{
 "generated_utc": "2026-07-29T17:28:10Z",
 "gfs_cycle_utc": "2026-07-29T12:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 483.5,
  "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_12Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260729_12Z.geojson.gz"
 },
 "counts": {
  "flights": 51,
  "members": 9,
  "rows": 263097
 },
 "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": 305.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-05 11:45:00",
    "lat": 25.24535,
    "lon": -7.89238,
    "alt_m": 12255.8
   },
   "member_spread_deg": {
    "lat": 75.62,
    "lon": 261.32
   },
   "member_spread_now_deg": {
    "lat": 79.81,
    "lon": 311.25
   },
   "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": 321.33,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 11:30:00",
    "lat": 21.77041,
    "lon": -28.02063,
    "alt_m": 13050.3
   },
   "member_spread_deg": {
    "lat": 52.45,
    "lon": 286.88
   },
   "member_spread_now_deg": {
    "lat": 37.3,
    "lon": 205.29
   },
   "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": 255.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 11:45:00",
    "lat": 30.73406,
    "lon": -100.90128,
    "alt_m": 14177.5
   },
   "member_spread_deg": {
    "lat": 47.36,
    "lon": 86.94
   },
   "member_spread_now_deg": {
    "lat": 37.01,
    "lon": 51.18
   },
   "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": 7.86,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-05 11:30:00",
    "lat": -43.0673,
    "lon": -4.85824,
    "alt_m": 12664.4
   },
   "member_spread_deg": {
    "lat": 22.17,
    "lon": 112.9
   },
   "member_spread_now_deg": {
    "lat": 0.61,
    "lon": 5.54
   },
   "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": 119.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 11:45:00",
    "lat": 57.29638,
    "lon": -126.45144,
    "alt_m": 13220.6
   },
   "member_spread_deg": {
    "lat": 32.73,
    "lon": 327.48
   },
   "member_spread_now_deg": {
    "lat": 26.7,
    "lon": 84.22
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 12:50:18",
   "seed_lat": 56.52083,
   "seed_lon": 13.66667,
   "seed_alt_m": 12770.0,
   "seed_age_h": 4.5,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 12:15:00",
    "lat": 55.54959,
    "lon": 158.91106,
    "alt_m": 12949.5
   },
   "member_spread_deg": {
    "lat": 35.95,
    "lon": 305.06
   },
   "member_spread_now_deg": {
    "lat": 0.39,
    "lon": 0.92
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 17:01:33",
   "seed_lat": 36.89583,
   "seed_lon": -77.625,
   "seed_alt_m": 14170.0,
   "seed_age_h": 0.31,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 17:00:00",
    "lat": 40.94481,
    "lon": -4.75577,
    "alt_m": 14275.8
   },
   "member_spread_deg": {
    "lat": 20.26,
    "lon": 124.69
   },
   "member_spread_now_deg": {
    "lat": 0.0,
    "lon": 0.31
   },
   "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": 13.52,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 11:45:00",
    "lat": 46.76706,
    "lon": -131.58248,
    "alt_m": 12917.6
   },
   "member_spread_deg": {
    "lat": 16.42,
    "lon": 331.39
   },
   "member_spread_now_deg": {
    "lat": 2.56,
    "lon": 6.33
   },
   "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": 105.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 11:45:00",
    "lat": 75.18275,
    "lon": -27.12091,
    "alt_m": 12721.2
   },
   "member_spread_deg": {
    "lat": 30.14,
    "lon": 203.83
   },
   "member_spread_now_deg": {
    "lat": 22.21,
    "lon": 326.12
   },
   "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": 33.87,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 11:30:00",
    "lat": 45.00743,
    "lon": -119.49635,
    "alt_m": 13489.0
   },
   "member_spread_deg": {
    "lat": 41.73,
    "lon": 344.17
   },
   "member_spread_now_deg": {
    "lat": 15.92,
    "lon": 19.54
   },
   "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": 26.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-05 11:45:00",
    "lat": 28.92584,
    "lon": 9.59138,
    "alt_m": 9290.5
   },
   "member_spread_deg": {
    "lat": 24.85,
    "lon": 152.46
   },
   "member_spread_now_deg": {
    "lat": 9.09,
    "lon": 13.3
   },
   "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": 97.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-05 11:30:00",
    "lat": 60.60977,
    "lon": -116.6431,
    "alt_m": 8566.6
   },
   "member_spread_deg": {
    "lat": 47.76,
    "lon": 343.33
   },
   "member_spread_now_deg": {
    "lat": 24.61,
    "lon": 25.93
   },
   "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": 9.73,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-05 11:30:00",
    "lat": 66.79444,
    "lon": -123.02294,
    "alt_m": 12226.5
   },
   "member_spread_deg": {
    "lat": 31.07,
    "lon": 314.19
   },
   "member_spread_now_deg": {
    "lat": 1.73,
    "lon": 7.17
   },
   "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": 9.88,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-05 11:30:00",
    "lat": 66.57222,
    "lon": -124.6048,
    "alt_m": 12213.9
   },
   "member_spread_deg": {
    "lat": 29.04,
    "lon": 317.93
   },
   "member_spread_now_deg": {
    "lat": 1.85,
    "lon": 7.35
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 16:53:00",
   "seed_lat": 48.77083,
   "seed_lon": -21.125,
   "seed_alt_m": 12560.0,
   "seed_age_h": 0.45,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 17:00:00",
    "lat": 82.93397,
    "lon": 127.72788,
    "alt_m": 11729.7
   },
   "member_spread_deg": {
    "lat": 19.81,
    "lon": 249.94
   },
   "member_spread_now_deg": {
    "lat": 0.09,
    "lon": 0.09
   },
   "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": 125.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 11:45:00",
    "lat": 79.8894,
    "lon": -66.66807,
    "alt_m": 14941.1
   },
   "member_spread_deg": {
    "lat": 17.74,
    "lon": 279.89
   },
   "member_spread_now_deg": {
    "lat": 5.68,
    "lon": 300.7
   },
   "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 14:28:00",
   "seed_lat": 76.77083,
   "seed_lon": 54.83333,
   "seed_alt_m": 12600.0,
   "seed_age_h": 2.87,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 14:00:00",
    "lat": 68.41155,
    "lon": -129.08586,
    "alt_m": 12595.1
   },
   "member_spread_deg": {
    "lat": 35.65,
    "lon": 94.47
   },
   "member_spread_now_deg": {
    "lat": 0.61,
    "lon": 7.58
   },
   "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": 149.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 11:45:00",
    "lat": 48.61212,
    "lon": 167.28868,
    "alt_m": 13877.4
   },
   "member_spread_deg": {
    "lat": 54.49,
    "lon": 343.36
   },
   "member_spread_now_deg": {
    "lat": 17.18,
    "lon": 284.6
   },
   "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": 22.24,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 11:30:00",
    "lat": 50.8399,
    "lon": 118.36263,
    "alt_m": 13044.9
   },
   "member_spread_deg": {
    "lat": 32.39,
    "lon": 130.07
   },
   "member_spread_now_deg": {
    "lat": 13.46,
    "lon": 5.92
   },
   "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": 58.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 11:30:00",
    "lat": 40.55219,
    "lon": 148.12025,
    "alt_m": 13177.3
   },
   "member_spread_deg": {
    "lat": 65.83,
    "lon": 279.78
   },
   "member_spread_now_deg": {
    "lat": 19.85,
    "lon": 40.18
   },
   "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": 235.38,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 11:30:00",
    "lat": -29.1689,
    "lon": 139.20367,
    "alt_m": 14377.8
   },
   "member_spread_deg": {
    "lat": 38.17,
    "lon": 343.83
   },
   "member_spread_now_deg": {
    "lat": 18.34,
    "lon": 341.82
   },
   "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 16:57:04",
   "seed_lat": 71.27083,
   "seed_lon": 162.95833,
   "seed_alt_m": 13100.0,
   "seed_age_h": 0.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 17:00:00",
    "lat": 53.92572,
    "lon": -101.63499,
    "alt_m": 13342.4
   },
   "member_spread_deg": {
    "lat": 39.32,
    "lon": 246.76
   },
   "member_spread_now_deg": {
    "lat": 0.04,
    "lon": 0.22
   },
   "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": 32.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 11:45:00",
    "lat": 51.25805,
    "lon": 79.36992,
    "alt_m": 12989.4
   },
   "member_spread_deg": {
    "lat": 25.07,
    "lon": 254.42
   },
   "member_spread_now_deg": {
    "lat": 8.23,
    "lon": 6.91
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   "display_as": "track",
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  },
  {
   "callsign": "ZS6SRC-84",
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  },
  {
   "callsign": "ZS6ZU-11",
   "flight_id": "ZS6ZU-11_2026-07-17",
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   "seed_time": "2026-07-20 01:53:00",
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   "seed_lon": -151.29167,
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   "member_spread_now_deg": {
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   "display_as": "region",
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  }
 ]
}