{
 "generated_utc": "2026-09-27T05:27:44Z",
 "gfs_cycle_utc": "2026-09-27T00:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 493.0,
  "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_20260927_00Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260927_00Z.geojson.gz"
 },
 "counts": {
  "flights": 47,
  "members": 9,
  "rows": 208665
 },
 "flights": [
  {
   "callsign": "AE4ZZ-22",
   "flight_id": "AE4ZZ-22_2026-09-19",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 15:38:41",
   "seed_lat": 44.43746,
   "seed_lon": -30.29163,
   "seed_alt_m": 13470.0,
   "seed_age_h": 85.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 23:45:00",
    "lat": 31.39737,
    "lon": -159.60306,
    "alt_m": 13218.7
   },
   "member_spread_deg": {
    "lat": 35.99,
    "lon": 327.18
   },
   "member_spread_now_deg": {
    "lat": 56.3,
    "lon": 71.8
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "AE4ZZ-23",
   "flight_id": "AE4ZZ-23_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 14:10:00",
   "seed_lat": 36.60414,
   "seed_lon": 9.66669,
   "seed_alt_m": 13520.0,
   "seed_age_h": 15.17,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 23:45:00",
    "lat": 47.82213,
    "lon": 176.55628,
    "alt_m": 12677.0
   },
   "member_spread_deg": {
    "lat": 24.56,
    "lon": 346.6
   },
   "member_spread_now_deg": {
    "lat": 2.24,
    "lon": 1.09
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 21:33:40",
   "seed_lat": -72.83333,
   "seed_lon": -85.49999,
   "seed_alt_m": 12120.0,
   "seed_age_h": 7.77,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-03 23:30:00",
    "lat": -57.73874,
    "lon": -137.39763,
    "alt_m": 12112.7
   },
   "member_spread_deg": {
    "lat": 14.71,
    "lon": 271.94
   },
   "member_spread_now_deg": {
    "lat": 3.63,
    "lon": 6.0
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 03:27:48",
   "seed_lat": 44.75,
   "seed_lon": -149.58333,
   "seed_alt_m": 13510.0,
   "seed_age_h": 1.87,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 03:00:00",
    "lat": 14.00467,
    "lon": -74.26655,
    "alt_m": 13908.5
   },
   "member_spread_deg": {
    "lat": 57.78,
    "lon": 68.32
   },
   "member_spread_now_deg": {
    "lat": 0.28,
    "lon": 0.6
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 19:57:18",
   "seed_lat": 48.89583,
   "seed_lon": -47.5,
   "seed_alt_m": 12990.0,
   "seed_age_h": 9.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 23:30:00",
    "lat": 41.07839,
    "lon": 115.6155,
    "alt_m": 12929.8
   },
   "member_spread_deg": {
    "lat": 8.2,
    "lon": 80.49
   },
   "member_spread_now_deg": {
    "lat": 6.39,
    "lon": 8.59
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 02:46:19",
   "seed_lat": 50.35417,
   "seed_lon": -169.70833,
   "seed_alt_m": 13430.0,
   "seed_age_h": 2.56,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 02:15:00",
    "lat": 61.51865,
    "lon": 25.25712,
    "alt_m": 13782.3
   },
   "member_spread_deg": {
    "lat": 26.4,
    "lon": 128.23
   },
   "member_spread_now_deg": {
    "lat": 0.2,
    "lon": 2.67
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BZ-7",
   "flight_id": "BZ-7_2026-08-06",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 07:29:00",
   "seed_lat": 31.91667,
   "seed_lon": 0.95833,
   "seed_alt_m": 11580.0,
   "seed_age_h": 165.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-03 23:30:00",
    "lat": 44.4207,
    "lon": -58.20036,
    "alt_m": 11271.3
   },
   "member_spread_deg": {
    "lat": 32.38,
    "lon": 168.87
   },
   "member_spread_now_deg": {
    "lat": 21.9,
    "lon": 347.97
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 20:33:46",
   "seed_lat": 48.70833,
   "seed_lon": -73.75,
   "seed_alt_m": 12420.0,
   "seed_age_h": 8.77,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 23:30:00",
    "lat": 36.02623,
    "lon": 73.94415,
    "alt_m": 12493.8
   },
   "member_spread_deg": {
    "lat": 10.44,
    "lon": 123.18
   },
   "member_spread_now_deg": {
    "lat": 2.13,
    "lon": 10.79
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 20:06:02",
   "seed_lat": 48.62734,
   "seed_lon": -73.94479,
   "seed_alt_m": 12430.0,
   "seed_age_h": 9.23,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 23:30:00",
    "lat": 36.05722,
    "lon": 74.06904,
    "alt_m": 12506.3
   },
   "member_spread_deg": {
    "lat": 16.02,
    "lon": 61.76
   },
   "member_spread_now_deg": {
    "lat": 2.26,
    "lon": 10.77
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-30",
   "flight_id": "DG2GG-30_2026-08-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 11:56:00",
   "seed_lat": 72.0,
   "seed_lon": 49.83333,
   "seed_alt_m": 12800.0,
   "seed_age_h": 17.4,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 23:30:00",
    "lat": 55.1031,
    "lon": -143.8734,
    "alt_m": 12560.5
   },
   "member_spread_deg": {
    "lat": 16.97,
    "lon": 47.07
   },
   "member_spread_now_deg": {
    "lat": 5.35,
    "lon": 6.48
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-31",
   "flight_id": "DG2GG-31_2026-08-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 23:02:00",
   "seed_lat": 34.22917,
   "seed_lon": -119.70833,
   "seed_alt_m": 13390.0,
   "seed_age_h": 6.3,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 23:30:00",
    "lat": 35.81201,
    "lon": -0.58428,
    "alt_m": 13451.9
   },
   "member_spread_deg": {
    "lat": 20.4,
    "lon": 108.56
   },
   "member_spread_now_deg": {
    "lat": 1.78,
    "lon": 3.58
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-32",
   "flight_id": "DG2GG-32_2026-09-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 23:16:00",
   "seed_lat": 58.95833,
   "seed_lon": -106.375,
   "seed_alt_m": 12930.0,
   "seed_age_h": 6.07,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 23:45:00",
    "lat": 54.14171,
    "lon": 42.80703,
    "alt_m": 13511.4
   },
   "member_spread_deg": {
    "lat": 28.12,
    "lon": 51.95
   },
   "member_spread_now_deg": {
    "lat": 1.39,
    "lon": 4.68
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 00:30:00",
   "seed_lat": 41.3125,
   "seed_lon": -155.33333,
   "seed_alt_m": 13400.0,
   "seed_age_h": 4.83,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 00:00:00",
    "lat": 15.13003,
    "lon": -70.056,
    "alt_m": 13619.9
   },
   "member_spread_deg": {
    "lat": 44.37,
    "lon": 76.79
   },
   "member_spread_now_deg": {
    "lat": 0.61,
    "lon": 1.66
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DO3GU-44",
   "flight_id": "DO3GU-44_2026-07-29",
   "payload_type": "WSPR",
   "seed_time": "2026-09-18 13:18:43",
   "seed_lat": 35.89583,
   "seed_lon": -76.25,
   "seed_alt_m": 15219.0,
   "seed_age_h": 208.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 23:45:00",
    "lat": 9.04947,
    "lon": -37.98329,
    "alt_m": 15345.1
   },
   "member_spread_deg": {
    "lat": 41.05,
    "lon": 322.01
   },
   "member_spread_now_deg": {
    "lat": 51.76,
    "lon": 90.97
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DO3GU-48",
   "flight_id": "DO3GU-48_2026-09-08",
   "payload_type": "WSPR",
   "seed_time": "2026-09-18 07:36:22",
   "seed_lat": 68.0,
   "seed_lon": 83.29167,
   "seed_alt_m": 14417.0,
   "seed_age_h": 213.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 23:30:00",
    "lat": 43.61441,
    "lon": 72.65382,
    "alt_m": 14502.8
   },
   "member_spread_deg": {
    "lat": 33.33,
    "lon": 96.34
   },
   "member_spread_now_deg": {
    "lat": 10.83,
    "lon": 45.14
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "DO3GU-49",
   "flight_id": "DO3GU-49_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-19 12:40:28",
   "seed_lat": 39.83333,
   "seed_lon": 60.66667,
   "seed_alt_m": 13990.0,
   "seed_age_h": 184.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-03 23:45:00",
    "lat": 1.25366,
    "lon": -74.3095,
    "alt_m": 14474.8
   },
   "member_spread_deg": {
    "lat": 63.05,
    "lon": 273.76
   },
   "member_spread_now_deg": {
    "lat": 43.34,
    "lon": 342.23
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DO3GU-8",
   "flight_id": "DO3GU-8_2026-08-12",
   "payload_type": "APRS",
   "seed_time": "2026-09-26 19:41:35",
   "seed_lat": 47.76366,
   "seed_lon": -113.55491,
   "seed_alt_m": 14135.0,
   "seed_age_h": 9.64,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 23:45:00",
    "lat": 44.28699,
    "lon": 66.23459,
    "alt_m": 14086.7
   },
   "member_spread_deg": {
    "lat": 41.97,
    "lon": 44.88
   },
   "member_spread_now_deg": {
    "lat": 3.51,
    "lon": 5.26
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 15:43:00",
   "seed_lat": 46.35417,
   "seed_lon": -3.83333,
   "seed_alt_m": 13430.0,
   "seed_age_h": 13.62,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 23:45:00",
    "lat": 38.48312,
    "lon": 123.45263,
    "alt_m": 13107.5
   },
   "member_spread_deg": {
    "lat": 8.9,
    "lon": 111.24
   },
   "member_spread_now_deg": {
    "lat": 1.88,
    "lon": 2.79
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KC3LBR-485",
   "flight_id": "KC3LBR-485_2026-03-19",
   "payload_type": "WSPR",
   "seed_time": "2026-09-15 23:15:47",
   "seed_lat": 26.64583,
   "seed_lon": -149.20833,
   "seed_alt_m": 13760.0,
   "seed_age_h": 270.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-03 23:45:00",
    "lat": 32.13502,
    "lon": 123.30569,
    "alt_m": 13613.7
   },
   "member_spread_deg": {
    "lat": 37.37,
    "lon": 256.32
   },
   "member_spread_now_deg": {
    "lat": 47.58,
    "lon": 143.37
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC5TRB-1",
   "flight_id": "KC5TRB-1_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 04:55:43",
   "seed_lat": 47.10411,
   "seed_lon": 148.79169,
   "seed_alt_m": 13000.0,
   "seed_age_h": 168.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 23:30:00",
    "lat": 48.10876,
    "lon": 53.70836,
    "alt_m": 12974.1
   },
   "member_spread_deg": {
    "lat": 44.13,
    "lon": 237.89
   },
   "member_spread_now_deg": {
    "lat": 34.87,
    "lon": 94.52
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KE8RES-8",
   "flight_id": "KE8RES-8_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-09-13 13:01:00",
   "seed_lat": 42.0625,
   "seed_lon": 28.04167,
   "seed_alt_m": 12700.0,
   "seed_age_h": 328.32,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 23:30:00",
    "lat": 48.75039,
    "lon": 171.63115,
    "alt_m": 12144.5
   },
   "member_spread_deg": {
    "lat": 21.8,
    "lon": 317.98
   },
   "member_spread_now_deg": {
    "lat": 51.98,
    "lon": 191.99
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 17:45:45",
   "seed_lat": 68.62495,
   "seed_lon": -51.87498,
   "seed_alt_m": 12840.0,
   "seed_age_h": 11.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 23:45:00",
    "lat": 82.01483,
    "lon": 52.80635,
    "alt_m": 12856.8
   },
   "member_spread_deg": {
    "lat": 47.61,
    "lon": 61.58
   },
   "member_spread_now_deg": {
    "lat": 2.04,
    "lon": 3.01
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KJ4AWK-1",
   "flight_id": "KJ4AWK-1_2026-08-22",
   "payload_type": "APRS",
   "seed_time": "2026-09-26 23:40:52",
   "seed_lat": 59.10342,
   "seed_lon": -116.23583,
   "seed_alt_m": 12175.0,
   "seed_age_h": 5.65,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-03 23:45:00",
    "lat": 66.96597,
    "lon": 10.83199,
    "alt_m": 12390.0
   },
   "member_spread_deg": {
    "lat": 29.45,
    "lon": 94.2
   },
   "member_spread_now_deg": {
    "lat": 1.36,
    "lon": 2.58
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
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  },
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  },
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  },
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  },
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  },
  {
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  {
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   "payload_type": "WSPR",
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 ]
}