{
 "generated_utc": "2026-07-28T16:25:17Z",
 "gfs_cycle_utc": "2026-07-28T06:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 488.5,
  "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_20260728_06Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260728_06Z.geojson.gz"
 },
 "counts": {
  "flights": 51,
  "members": 9,
  "rows": 260424
 },
 "flights": [
  {
   "callsign": "9A1CTF-16",
   "flight_id": "9A1CTF-16_2026-07-10",
   "payload_type": "WSPR",
   "seed_time": "2026-07-16 23:22:00",
   "seed_lat": 22.83333,
   "seed_lon": 138.79167,
   "seed_alt_m": 12180.0,
   "seed_age_h": 280.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-04 05:45:00",
    "lat": 9.17842,
    "lon": -26.16359,
    "alt_m": 12268.7
   },
   "member_spread_deg": {
    "lat": 96.77,
    "lon": 256.59
   },
   "member_spread_now_deg": {
    "lat": 79.23,
    "lon": 355.87
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "9A1CTF-18",
   "flight_id": "9A1CTF-18_2026-07-10",
   "payload_type": "WSPR",
   "seed_time": "2026-07-16 08:00:00",
   "seed_lat": 26.92359,
   "seed_lon": 141.2035,
   "seed_alt_m": 12930.0,
   "seed_age_h": 296.27,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 05:30:00",
    "lat": -5.63761,
    "lon": -26.50307,
    "alt_m": 13040.7
   },
   "member_spread_deg": {
    "lat": 41.68,
    "lon": 277.32
   },
   "member_spread_now_deg": {
    "lat": 44.42,
    "lon": 224.74
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "AE0SS-9",
   "flight_id": "AE0SS-9_2026-07-12",
   "payload_type": "APRS",
   "seed_time": "2026-07-19 01:40:35",
   "seed_lat": 33.85425,
   "seed_lon": -115.42858,
   "seed_alt_m": 14321.0,
   "seed_age_h": 230.6,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 05:45:00",
    "lat": 29.86653,
    "lon": -115.1586,
    "alt_m": 14362.6
   },
   "member_spread_deg": {
    "lat": 47.89,
    "lon": 98.56
   },
   "member_spread_now_deg": {
    "lat": 46.22,
    "lon": 43.93
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 12:33:40",
   "seed_lat": -53.39584,
   "seed_lon": 48.16668,
   "seed_alt_m": 12420.0,
   "seed_age_h": 3.71,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 12:00:00",
    "lat": -50.14898,
    "lon": -58.30504,
    "alt_m": 12609.3
   },
   "member_spread_deg": {
    "lat": 34.67,
    "lon": 142.35
   },
   "member_spread_now_deg": {
    "lat": 0.11,
    "lon": 2.01
   },
   "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": 94.61,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 05:45:00",
    "lat": 79.74948,
    "lon": -114.58619,
    "alt_m": 12589.6
   },
   "member_spread_deg": {
    "lat": 69.11,
    "lon": 335.42
   },
   "member_spread_now_deg": {
    "lat": 20.49,
    "lon": 54.73
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 15:54:18",
   "seed_lat": 50.85417,
   "seed_lon": -12.83333,
   "seed_alt_m": 12800.0,
   "seed_age_h": 0.37,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 16:00:00",
    "lat": 54.64121,
    "lon": 115.96848,
    "alt_m": 12778.3
   },
   "member_spread_deg": {
    "lat": 16.13,
    "lon": 69.91
   },
   "member_spread_now_deg": {
    "lat": 0.1,
    "lon": 0.08
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 15:59:18",
   "seed_lat": 50.97917,
   "seed_lon": -98.83333,
   "seed_alt_m": 14110.0,
   "seed_age_h": 0.28,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-04 16:00:00",
    "lat": 23.71878,
    "lon": -47.78011,
    "alt_m": 14492.2
   },
   "member_spread_deg": {
    "lat": 35.54,
    "lon": 216.2
   },
   "member_spread_now_deg": {
    "lat": 0.11,
    "lon": 0.23
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 02:21:30",
   "seed_lat": 39.95833,
   "seed_lon": -158.58333,
   "seed_alt_m": 12880.0,
   "seed_age_h": 13.91,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 05:45:00",
    "lat": 30.86764,
    "lon": -169.7041,
    "alt_m": 13096.0
   },
   "member_spread_deg": {
    "lat": 21.26,
    "lon": 127.72
   },
   "member_spread_now_deg": {
    "lat": 3.53,
    "lon": 5.41
   },
   "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": 80.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 05:45:00",
    "lat": 70.47918,
    "lon": -86.80029,
    "alt_m": 12796.1
   },
   "member_spread_deg": {
    "lat": 37.19,
    "lon": 189.96
   },
   "member_spread_now_deg": {
    "lat": 17.17,
    "lon": 343.46
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DG2GG-27",
   "flight_id": "DG2GG-27_2026-07-04",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 07:28:00",
   "seed_lat": 55.9375,
   "seed_lon": 130.41667,
   "seed_alt_m": 13230.0,
   "seed_age_h": 8.8,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 07:00:00",
    "lat": 58.33322,
    "lon": -70.42383,
    "alt_m": 13278.0
   },
   "member_spread_deg": {
    "lat": 61.34,
    "lon": 93.95
   },
   "member_spread_now_deg": {
    "lat": 3.71,
    "lon": 1.14
   },
   "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": 1.59,
   "float_reliable": false,
   "dead_reckoned": false,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-04 14:15:00",
    "lat": 31.93965,
    "lon": -1.74556,
    "alt_m": 9461.1
   },
   "member_spread_deg": {
    "lat": 34.21,
    "lon": 88.16
   },
   "member_spread_now_deg": {
    "lat": 0.21,
    "lon": 0.12
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 72.29,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-04 05:30:00",
    "lat": 66.48957,
    "lon": 157.79909,
    "alt_m": 8521.9
   },
   "member_spread_deg": {
    "lat": 43.24,
    "lon": 351.12
   },
   "member_spread_now_deg": {
    "lat": 25.07,
    "lon": 11.57
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "DL0MZ-493",
   "flight_id": "DL0MZ-493_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 16:06:01",
   "seed_lat": 49.625,
   "seed_lon": 25.08333,
   "seed_alt_m": 12400.0,
   "seed_age_h": 48.17,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-04 05:30:00",
    "lat": 66.28374,
    "lon": -155.07596,
    "alt_m": 12196.3
   },
   "member_spread_deg": {
    "lat": 25.0,
    "lon": 328.27
   },
   "member_spread_now_deg": {
    "lat": 5.12,
    "lon": 16.19
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DL0MZ-493e",
   "flight_id": "DL0MZ-493e_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 16:06:02",
   "seed_lat": 49.63134,
   "seed_lon": 25.11007,
   "seed_alt_m": 12400.0,
   "seed_age_h": 48.17,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-04 05:30:00",
    "lat": 66.4096,
    "lon": -154.90656,
    "alt_m": 12197.5
   },
   "member_spread_deg": {
    "lat": 25.32,
    "lon": 338.01
   },
   "member_spread_now_deg": {
    "lat": 4.83,
    "lon": 15.9
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 15:53:00",
   "seed_lat": 58.5625,
   "seed_lon": -39.58333,
   "seed_alt_m": 12450.0,
   "seed_age_h": 0.39,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 16:00:00",
    "lat": 64.0944,
    "lon": 82.09722,
    "alt_m": 12308.4
   },
   "member_spread_deg": {
    "lat": 27.21,
    "lon": 155.9
   },
   "member_spread_now_deg": {
    "lat": 0.16,
    "lon": 0.04
   },
   "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": 100.01,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 05:45:00",
    "lat": 85.29381,
    "lon": -113.07435,
    "alt_m": 14823.1
   },
   "member_spread_deg": {
    "lat": 40.09,
    "lon": 267.69
   },
   "member_spread_now_deg": {
    "lat": 8.41,
    "lon": 319.12
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 08:23:00",
   "seed_lat": 66.16667,
   "seed_lon": 33.04167,
   "seed_alt_m": 12700.0,
   "seed_age_h": 7.89,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 08:00:00",
    "lat": 51.61467,
    "lon": -132.17818,
    "alt_m": 13154.7
   },
   "member_spread_deg": {
    "lat": 21.0,
    "lon": 50.8
   },
   "member_spread_now_deg": {
    "lat": 0.95,
    "lon": 0.72
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EOSSP-2",
   "flight_id": "EOSSP-2_2026-02-01",
   "payload_type": "WSPR",
   "seed_time": "2026-07-14 21:21:33",
   "seed_lat": 42.27078,
   "seed_lon": 149.50001,
   "seed_alt_m": 14180.0,
   "seed_age_h": 330.91,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 05:45:00",
    "lat": 33.13517,
    "lon": -92.34826,
    "alt_m": 14404.1
   },
   "member_spread_deg": {
    "lat": 59.82,
    "lon": 313.83
   },
   "member_spread_now_deg": {
    "lat": 60.43,
    "lon": 224.17
   },
   "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": 124.01,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 05:45:00",
    "lat": 58.57884,
    "lon": 143.69022,
    "alt_m": 13545.4
   },
   "member_spread_deg": {
    "lat": 41.57,
    "lon": 337.3
   },
   "member_spread_now_deg": {
    "lat": 19.61,
    "lon": 274.49
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "K5NOT-11",
   "flight_id": "K5NOT-11_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 15:55:37",
   "seed_lat": 48.39578,
   "seed_lon": -49.29167,
   "seed_alt_m": 13120.0,
   "seed_age_h": 0.34,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 16:00:00",
    "lat": 42.03194,
    "lon": 75.14368,
    "alt_m": 13094.3
   },
   "member_spread_deg": {
    "lat": 29.8,
    "lon": 181.67
   },
   "member_spread_now_deg": {
    "lat": 0.14,
    "lon": 0.74
   },
   "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": 33.84,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 05:30:00",
    "lat": 31.44784,
    "lon": 141.11455,
    "alt_m": 13073.3
   },
   "member_spread_deg": {
    "lat": 54.37,
    "lon": 312.13
   },
   "member_spread_now_deg": {
    "lat": 7.42,
    "lon": 18.51
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KC3LBR-422-10",
   "flight_id": "KC3LBR-422-10_2026-01-02",
   "payload_type": "WSPR",
   "seed_time": "2026-07-19 21:57:02",
   "seed_lat": -26.39583,
   "seed_lon": -68.16667,
   "seed_alt_m": 14380.0,
   "seed_age_h": 210.32,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 05:30:00",
    "lat": -32.14641,
    "lon": 57.71151,
    "alt_m": 14400.5
   },
   "member_spread_deg": {
    "lat": 37.61,
    "lon": 251.53
   },
   "member_spread_now_deg": {
    "lat": 11.51,
    "lon": 308.46
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC3LBR-449",
   "flight_id": "KC3LBR-449_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 15:57:03",
   "seed_lat": 75.16667,
   "seed_lon": 137.5,
   "seed_alt_m": 13100.0,
   "seed_age_h": 0.32,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-04 16:00:00",
    "lat": 70.78459,
    "lon": -78.57329,
    "alt_m": 13275.2
   },
   "member_spread_deg": {
    "lat": 29.09,
    "lon": 265.99
   },
   "member_spread_now_deg": {
    "lat": 0.12,
    "lon": 0.09
   },
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  },
  {
   "callsign": "ZS6SRC-37",
   "flight_id": "ZS6SRC-37_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-07-14 23:39:00",
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   "seed_lon": -136.75,
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   "float_reliable": true,
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   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "ZS6SRC-84",
   "flight_id": "ZS6SRC-84_2026-07-12",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 15:20:00",
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   "seed_lon": 8.375,
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   "float_reliable": true,
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   "nominal_end": {
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   "member_spread_deg": {
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   "display_as": "track",
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  },
  {
   "callsign": "ZS6ZU-11",
   "flight_id": "ZS6ZU-11_2026-07-17",
   "payload_type": "WSPR",
   "seed_time": "2026-07-20 01:53:00",
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   "seed_lon": -151.29167,
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   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
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   "member_spread_deg": {
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   "display_as": "region",
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  }
 ]
}