{
 "generated_utc": "2026-07-29T11:27:55Z",
 "gfs_cycle_utc": "2026-07-29T06:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 477.5,
  "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_20260729_06Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260729_06Z.geojson.gz"
 },
 "counts": {
  "flights": 51,
  "members": 9,
  "rows": 259002
 },
 "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": 299.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-05 05:45:00",
    "lat": 44.85414,
    "lon": 51.8198,
    "alt_m": 12049.0
   },
   "member_spread_deg": {
    "lat": 72.21,
    "lon": 259.11
   },
   "member_spread_now_deg": {
    "lat": 77.9,
    "lon": 314.11
   },
   "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": 315.33,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 05:30:00",
    "lat": 16.28789,
    "lon": -21.86903,
    "alt_m": 13028.6
   },
   "member_spread_deg": {
    "lat": 46.51,
    "lon": 278.27
   },
   "member_spread_now_deg": {
    "lat": 39.07,
    "lon": 202.19
   },
   "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": 249.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 05:45:00",
    "lat": 27.01859,
    "lon": -108.23486,
    "alt_m": 14306.9
   },
   "member_spread_deg": {
    "lat": 48.66,
    "lon": 109.48
   },
   "member_spread_now_deg": {
    "lat": 36.33,
    "lon": 50.26
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 09:28:40",
   "seed_lat": -51.70834,
   "seed_lon": 96.37501,
   "seed_alt_m": 12120.0,
   "seed_age_h": 1.86,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-05 09:00:00",
    "lat": -46.24998,
    "lon": -21.30527,
    "alt_m": 12621.1
   },
   "member_spread_deg": {
    "lat": 42.37,
    "lon": 62.16
   },
   "member_spread_now_deg": {
    "lat": 0.09,
    "lon": 1.41
   },
   "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": 113.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 05:45:00",
    "lat": 66.93456,
    "lon": -106.11303,
    "alt_m": 12851.5
   },
   "member_spread_deg": {
    "lat": 41.28,
    "lon": 341.39
   },
   "member_spread_now_deg": {
    "lat": 28.58,
    "lon": 80.41
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 10:57:18",
   "seed_lat": 56.5625,
   "seed_lon": 11.875,
   "seed_alt_m": 12800.0,
   "seed_age_h": 0.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 11:00:00",
    "lat": 43.10933,
    "lon": 162.3392,
    "alt_m": 13126.7
   },
   "member_spread_deg": {
    "lat": 42.67,
    "lon": 96.67
   },
   "member_spread_now_deg": {
    "lat": 0.03,
    "lon": 0.06
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 00:28:47",
   "seed_lat": 46.66667,
   "seed_lon": -89.875,
   "seed_alt_m": 14080.0,
   "seed_age_h": 10.85,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-05 05:30:00",
    "lat": 29.60671,
    "lon": -34.78742,
    "alt_m": 14447.4
   },
   "member_spread_deg": {
    "lat": 36.41,
    "lon": 228.44
   },
   "member_spread_now_deg": {
    "lat": 3.69,
    "lon": 5.48
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 03:49:00",
   "seed_lat": 35.04167,
   "seed_lon": -163.625,
   "seed_alt_m": 13110.0,
   "seed_age_h": 7.52,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 05:45:00",
    "lat": 44.82642,
    "lon": -120.24665,
    "alt_m": 12893.9
   },
   "member_spread_deg": {
    "lat": 23.23,
    "lon": 325.57
   },
   "member_spread_now_deg": {
    "lat": 0.68,
    "lon": 3.83
   },
   "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": 99.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 05:45:00",
    "lat": 69.6128,
    "lon": -23.19778,
    "alt_m": 12726.7
   },
   "member_spread_deg": {
    "lat": 24.42,
    "lon": 213.73
   },
   "member_spread_now_deg": {
    "lat": 22.01,
    "lon": 329.3
   },
   "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": 27.87,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 05:30:00",
    "lat": 68.72192,
    "lon": -42.59159,
    "alt_m": 13173.2
   },
   "member_spread_deg": {
    "lat": 49.67,
    "lon": 342.19
   },
   "member_spread_now_deg": {
    "lat": 13.11,
    "lon": 15.82
   },
   "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": 20.65,
   "float_reliable": false,
   "dead_reckoned": false,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-05 05:45:00",
    "lat": 44.28918,
    "lon": 71.51135,
    "alt_m": 9344.3
   },
   "member_spread_deg": {
    "lat": 24.3,
    "lon": 125.43
   },
   "member_spread_now_deg": {
    "lat": 7.75,
    "lon": 6.88
   },
   "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": 91.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-05 05:30:00",
    "lat": 45.8216,
    "lon": -124.09148,
    "alt_m": 8680.3
   },
   "member_spread_deg": {
    "lat": 44.35,
    "lon": 327.71
   },
   "member_spread_now_deg": {
    "lat": 23.57,
    "lon": 24.89
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "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": 3.73,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-05 07:00:00",
    "lat": 51.96076,
    "lon": -135.03377,
    "alt_m": 12670.5
   },
   "member_spread_deg": {
    "lat": 18.54,
    "lon": 331.39
   },
   "member_spread_now_deg": {
    "lat": 0.81,
    "lon": 2.05
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 3.88,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-05 07:00:00",
    "lat": 52.09819,
    "lon": -135.25046,
    "alt_m": 12672.3
   },
   "member_spread_deg": {
    "lat": 17.89,
    "lon": 330.47
   },
   "member_spread_now_deg": {
    "lat": 0.9,
    "lon": 2.26
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 10:53:00",
   "seed_lat": 49.33333,
   "seed_lon": -26.0,
   "seed_alt_m": 12520.0,
   "seed_age_h": 0.45,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 11:00:00",
    "lat": 73.83089,
    "lon": -120.99723,
    "alt_m": 12591.1
   },
   "member_spread_deg": {
    "lat": 17.33,
    "lon": 313.76
   },
   "member_spread_now_deg": {
    "lat": 0.09,
    "lon": 0.07
   },
   "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": 119.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 05:45:00",
    "lat": 87.97693,
    "lon": -40.47544,
    "alt_m": 14671.7
   },
   "member_spread_deg": {
    "lat": 33.73,
    "lon": 308.48
   },
   "member_spread_now_deg": {
    "lat": 5.97,
    "lon": 301.37
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 10:48:00",
   "seed_lat": 76.27083,
   "seed_lon": 47.45833,
   "seed_alt_m": 12600.0,
   "seed_age_h": 0.53,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 10:15:00",
    "lat": 64.04598,
    "lon": -127.8064,
    "alt_m": 12617.2
   },
   "member_spread_deg": {
    "lat": 27.13,
    "lon": 62.8
   },
   "member_spread_now_deg": {
    "lat": 0.19,
    "lon": 0.69
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 143.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 05:45:00",
    "lat": 44.64754,
    "lon": 163.38648,
    "alt_m": 13883.8
   },
   "member_spread_deg": {
    "lat": 40.58,
    "lon": 240.93
   },
   "member_spread_now_deg": {
    "lat": 21.46,
    "lon": 279.61
   },
   "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 19:05:37",
   "seed_lat": 48.83328,
   "seed_lon": -42.83333,
   "seed_alt_m": 13180.0,
   "seed_age_h": 16.24,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 05:30:00",
    "lat": 42.0531,
    "lon": 107.69555,
    "alt_m": 13013.1
   },
   "member_spread_deg": {
    "lat": 55.58,
    "lon": 167.01
   },
   "member_spread_now_deg": {
    "lat": 13.08,
    "lon": 3.42
   },
   "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": 52.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 05:30:00",
    "lat": -27.52719,
    "lon": 124.18544,
    "alt_m": 12983.5
   },
   "member_spread_deg": {
    "lat": 69.94,
    "lon": 257.43
   },
   "member_spread_now_deg": {
    "lat": 17.13,
    "lon": 32.68
   },
   "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": 229.38,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 05:30:00",
    "lat": -29.83801,
    "lon": 143.28322,
    "alt_m": 14251.9
   },
   "member_spread_deg": {
    "lat": 29.79,
    "lon": 333.11
   },
   "member_spread_now_deg": {
    "lat": 14.16,
    "lon": 343.61
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC3LBR-449",
   "flight_id": "KC3LBR-449_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 10:47:18",
   "seed_lat": 71.5625,
   "seed_lon": 156.625,
   "seed_alt_m": 13150.0,
   "seed_age_h": 0.55,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 10:15:00",
    "lat": 72.32545,
    "lon": -44.39288,
    "alt_m": 13407.9
   },
   "member_spread_deg": {
    "lat": 27.84,
    "lon": 238.9
   },
   "member_spread_now_deg": {
    "lat": 0.03,
    "lon": 0.12
   },
   "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": 26.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 05:45:00",
    "lat": 50.01254,
    "lon": 76.7743,
    "alt_m": 12961.3
   },
   "member_spread_deg": {
    "lat": 23.14,
    "lon": 357.53
   },
   "member_spread_now_deg": {
    "lat": 7.06,
    "lon": 6.09
   },
   "display_as": "track",
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  },
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   "flight_id": "ZS6SRC-37_2026-07-15",
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   },
   "display_as": "track",
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  },
  {
   "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,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
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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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   "seed_age_h": 225.45,
   "float_reliable": true,
   "dead_reckoned": true,
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   "nominal_end": {
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   "member_spread_deg": {
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   "member_spread_now_deg": {
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    "lon": 300.18
   },
   "display_as": "region",
   "display_reason": "member_spread"
  }
 ]
}