{
 "generated_utc": "2026-07-30T05:28:11Z",
 "gfs_cycle_utc": "2026-07-30T00:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 495.5,
  "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_20260730_00Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260730_00Z.geojson.gz"
 },
 "counts": {
  "flights": 50,
  "members": 9,
  "rows": 267093
 },
 "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": 317.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-05 23:45:00",
    "lat": 44.51246,
    "lon": 92.10986,
    "alt_m": 12041.5
   },
   "member_spread_deg": {
    "lat": 98.49,
    "lon": 248.71
   },
   "member_spread_now_deg": {
    "lat": 80.53,
    "lon": 311.72
   },
   "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": 333.33,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 23:30:00",
    "lat": 21.01694,
    "lon": -26.74633,
    "alt_m": 13039.5
   },
   "member_spread_deg": {
    "lat": 48.67,
    "lon": 317.8
   },
   "member_spread_now_deg": {
    "lat": 39.37,
    "lon": 213.59
   },
   "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": 267.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 23:45:00",
    "lat": 33.45483,
    "lon": -89.58191,
    "alt_m": 14225.6
   },
   "member_spread_deg": {
    "lat": 56.03,
    "lon": 121.2
   },
   "member_spread_now_deg": {
    "lat": 37.85,
    "lon": 51.03
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-07-30 04:28:40",
   "seed_lat": -63.27084,
   "seed_lon": 131.16668,
   "seed_alt_m": 12240.0,
   "seed_age_h": 0.86,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-06 04:00:00",
    "lat": -44.57382,
    "lon": 14.42674,
    "alt_m": 12478.3
   },
   "member_spread_deg": {
    "lat": 19.7,
    "lon": 116.93
   },
   "member_spread_now_deg": {
    "lat": 0.15,
    "lon": 0.38
   },
   "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": 131.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 23:45:00",
    "lat": 46.58605,
    "lon": -84.36655,
    "alt_m": 13416.1
   },
   "member_spread_deg": {
    "lat": 27.28,
    "lon": 346.25
   },
   "member_spread_now_deg": {
    "lat": 23.2,
    "lon": 81.32
   },
   "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": 16.5,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 23:45:00",
    "lat": 41.79545,
    "lon": 165.13728,
    "alt_m": 13056.9
   },
   "member_spread_deg": {
    "lat": 40.07,
    "lon": 296.27
   },
   "member_spread_now_deg": {
    "lat": 2.38,
    "lon": 2.21
   },
   "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": 7.46,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-05 23:30:00",
    "lat": 46.69456,
    "lon": -0.55891,
    "alt_m": 14140.2
   },
   "member_spread_deg": {
    "lat": 24.96,
    "lon": 142.5
   },
   "member_spread_now_deg": {
    "lat": 3.93,
    "lon": 4.36
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-07-30 02:49:00",
   "seed_lat": 29.64583,
   "seed_lon": -162.625,
   "seed_alt_m": 13040.0,
   "seed_age_h": 2.52,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 02:15:00",
    "lat": 51.303,
    "lon": -64.50109,
    "alt_m": 12938.7
   },
   "member_spread_deg": {
    "lat": 24.6,
    "lon": 323.9
   },
   "member_spread_now_deg": {
    "lat": 0.33,
    "lon": 0.99
   },
   "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": 117.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 23:45:00",
    "lat": 78.32276,
    "lon": -75.37457,
    "alt_m": 13001.0
   },
   "member_spread_deg": {
    "lat": 23.72,
    "lon": 222.94
   },
   "member_spread_now_deg": {
    "lat": 22.78,
    "lon": 328.48
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DG2GG-27",
   "flight_id": "DG2GG-27_2026-07-04",
   "payload_type": "WSPR",
   "seed_time": "2026-07-30 04:33:00",
   "seed_lat": 50.1875,
   "seed_lon": 150.75,
   "seed_alt_m": 13390.0,
   "seed_age_h": 0.78,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 04:00:00",
    "lat": 42.92425,
    "lon": -143.51668,
    "alt_m": 13705.7
   },
   "member_spread_deg": {
    "lat": 36.22,
    "lon": 331.3
   },
   "member_spread_now_deg": {
    "lat": 0.21,
    "lon": 0.39
   },
   "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": 38.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-05 23:45:00",
    "lat": 34.48725,
    "lon": 26.25387,
    "alt_m": 9109.6
   },
   "member_spread_deg": {
    "lat": 35.27,
    "lon": 150.1
   },
   "member_spread_now_deg": {
    "lat": 10.08,
    "lon": 22.06
   },
   "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": 109.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-05 23:30:00",
    "lat": 57.28425,
    "lon": -127.87977,
    "alt_m": 8595.3
   },
   "member_spread_deg": {
    "lat": 34.27,
    "lon": 351.04
   },
   "member_spread_now_deg": {
    "lat": 27.0,
    "lon": 37.51
   },
   "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": 21.73,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-05 23:30:00",
    "lat": 49.6757,
    "lon": -112.88112,
    "alt_m": 12318.3
   },
   "member_spread_deg": {
    "lat": 20.3,
    "lon": 344.39
   },
   "member_spread_now_deg": {
    "lat": 4.49,
    "lon": 7.4
   },
   "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": 21.88,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-05 23:30:00",
    "lat": 62.50116,
    "lon": -162.92558,
    "alt_m": 12052.7
   },
   "member_spread_deg": {
    "lat": 20.95,
    "lon": 345.29
   },
   "member_spread_now_deg": {
    "lat": 4.51,
    "lon": 8.23
   },
   "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": 10.78,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 23:30:00",
    "lat": 78.56765,
    "lon": -88.36756,
    "alt_m": 12475.8
   },
   "member_spread_deg": {
    "lat": 20.35,
    "lon": 220.79
   },
   "member_spread_now_deg": {
    "lat": 1.31,
    "lon": 3.7
   },
   "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": 137.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 23:45:00",
    "lat": 76.15661,
    "lon": -31.32049,
    "alt_m": 15052.2
   },
   "member_spread_deg": {
    "lat": 26.88,
    "lon": 279.18
   },
   "member_spread_now_deg": {
    "lat": 5.72,
    "lon": 301.98
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-30 04:03:00",
   "seed_lat": 76.39583,
   "seed_lon": 90.375,
   "seed_alt_m": 12540.0,
   "seed_age_h": 1.28,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 03:30:00",
    "lat": 68.67994,
    "lon": -126.39541,
    "alt_m": 12631.5
   },
   "member_spread_deg": {
    "lat": 39.01,
    "lon": 349.8
   },
   "member_spread_now_deg": {
    "lat": 0.47,
    "lon": 4.71
   },
   "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": 161.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 23:45:00",
    "lat": 43.86657,
    "lon": 169.85617,
    "alt_m": 13889.0
   },
   "member_spread_deg": {
    "lat": 46.12,
    "lon": 343.25
   },
   "member_spread_now_deg": {
    "lat": 11.13,
    "lon": 292.59
   },
   "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": 34.24,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 23:30:00",
    "lat": 47.16669,
    "lon": 122.70241,
    "alt_m": 13188.7
   },
   "member_spread_deg": {
    "lat": 23.87,
    "lon": 140.29
   },
   "member_spread_now_deg": {
    "lat": 9.75,
    "lon": 20.96
   },
   "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": 70.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 23:30:00",
    "lat": 31.50058,
    "lon": 129.88272,
    "alt_m": 13019.6
   },
   "member_spread_deg": {
    "lat": 69.41,
    "lon": 319.63
   },
   "member_spread_now_deg": {
    "lat": 24.85,
    "lon": 58.97
   },
   "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": 247.38,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 23:30:00",
    "lat": -30.84608,
    "lon": 132.42558,
    "alt_m": 14344.1
   },
   "member_spread_deg": {
    "lat": 46.08,
    "lon": 298.53
   },
   "member_spread_now_deg": {
    "lat": 22.56,
    "lon": 273.64
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC3LBR-449",
   "flight_id": "KC3LBR-449_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-07-30 04:57:03",
   "seed_lat": 72.25,
   "seed_lon": 177.91667,
   "seed_alt_m": 13170.0,
   "seed_age_h": 0.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 05:00:00",
    "lat": 68.59292,
    "lon": -113.32402,
    "alt_m": 13333.2
   },
   "member_spread_deg": {
    "lat": 39.22,
    "lon": 287.02
   },
   "member_spread_now_deg": {
    "lat": 0.05,
    "lon": 0.57
   },
   "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": 44.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-05 23:45:00",
    "lat": 56.64806,
    "lon": 88.81111,
    "alt_m": 12869.2
   },
   "member_spread_deg": {
    "lat": 11.76,
    "lon": 209.55
   },
   "member_spread_now_deg": {
    "lat": 14.77,
    "lon": 7.43
   },
   "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,
   "seed_alt_m": 13090.0,
   "seed_age_h": 62.0,
   "float_reliable": true,
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   "levels_spanned": 2,
   "nominal_end": {
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    "lon": -73.25259,
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   },
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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": 243.45,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
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    "lat": -39.56742,
    "lon": 51.09634,
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   "member_spread_deg": {
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   "member_spread_now_deg": {
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    "lon": 283.59
   },
   "display_as": "region",
   "display_reason": "member_spread"
  }
 ]
}