": {
    "lat": 33.15,
    "lon": 224.17
   },
   "member_spread_now_deg": {
    "lat": 19.67,
    "lon": 346.96
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DL0MZ-493e",
   "flight_id": "DL0MZ-493e_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 07:27:02",
   "seed_lat": 64.15625,
   "seed_lon": 58.08889,
   "seed_alt_m": 12170.0,
   "seed_age_h": 123.88,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-10 05:30:00",
    "lat": 56.45652,
    "lon": 33.24639,
    "alt_m": 12312.9
   },
   "member_spread_deg": {
    "lat": 33.96,
    "lon": 207.89
   },
   "member_spread_now_deg": {
    "lat": 20.45,
    "lon": 353.65
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 10:18:00",
   "seed_lat": 61.10417,
   "seed_lon": 103.33333,
   "seed_alt_m": 12370.0,
   "seed_age_h": 1.03,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-10 09:45:00",
    "lat": 72.25065,
    "lon": 45.78403,
    "alt_m": 11735.6
   },
   "member_spread_deg": {
    "lat": 33.21,
    "lon": 208.52
   },
   "member_spread_now_deg": {
    "lat": 0.4,
    "lon": 0.42
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DO3GU-40",
   "flight_id": "DO3GU-40_2026-06-19",
   "payload_type": "WSPR",
   "seed_time": "2026-07-24 12:15:47",
   "seed_lat": 71.20833,
   "seed_lon": 93.16667,
   "seed_alt_m": 15164.0,
   "seed_age_h": 239.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 05:45:00",
    "lat": 70.00753,
    "lon": -53.54787,
    "alt_m": 14983.5
   },
   "member_spread_deg": {
    "lat": 33.0,
    "lon": 308.42
   },
   "member_spread_now_deg": {
    "lat": 27.09,
    "lon": 263.26
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 05:43:00",
   "seed_lat": 51.47917,
   "seed_lon": 170.29167,
   "seed_alt_m": 12910.0,
   "seed_age_h": 5.62,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 05:45:00",
    "lat": 36.42954,
    "lon": -64.32667,
    "alt_m": 13548.2
   },
   "member_spread_deg": {
    "lat": 42.48,
    "lon": 147.18
   },
   "member_spread_now_deg": {
    "lat": 1.73,
    "lon": 358.98
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "K0PEA-28",
   "flight_id": "K0PEA-28_2026-01-07",
   "payload_type": "WSPR",
   "seed_time": "2026-07-23 12:15:25",
   "seed_lat": 49.85411,
   "seed_lon": 24.91668,
   "seed_alt_m": 13360.0,
   "seed_age_h": 263.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 05:45:00",
    "lat": 15.04784,
    "lon": -144.26159,
    "alt_m": 14436.7
   },
   "member_spread_deg": {
    "lat": 91.55,
    "lon": 270.13
   },
   "member_spread_now_deg": {
    "lat": 44.09,
    "lon": 323.44
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "K5NOT-11",
   "flight_id": "K5NOT-11_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 10:55:37",
   "seed_lat": 43.87494,
   "seed_lon": 23.0,
   "seed_alt_m": 13090.0,
   "seed_age_h": 0.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 11:00:00",
    "lat": 57.83955,
    "lon": 177.6192,
    "alt_m": 13253.5
   },
   "member_spread_deg": {
    "lat": 39.84,
    "lon": 354.17
   },
   "member_spread_now_deg": {
    "lat": 0.11,
    "lon": 0.1
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "K9YO-23",
   "flight_id": "K9YO-23_2026-07-13",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 06:25:49",
   "seed_lat": 52.5833,
   "seed_lon": 125.16663,
   "seed_alt_m": 12840.0,
   "seed_age_h": 172.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 05:30:00",
    "lat": 46.54784,
    "lon": 171.85135,
    "alt_m": 13131.7
   },
   "member_spread_deg": {
    "lat": 63.2,
    "lon": 340.52
   },
   "member_spread_now_deg": {
    "lat": 50.87,
    "lon": 301.08
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC3LBR-449",
   "flight_id": "KC3LBR-449_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 04:22:33",
   "seed_lat": 61.20833,
   "seed_lon": -118.58333,
   "seed_alt_m": 13270.0,
   "seed_age_h": 6.96,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 05:30:00",
    "lat": 61.69976,
    "lon": 35.36785,
    "alt_m": 13113.2
   },
   "member_spread_deg": {
    "lat": 10.57,
    "lon": 144.25
   },
   "member_spread_now_deg": {
    "lat": 3.66,
    "lon": 5.79
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KC3LBR-485",
   "flight_id": "KC3LBR-485_2026-03-19",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 09:08:18",
   "seed_lat": 50.14583,
   "seed_lon": 23.375,
   "seed_alt_m": 12850.0,
   "seed_age_h": 146.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 05:45:00",
    "lat": 75.15808,
    "lon": 146.78041,
    "alt_m": 12483.1
   },
   "member_spread_deg": {
    "lat": 45.36,
    "lon": 336.56
   },
   "member_spread_now_deg": {
    "lat": 8.31,
    "lon": 121.13
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC5TRB-1",
   "flight_id": "KC5TRB-1_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-02 11:30:43",
   "seed_lat": 67.33328,
   "seed_lon": 65.58336,
   "seed_alt_m": 12840.0,
   "seed_age_h": 23.82,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 05:30:00",
    "lat": 63.0716,
    "lon": -41.95605,
    "alt_m": 12519.4
   },
   "member_spread_deg": {
    "lat": 27.14,
    "lon": 352.37
   },
   "member_spread_now_deg": {
    "lat": 5.32,
    "lon": 22.75
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KD7FXO-1",
   "flight_id": "KD7FXO-1_2026-08-02",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 04:20:00",
   "seed_lat": 38.91667,
   "seed_lon": -156.20833,
   "seed_alt_m": 13020.0,
   "seed_age_h": 7.0,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 05:45:00",
    "lat": 38.55484,
    "lon": -15.53447,
    "alt_m": 13074.3
   },
   "member_spread_deg": {
    "lat": 40.47,
    "lon": 149.48
   },
   "member_spread_now_deg": {
    "lat": 1.71,
    "lon": 0.7
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KE8RES-8",
   "flight_id": "KE8RES-8_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-02 23:48:30",
   "seed_lat": 53.97917,
   "seed_lon": -116.875,
   "seed_alt_m": 12230.0,
   "seed_age_h": 11.53,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-10 05:45:00",
    "lat": 60.66756,
    "lon": -83.38051,
    "alt_m": 12073.1
   },
   "member_spread_deg": {
    "lat": 8.94,
    "lon": 56.58
   },
   "member_spread_now_deg": {
    "lat": 0.95,
    "lon": 0.68
   },
   "display_as": "track",
   "display_reason": "fresh"
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  },
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  },
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  },
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   "flight_id": "N0MPM-31_2026-04-16",
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  },
  {
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  },
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  },
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   "seed_time": "2026-07-22 14:00:27",
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  },
  {
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  },
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  },
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  {
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  }
 ]
}