{
 "generated_utc": "2026-07-29T23:28:11Z",
 "gfs_cycle_utc": "2026-07-29T18:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 489.5,
  "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_18Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260729_18Z.geojson.gz"
 },
 "counts": {
  "flights": 51,
  "members": 9,
  "rows": 266742
 },
 "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": 311.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-05 17:45:00",
    "lat": 39.41767,
    "lon": 76.91656,
    "alt_m": 11980.1
   },
   "member_spread_deg": {
    "lat": 66.73,
    "lon": 205.51
   },
   "member_spread_now_deg": {
    "lat": 81.06,
    "lon": 309.93
   },
   "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": 327.33,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 17:30:00",
    "lat": 20.43642,
    "lon": -31.42037,
    "alt_m": 13029.8
   },
   "member_spread_deg": {
    "lat": 48.24,
    "lon": 334.72
   },
   "member_spread_now_deg": {
    "lat": 37.05,
    "lon": 209.15
   },
   "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": 261.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 17:45:00",
    "lat": 31.39877,
    "lon": -99.0011,
    "alt_m": 14288.0
   },
   "member_spread_deg": {
    "lat": 60.9,
    "lon": 151.2
   },
   "member_spread_now_deg": {
    "lat": 39.85,
    "lon": 52.06
   },
   "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": 13.86,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-05 17:30:00",
    "lat": -44.59795,
    "lon": 18.45003,
    "alt_m": 12468.7
   },
   "member_spread_deg": {
    "lat": 22.79,
    "lon": 66.12
   },
   "member_spread_now_deg": {
    "lat": 1.58,
    "lon": 13.76
   },
   "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": 125.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 17:45:00",
    "lat": 55.29172,
    "lon": -130.24537,
    "alt_m": 13306.5
   },
   "member_spread_deg": {
    "lat": 28.4,
    "lon": 329.61
   },
   "member_spread_now_deg": {
    "lat": 25.07,
    "lon": 84.74
   },
   "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": 10.5,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 17:45:00",
    "lat": 49.03129,
    "lon": 161.37905,
    "alt_m": 12765.7
   },
   "member_spread_deg": {
    "lat": 20.29,
    "lon": 337.9
   },
   "member_spread_now_deg": {
    "lat": 1.29,
    "lon": 1.54
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 21:52:33",
   "seed_lat": 37.5,
   "seed_lon": -74.0,
   "seed_alt_m": 14050.0,
   "seed_age_h": 1.46,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-05 21:30:00",
    "lat": 37.94646,
    "lon": -12.1547,
    "alt_m": 14226.9
   },
   "member_spread_deg": {
    "lat": 30.7,
    "lon": 137.34
   },
   "member_spread_now_deg": {
    "lat": 0.5,
    "lon": 0.97
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 21:54:00",
   "seed_lat": 30.9375,
   "seed_lon": -165.16667,
   "seed_alt_m": 13140.0,
   "seed_age_h": 1.43,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 21:30:00",
    "lat": 51.36943,
    "lon": -33.92074,
    "alt_m": 13090.0
   },
   "member_spread_deg": {
    "lat": 36.28,
    "lon": 62.54
   },
   "member_spread_now_deg": {
    "lat": 0.26,
    "lon": 0.28
   },
   "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": 111.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 17:45:00",
    "lat": 71.57005,
    "lon": -9.14623,
    "alt_m": 12916.5
   },
   "member_spread_deg": {
    "lat": 26.92,
    "lon": 318.23
   },
   "member_spread_now_deg": {
    "lat": 23.11,
    "lon": 327.92
   },
   "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": 39.87,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 17:30:00",
    "lat": 23.28074,
    "lon": -141.84084,
    "alt_m": 13686.4
   },
   "member_spread_deg": {
    "lat": 58.27,
    "lon": 357.15
   },
   "member_spread_now_deg": {
    "lat": 18.7,
    "lon": 21.0
   },
   "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": 32.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-05 17:45:00",
    "lat": 30.26732,
    "lon": 18.729,
    "alt_m": 9207.7
   },
   "member_spread_deg": {
    "lat": 26.01,
    "lon": 121.46
   },
   "member_spread_now_deg": {
    "lat": 9.82,
    "lon": 18.58
   },
   "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": 103.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-05 17:30:00",
    "lat": 52.07495,
    "lon": -123.1003,
    "alt_m": 8718.0
   },
   "member_spread_deg": {
    "lat": 32.67,
    "lon": 321.47
   },
   "member_spread_now_deg": {
    "lat": 26.47,
    "lon": 31.53
   },
   "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": 15.73,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-05 17:30:00",
    "lat": 48.22875,
    "lon": -106.65907,
    "alt_m": 12473.0
   },
   "member_spread_deg": {
    "lat": 20.73,
    "lon": 341.83
   },
   "member_spread_now_deg": {
    "lat": 3.37,
    "lon": 6.63
   },
   "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": 15.88,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-05 17:30:00",
    "lat": 49.57752,
    "lon": -105.37318,
    "alt_m": 12366.2
   },
   "member_spread_deg": {
    "lat": 17.82,
    "lon": 340.79
   },
   "member_spread_now_deg": {
    "lat": 3.39,
    "lon": 6.77
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 18:33:00",
   "seed_lat": 48.875,
   "seed_lon": -19.70833,
   "seed_alt_m": 12550.0,
   "seed_age_h": 4.78,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 18:00:00",
    "lat": 77.26602,
    "lon": -119.39437,
    "alt_m": 12008.9
   },
   "member_spread_deg": {
    "lat": 21.79,
    "lon": 305.69
   },
   "member_spread_now_deg": {
    "lat": 0.43,
    "lon": 1.33
   },
   "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": 131.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 17:45:00",
    "lat": 83.88938,
    "lon": 15.25459,
    "alt_m": 14810.4
   },
   "member_spread_deg": {
    "lat": 30.83,
    "lon": 271.15
   },
   "member_spread_now_deg": {
    "lat": 5.37,
    "lon": 300.78
   },
   "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": 8.87,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 17:30:00",
    "lat": 54.23692,
    "lon": -114.01529,
    "alt_m": 13117.2
   },
   "member_spread_deg": {
    "lat": 32.58,
    "lon": 59.73
   },
   "member_spread_now_deg": {
    "lat": 1.77,
    "lon": 32.02
   },
   "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": 155.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 17:45:00",
    "lat": 59.14618,
    "lon": 160.04077,
    "alt_m": 13671.6
   },
   "member_spread_deg": {
    "lat": 36.9,
    "lon": 351.92
   },
   "member_spread_now_deg": {
    "lat": 12.56,
    "lon": 288.4
   },
   "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": 28.24,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 17:30:00",
    "lat": 51.64221,
    "lon": 128.32864,
    "alt_m": 12986.4
   },
   "member_spread_deg": {
    "lat": 25.07,
    "lon": 147.47
   },
   "member_spread_now_deg": {
    "lat": 11.61,
    "lon": 12.47
   },
   "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": 64.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 17:30:00",
    "lat": 35.85262,
    "lon": 139.13926,
    "alt_m": 13152.5
   },
   "member_spread_deg": {
    "lat": 60.87,
    "lon": 281.15
   },
   "member_spread_now_deg": {
    "lat": 23.03,
    "lon": 51.66
   },
   "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": 241.38,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 17:30:00",
    "lat": -31.12169,
    "lon": 120.96894,
    "alt_m": 14402.8
   },
   "member_spread_deg": {
    "lat": 45.36,
    "lon": 295.12
   },
   "member_spread_now_deg": {
    "lat": 21.38,
    "lon": 271.84
   },
   "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 22:57:03",
   "seed_lat": 71.58333,
   "seed_lon": 169.41667,
   "seed_alt_m": 13140.0,
   "seed_age_h": 0.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 23:00:00",
    "lat": 73.45743,
    "lon": -88.43184,
    "alt_m": 13293.4
   },
   "member_spread_deg": {
    "lat": 25.55,
    "lon": 262.11
   },
   "member_spread_now_deg": {
    "lat": 0.08,
    "lon": 0.28
   },
   "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": 38.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 17:45:00",
    "lat": 53.0167,
    "lon": 74.62025,
    "alt_m": 12780.8
   },
   "member_spread_deg": {
    "lat": 14.8,
    "lon": 327.59
   },
   "member_spread_now_deg": {
    "lat": 10.5,
    "lon": 7.69
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   "display_as": "track",
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  },
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  },
  {
   "callsign": "ZS6SRC-84",
   "flight_id": "ZS6SRC-84_2026-07-12",
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   "seed_time": "2026-07-27 15:20:00",
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   "float_reliable": true,
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   "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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   "float_reliable": true,
   "dead_reckoned": true,
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   "nominal_end": {
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   "member_spread_now_deg": {
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   "display_as": "region",
   "display_reason": "member_spread"
  }
 ]
}