{
 "generated_utc": "2026-08-03T17:27:42Z",
 "gfs_cycle_utc": "2026-08-03T12:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 488.5,
  "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_20260803_12Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260803_12Z.geojson.gz"
 },
 "counts": {
  "flights": 39,
  "members": 9,
  "rows": 194850
 },
 "flights": [
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 16:53:40",
   "seed_lat": -43.6875,
   "seed_lon": -90.54165,
   "seed_alt_m": 12360.0,
   "seed_age_h": 0.44,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-10 17:00:00",
    "lat": -42.4455,
    "lon": 175.82469,
    "alt_m": 12791.8
   },
   "member_spread_deg": {
    "lat": 31.36,
    "lon": 355.57
   },
   "member_spread_now_deg": {
    "lat": 0.04,
    "lon": 0.11
   },
   "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": 239.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 11:45:00",
    "lat": 40.56944,
    "lon": -46.52255,
    "alt_m": 13398.9
   },
   "member_spread_deg": {
    "lat": 31.1,
    "lon": 166.53
   },
   "member_spread_now_deg": {
    "lat": 30.18,
    "lon": 342.5
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 07:15:19",
   "seed_lat": 70.85417,
   "seed_lon": 140.58333,
   "seed_alt_m": 12340.0,
   "seed_age_h": 10.08,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-10 11:45:00",
    "lat": 66.53299,
    "lon": -5.60231,
    "alt_m": 12615.3
   },
   "member_spread_deg": {
    "lat": 25.37,
    "lon": 106.98
   },
   "member_spread_now_deg": {
    "lat": 3.65,
    "lon": 12.51
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 16:37:18",
   "seed_lat": 27.10417,
   "seed_lon": -35.45833,
   "seed_alt_m": 14500.0,
   "seed_age_h": 0.71,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 16:00:00",
    "lat": 41.38726,
    "lon": 111.67542,
    "alt_m": 14173.1
   },
   "member_spread_deg": {
    "lat": 15.75,
    "lon": 100.69
   },
   "member_spread_now_deg": {
    "lat": 0.1,
    "lon": 0.25
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 03:16:30",
   "seed_lat": 31.72917,
   "seed_lon": -165.79167,
   "seed_alt_m": 13075.0,
   "seed_age_h": 14.06,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 11:45:00",
    "lat": 45.62848,
    "lon": -86.0807,
    "alt_m": 12888.3
   },
   "member_spread_deg": {
    "lat": 16.94,
    "lon": 111.58
   },
   "member_spread_now_deg": {
    "lat": 1.76,
    "lon": 2.97
   },
   "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": 225.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 11:45:00",
    "lat": 62.17063,
    "lon": 39.28508,
    "alt_m": 12699.1
   },
   "member_spread_deg": {
    "lat": 18.59,
    "lon": 326.95
   },
   "member_spread_now_deg": {
    "lat": 26.63,
    "lon": 197.0
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DG2GG-27",
   "flight_id": "DG2GG-27_2026-07-04",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 01:50:30",
   "seed_lat": 20.375,
   "seed_lon": -154.25,
   "seed_alt_m": 13920.0,
   "seed_age_h": 15.49,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-10 11:45:00",
    "lat": 49.99644,
    "lon": -54.47108,
    "alt_m": 13588.9
   },
   "member_spread_deg": {
    "lat": 24.03,
    "lon": 113.81
   },
   "member_spread_now_deg": {
    "lat": 5.06,
    "lon": 5.32
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-29",
   "flight_id": "DG2GG-29_2026-07-28",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 06:37:00",
   "seed_lat": 43.10417,
   "seed_lon": 148.0,
   "seed_alt_m": 13210.0,
   "seed_age_h": 10.72,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 11:30:00",
    "lat": 38.18144,
    "lon": -108.0767,
    "alt_m": 13640.0
   },
   "member_spread_deg": {
    "lat": 66.03,
    "lon": 328.95
   },
   "member_spread_now_deg": {
    "lat": 1.12,
    "lon": 2.7
   },
   "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": 146.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-10 11:45:00",
    "lat": 38.44132,
    "lon": 55.35897,
    "alt_m": 9170.8
   },
   "member_spread_deg": {
    "lat": 30.97,
    "lon": 130.54
   },
   "member_spread_now_deg": {
    "lat": 47.75,
    "lon": 120.5
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "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": 217.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-10 11:30:00",
    "lat": 53.44169,
    "lon": 14.95658,
    "alt_m": 8665.5
   },
   "member_spread_deg": {
    "lat": 38.32,
    "lon": 354.67
   },
   "member_spread_now_deg": {
    "lat": 27.37,
    "lon": 298.18
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "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": 129.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-10 11:30:00",
    "lat": 49.37271,
    "lon": 37.81293,
    "alt_m": 12451.4
   },
   "member_spread_deg": {
    "lat": 15.52,
    "lon": 189.12
   },
   "member_spread_now_deg": {
    "lat": 19.5,
    "lon": 352.18
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "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": 129.88,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-10 11:30:00",
    "lat": 60.91048,
    "lon": -2.83915,
    "alt_m": 12447.2
   },
   "member_spread_deg": {
    "lat": 26.17,
    "lon": 131.12
   },
   "member_spread_now_deg": {
    "lat": 18.54,
    "lon": 353.19
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 10:18:00",
   "seed_lat": 61.10417,
   "seed_lon": 103.33333,
   "seed_alt_m": 12370.0,
   "seed_age_h": 7.03,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-10 11:45:00",
    "lat": 81.93285,
    "lon": 18.58571,
    "alt_m": 11353.8
   },
   "member_spread_deg": {
    "lat": 43.08,
    "lon": 354.54
   },
   "member_spread_now_deg": {
    "lat": 2.48,
    "lon": 1.24
   },
   "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": 245.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 11:45:00",
    "lat": 69.55524,
    "lon": -58.46212,
    "alt_m": 14945.7
   },
   "member_spread_deg": {
    "lat": 39.8,
    "lon": 314.64
   },
   "member_spread_now_deg": {
    "lat": 28.54,
    "lon": 321.0
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 05:43:00",
   "seed_lat": 51.47917,
   "seed_lon": 170.29167,
   "seed_alt_m": 12910.0,
   "seed_age_h": 11.62,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 11:45:00",
    "lat": 28.80625,
    "lon": -86.24619,
    "alt_m": 13550.1
   },
   "member_spread_deg": {
    "lat": 53.07,
    "lon": 225.06
   },
   "member_spread_now_deg": {
    "lat": 4.83,
    "lon": 10.02
   },
   "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": 269.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 11:45:00",
    "lat": 43.69854,
    "lon": -134.60263,
    "alt_m": 13819.2
   },
   "member_spread_deg": {
    "lat": 97.45,
    "lon": 345.27
   },
   "member_spread_now_deg": {
    "lat": 43.24,
    "lon": 334.44
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "K5NOT-11",
   "flight_id": "K5NOT-11_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 14:10:37",
   "seed_lat": 43.77078,
   "seed_lon": 25.08333,
   "seed_alt_m": 13060.0,
   "seed_age_h": 3.16,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 13:45:00",
    "lat": 32.4997,
    "lon": 172.29007,
    "alt_m": 13418.3
   },
   "member_spread_deg": {
    "lat": 48.87,
    "lon": 341.06
   },
   "member_spread_now_deg": {
    "lat": 0.55,
    "lon": 0.98
   },
   "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": 178.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 11:30:00",
    "lat": 53.25333,
    "lon": -164.69927,
    "alt_m": 13160.4
   },
   "member_spread_deg": {
    "lat": 77.95,
    "lon": 322.09
   },
   "member_spread_now_deg": {
    "lat": 54.0,
    "lon": 297.92
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC3LBR-449",
   "flight_id": "KC3LBR-449_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 16:57:03",
   "seed_lat": 58.83333,
   "seed_lon": -114.95833,
   "seed_alt_m": 13290.0,
   "seed_age_h": 0.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 17:00:00",
    "lat": 62.95562,
    "lon": 48.90096,
    "alt_m": 13168.7
   },
   "member_spread_deg": {
    "lat": 23.36,
    "lon": 131.17
   },
   "member_spread_now_deg": {
    "lat": 0.22,
    "lon": 0.09
   },
   "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": 152.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 11:45:00",
    "lat": 72.73453,
    "lon": 155.94005,
    "alt_m": 12828.6
   },
   "member_spread_deg": {
    "lat": 47.56,
    "lon": 352.91
   },
   "member_spread_now_deg": {
    "lat": 10.1,
    "lon": 354.83
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC5TRB-1",
   "flight_id": "KC5TRB-1_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-02 11:30:43",
   "seed_lat": 67.33328,
   "seed_lon": 65.58336,
   "seed_alt_m": 12840.0,
   "seed_age_h": 29.82,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 11:30:00",
    "lat": 63.79251,
    "lon": -50.57894,
    "alt_m": 12532.2
   },
   "member_spread_deg": {
    "lat": 27.5,
    "lon": 344.69
   },
   "member_spread_now_deg": {
    "lat": 6.57,
    "lon": 23.87
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KD7FXO-1",
   "flight_id": "KD7FXO-1_2026-08-02",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 04:20:00",
   "seed_lat": 38.91667,
   "seed_lon": -156.20833,
   "seed_alt_m": 13020.0,
   "seed_age_h": 13.0,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 11:45:00",
    "lat": 46.49241,
    "lon": -16.45365,
    "alt_m": 12795.8
   },
   "member_spread_deg": {
    "lat": 27.85,
    "lon": 127.9
   },
   "member_spread_now_deg": {
    "lat": 1.78,
    "lon": 0.82
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KE8RES-8",
   "flight_id": "KE8RES-8_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 16:33:30",
   "seed_lat": 53.10417,
   "seed_lon": -111.41667,
   "seed_alt_m": 12260.0,
   "seed_age_h": 0.78,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-10 16:00:00",
    "lat": 62.43533,
    "lon": -61.20296,
    "alt_m": 12228.8
   },
   "member_spread_deg": {
    "lat": 12.26,
    "lon": 38.92
   },
   "member_spread_now_deg": {
    "lat": 0.14,
    "lon": 0.25
   },
   "display_as": "track",
   "display_reason": "fresh"
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   "seed_time": "2026-08-03 16:41:00",
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  },
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  },
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  },
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   "seed_time": "2026-07-21 23:53:19",
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  },
  {
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  },
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   "seed_time": "2026-07-22 14:00:27",
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  },
  {
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  },
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   "display_as": "region",
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  },
  {
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  {
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  {
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  }
 ]
}