{
 "generated_utc": "2026-07-30T23:28:07Z",
 "gfs_cycle_utc": "2026-07-30T18:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 498.5,
  "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_18Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260730_18Z.geojson.gz"
 },
 "counts": {
  "flights": 48,
  "members": 9,
  "rows": 253386
 },
 "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": 335.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-06 17:45:00",
    "lat": 37.43417,
    "lon": 86.0266,
    "alt_m": 12067.4
   },
   "member_spread_deg": {
    "lat": 70.95,
    "lon": 203.63
   },
   "member_spread_now_deg": {
    "lat": 72.32,
    "lon": 312.99
   },
   "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": 285.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 17:45:00",
    "lat": 27.77731,
    "lon": -103.53408,
    "alt_m": 14203.9
   },
   "member_spread_deg": {
    "lat": 61.21,
    "lon": 125.32
   },
   "member_spread_now_deg": {
    "lat": 30.95,
    "lon": 53.42
   },
   "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 22:53:40",
   "seed_lat": -61.5,
   "seed_lon": 171.04168,
   "seed_alt_m": 12060.0,
   "seed_age_h": 0.44,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-06 23:00:00",
    "lat": -55.29872,
    "lon": 59.64649,
    "alt_m": 12568.1
   },
   "member_spread_deg": {
    "lat": 5.12,
    "lon": 36.02
   },
   "member_spread_now_deg": {
    "lat": 0.12,
    "lon": 0.45
   },
   "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": 149.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 17:45:00",
    "lat": 65.7619,
    "lon": -141.25942,
    "alt_m": 13110.6
   },
   "member_spread_deg": {
    "lat": 56.19,
    "lon": 93.74
   },
   "member_spread_now_deg": {
    "lat": 16.97,
    "lon": 78.3
   },
   "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": 34.5,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 17:45:00",
    "lat": 46.88076,
    "lon": -177.22784,
    "alt_m": 13108.3
   },
   "member_spread_deg": {
    "lat": 38.67,
    "lon": 328.92
   },
   "member_spread_now_deg": {
    "lat": 3.62,
    "lon": 11.16
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-07-30 21:05:48",
   "seed_lat": 47.625,
   "seed_lon": -55.20833,
   "seed_alt_m": 14230.0,
   "seed_age_h": 2.24,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 20:30:00",
    "lat": 43.83402,
    "lon": 1.21742,
    "alt_m": 14385.8
   },
   "member_spread_deg": {
    "lat": 17.45,
    "lon": 65.03
   },
   "member_spread_now_deg": {
    "lat": 0.2,
    "lon": 2.53
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-07-30 22:26:30",
   "seed_lat": 34.41667,
   "seed_lon": -156.29167,
   "seed_alt_m": 13065.0,
   "seed_age_h": 0.89,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 22:00:00",
    "lat": 46.67598,
    "lon": -121.33844,
    "alt_m": 12902.3
   },
   "member_spread_deg": {
    "lat": 23.07,
    "lon": 119.53
   },
   "member_spread_now_deg": {
    "lat": 0.2,
    "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": 135.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 17:45:00",
    "lat": 62.97696,
    "lon": -16.92552,
    "alt_m": 12998.8
   },
   "member_spread_deg": {
    "lat": 30.14,
    "lon": 239.36
   },
   "member_spread_now_deg": {
    "lat": 27.18,
    "lon": 86.49
   },
   "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 22:23:00",
   "seed_lat": 51.41667,
   "seed_lon": 166.375,
   "seed_alt_m": 13480.0,
   "seed_age_h": 0.95,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 22:00:00",
    "lat": 45.90512,
    "lon": -135.08343,
    "alt_m": 13751.7
   },
   "member_spread_deg": {
    "lat": 41.82,
    "lon": 336.55
   },
   "member_spread_now_deg": {
    "lat": 0.07,
    "lon": 0.98
   },
   "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": 56.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-06 17:45:00",
    "lat": 35.85804,
    "lon": 22.67569,
    "alt_m": 9128.8
   },
   "member_spread_deg": {
    "lat": 51.13,
    "lon": 194.68
   },
   "member_spread_now_deg": {
    "lat": 13.0,
    "lon": 25.71
   },
   "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": 127.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-06 17:30:00",
    "lat": 61.92819,
    "lon": -139.08279,
    "alt_m": 8723.3
   },
   "member_spread_deg": {
    "lat": 35.01,
    "lon": 353.45
   },
   "member_spread_now_deg": {
    "lat": 24.38,
    "lon": 49.2
   },
   "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": 39.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-06 17:30:00",
    "lat": 69.42828,
    "lon": -110.10325,
    "alt_m": 12086.4
   },
   "member_spread_deg": {
    "lat": 29.15,
    "lon": 97.93
   },
   "member_spread_now_deg": {
    "lat": 3.55,
    "lon": 39.61
   },
   "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": 39.88,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-06 17:30:00",
    "lat": 69.8194,
    "lon": -110.64745,
    "alt_m": 12088.9
   },
   "member_spread_deg": {
    "lat": 44.56,
    "lon": 97.76
   },
   "member_spread_now_deg": {
    "lat": 3.37,
    "lon": 40.11
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-07-30 18:03:00",
   "seed_lat": 60.89583,
   "seed_lon": 10.375,
   "seed_alt_m": 12280.0,
   "seed_age_h": 5.28,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-06 17:30:00",
    "lat": 76.19081,
    "lon": 66.39244,
    "alt_m": 12155.9
   },
   "member_spread_deg": {
    "lat": 33.69,
    "lon": 282.13
   },
   "member_spread_now_deg": {
    "lat": 1.82,
    "lon": 4.51
   },
   "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": 155.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 17:45:00",
    "lat": 60.66416,
    "lon": -109.8476,
    "alt_m": 15150.2
   },
   "member_spread_deg": {
    "lat": 26.06,
    "lon": 296.63
   },
   "member_spread_now_deg": {
    "lat": 11.09,
    "lon": 349.47
   },
   "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 05:43:00",
   "seed_lat": 76.0625,
   "seed_lon": 95.45833,
   "seed_alt_m": 12560.0,
   "seed_age_h": 17.62,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 17:45:00",
    "lat": 47.89456,
    "lon": -92.25293,
    "alt_m": 13009.1
   },
   "member_spread_deg": {
    "lat": 46.74,
    "lon": 80.26
   },
   "member_spread_now_deg": {
    "lat": 9.53,
    "lon": 14.8
   },
   "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": 179.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 17:45:00",
    "lat": 39.03596,
    "lon": -176.82152,
    "alt_m": 14364.7
   },
   "member_spread_deg": {
    "lat": 63.87,
    "lon": 337.71
   },
   "member_spread_now_deg": {
    "lat": 26.71,
    "lon": 318.38
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "K5NOT-11",
   "flight_id": "K5NOT-11_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-07-30 18:13:07",
   "seed_lat": 27.22911,
   "seed_lon": -21.79166,
   "seed_alt_m": 13480.0,
   "seed_age_h": 5.12,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 17:45:00",
    "lat": 30.45813,
    "lon": 107.04199,
    "alt_m": 13256.9
   },
   "member_spread_deg": {
    "lat": 18.99,
    "lon": 116.99
   },
   "member_spread_now_deg": {
    "lat": 1.17,
    "lon": 1.46
   },
   "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": 88.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 17:30:00",
    "lat": 36.87346,
    "lon": 153.92668,
    "alt_m": 13147.5
   },
   "member_spread_deg": {
    "lat": 63.59,
    "lon": 311.4
   },
   "member_spread_now_deg": {
    "lat": 27.67,
    "lon": 345.22
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "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": 265.38,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 17:30:00",
    "lat": -28.67231,
    "lon": 152.58306,
    "alt_m": 14224.4
   },
   "member_spread_deg": {
    "lat": 50.94,
    "lon": 298.49
   },
   "member_spread_now_deg": {
    "lat": 22.87,
    "lon": 283.64
   },
   "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 22:57:03",
   "seed_lat": 72.64583,
   "seed_lon": -157.79167,
   "seed_alt_m": 13240.0,
   "seed_age_h": 0.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 23:00:00",
    "lat": 59.43179,
    "lon": -63.09746,
    "alt_m": 13369.7
   },
   "member_spread_deg": {
    "lat": 30.8,
    "lon": 116.64
   },
   "member_spread_now_deg": {
    "lat": 0.15,
    "lon": 0.59
   },
   "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": 62.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 17:45:00",
    "lat": 64.52686,
    "lon": 91.57107,
    "alt_m": 12926.8
   },
   "member_spread_deg": {
    "lat": 11.7,
    "lon": 304.72
   },
   "member_spread_now_deg": {
    "lat": 22.25,
    "lon": 8.42
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KC5TRB-1",
   "flight_id": "KC5TRB-1_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-07-30 15:50:43",
   "seed_lat": 57.08328,
   "seed_lon": 7.00003,
   "seed_alt_m": 12720.0,
   "seed_age_h": 7.49,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 17:45:00",
    "lat": 75.49878,
    "lon": 145.6705,
    "alt_m": 12555.3
   },
   "member_spread_deg": {
    "lat": 24.57,
    "lon": 89.02
   },
   "member_spread_now_deg": {
    "lat": 2.0,
    "lon": 5.82
   },
   "display_as": "track",
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    "lon": 163.62
   },
   "member_spread_now_deg": {
    "lat": 11.72,
    "lon": 317.0
   },
   "display_as": "region",
   "display_reason": "member_spread"
  }
 ]
}