{
 "generated_utc": "2026-09-27T17:27:32Z",
 "gfs_cycle_utc": "2026-09-27T12:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 471.5,
  "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_20260927_12Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260927_12Z.geojson.gz"
 },
 "counts": {
  "flights": 45,
  "members": 9,
  "rows": 189738
 },
 "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": 97.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 11:45:00",
    "lat": 32.23784,
    "lon": -152.30772,
    "alt_m": 13252.3
   },
   "member_spread_deg": {
    "lat": 43.98,
    "lon": 298.99
   },
   "member_spread_now_deg": {
    "lat": 52.3,
    "lon": 80.63
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "AE4ZZ-23",
   "flight_id": "AE4ZZ-23_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 14:20:00",
   "seed_lat": 31.18747,
   "seed_lon": 12.16668,
   "seed_alt_m": 13490.0,
   "seed_age_h": 3.0,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 13:45:00",
    "lat": 59.78168,
    "lon": -164.53165,
    "alt_m": 12610.4
   },
   "member_spread_deg": {
    "lat": 20.01,
    "lon": 337.43
   },
   "member_spread_now_deg": {
    "lat": 0.34,
    "lon": 0.18
   },
   "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": 19.77,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-04 11:30:00",
    "lat": -79.99678,
    "lon": -157.06794,
    "alt_m": 12079.2
   },
   "member_spread_deg": {
    "lat": 14.41,
    "lon": 323.09
   },
   "member_spread_now_deg": {
    "lat": 7.02,
    "lon": 11.23
   },
   "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": 13.87,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 11:30:00",
    "lat": 24.99797,
    "lon": -82.21989,
    "alt_m": 13949.4
   },
   "member_spread_deg": {
    "lat": 39.39,
    "lon": 68.83
   },
   "member_spread_now_deg": {
    "lat": 3.25,
    "lon": 4.23
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 16:25:18",
   "seed_lat": 27.39583,
   "seed_lon": -30.75,
   "seed_alt_m": 13670.0,
   "seed_age_h": 0.91,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 16:00:00",
    "lat": 18.24219,
    "lon": 20.02575,
    "alt_m": 13698.9
   },
   "member_spread_deg": {
    "lat": 14.31,
    "lon": 31.63
   },
   "member_spread_now_deg": {
    "lat": 0.06,
    "lon": 0.52
   },
   "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": 14.56,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 11:45:00",
    "lat": 57.09751,
    "lon": 24.39374,
    "alt_m": 13834.2
   },
   "member_spread_deg": {
    "lat": 34.82,
    "lon": 149.07
   },
   "member_spread_now_deg": {
    "lat": 1.05,
    "lon": 12.13
   },
   "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": 177.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-04 11:30:00",
    "lat": 45.92125,
    "lon": -139.64913,
    "alt_m": 11553.1
   },
   "member_spread_deg": {
    "lat": 35.6,
    "lon": 278.44
   },
   "member_spread_now_deg": {
    "lat": 24.65,
    "lon": 314.5
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 16:54:01",
   "seed_lat": 48.29167,
   "seed_lon": -49.20833,
   "seed_alt_m": 12010.0,
   "seed_age_h": 0.43,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-04 17:00:00",
    "lat": 39.83363,
    "lon": 138.58152,
    "alt_m": 12108.2
   },
   "member_spread_deg": {
    "lat": 11.5,
    "lon": 73.35
   },
   "member_spread_now_deg": {
    "lat": 0.03,
    "lon": 0.82
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 16:55:32",
   "seed_lat": 48.29349,
   "seed_lon": -49.20851,
   "seed_alt_m": 12010.0,
   "seed_age_h": 0.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-04 17:00:00",
    "lat": 39.82663,
    "lon": 138.58804,
    "alt_m": 12109.6
   },
   "member_spread_deg": {
    "lat": 11.5,
    "lon": 73.27
   },
   "member_spread_now_deg": {
    "lat": 0.03,
    "lon": 0.82
   },
   "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": 29.4,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 11:30:00",
    "lat": 37.85615,
    "lon": -154.69935,
    "alt_m": 12840.9
   },
   "member_spread_deg": {
    "lat": 28.69,
    "lon": 165.49
   },
   "member_spread_now_deg": {
    "lat": 9.35,
    "lon": 5.9
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-31",
   "flight_id": "DG2GG-31_2026-08-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 15:57:00",
   "seed_lat": 31.27083,
   "seed_lon": -94.375,
   "seed_alt_m": 13570.0,
   "seed_age_h": 1.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 15:30:00",
    "lat": 19.34656,
    "lon": -26.10105,
    "alt_m": 13659.1
   },
   "member_spread_deg": {
    "lat": 16.09,
    "lon": 60.79
   },
   "member_spread_now_deg": {
    "lat": 0.76,
    "lon": 0.51
   },
   "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": 18.07,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 11:45:00",
    "lat": 69.65732,
    "lon": 75.82142,
    "alt_m": 13000.6
   },
   "member_spread_deg": {
    "lat": 30.59,
    "lon": 86.05
   },
   "member_spread_now_deg": {
    "lat": 4.93,
    "lon": 23.98
   },
   "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": 16.83,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 11:30:00",
    "lat": 22.19759,
    "lon": -66.67007,
    "alt_m": 13700.7
   },
   "member_spread_deg": {
    "lat": 49.01,
    "lon": 91.73
   },
   "member_spread_now_deg": {
    "lat": 2.48,
    "lon": 3.99
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-36",
   "flight_id": "DG2GG-36_2026-09-26",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 12:55:00",
   "seed_lat": 42.875,
   "seed_lon": 16.625,
   "seed_alt_m": 13370.0,
   "seed_age_h": 4.42,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 12:30:00",
    "lat": 46.59777,
    "lon": -167.8056,
    "alt_m": 12714.4
   },
   "member_spread_deg": {
    "lat": 8.88,
    "lon": 334.65
   },
   "member_spread_now_deg": {
    "lat": 0.63,
    "lon": 2.28
   },
   "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": 220.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 11:45:00",
    "lat": 11.31284,
    "lon": -36.56033,
    "alt_m": 15362.1
   },
   "member_spread_deg": {
    "lat": 51.18,
    "lon": 279.93
   },
   "member_spread_now_deg": {
    "lat": 50.86,
    "lon": 94.08
   },
   "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": 225.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 11:30:00",
    "lat": 51.55499,
    "lon": 98.33987,
    "alt_m": 14510.9
   },
   "member_spread_deg": {
    "lat": 34.02,
    "lon": 122.95
   },
   "member_spread_now_deg": {
    "lat": 12.01,
    "lon": 52.53
   },
   "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": 196.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-04 11:45:00",
    "lat": 10.23392,
    "lon": -71.9636,
    "alt_m": 14442.6
   },
   "member_spread_deg": {
    "lat": 77.42,
    "lon": 192.0
   },
   "member_spread_now_deg": {
    "lat": 45.24,
    "lon": 338.81
   },
   "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": 21.64,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 11:45:00",
    "lat": 51.8902,
    "lon": 45.04945,
    "alt_m": 14139.1
   },
   "member_spread_deg": {
    "lat": 34.05,
    "lon": 64.56
   },
   "member_spread_now_deg": {
    "lat": 7.92,
    "lon": 10.61
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 14:28:00",
   "seed_lat": 47.77083,
   "seed_lon": 8.54167,
   "seed_alt_m": 13450.0,
   "seed_age_h": 2.87,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 14:00:00",
    "lat": 40.41863,
    "lon": 131.30912,
    "alt_m": 12795.9
   },
   "member_spread_deg": {
    "lat": 7.89,
    "lon": 320.04
   },
   "member_spread_now_deg": {
    "lat": 0.66,
    "lon": 0.45
   },
   "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": 282.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-04 11:45:00",
    "lat": 40.49717,
    "lon": 173.94612,
    "alt_m": 13616.2
   },
   "member_spread_deg": {
    "lat": 41.67,
    "lon": 307.05
   },
   "member_spread_now_deg": {
    "lat": 33.78,
    "lon": 146.6
   },
   "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": 180.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 11:30:00",
    "lat": 45.63263,
    "lon": 65.48048,
    "alt_m": 12646.9
   },
   "member_spread_deg": {
    "lat": 11.88,
    "lon": 202.44
   },
   "member_spread_now_deg": {
    "lat": 21.98,
    "lon": 106.75
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 16:45:45",
   "seed_lat": 63.37495,
   "seed_lon": -43.49998,
   "seed_alt_m": 12780.0,
   "seed_age_h": 0.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 16:15:00",
    "lat": 81.91427,
    "lon": 59.77409,
    "alt_m": 12706.9
   },
   "member_spread_deg": {
    "lat": 13.53,
    "lon": 90.11
   },
   "member_spread_now_deg": {
    "lat": 0.06,
    "lon": 0.17
   },
   "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": 17.65,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-04 11:45:00",
    "lat": 58.55809,
    "lon": 32.25393,
    "alt_m": 12832.5
   },
   "member_spread_deg": {
    "lat": 31.4,
    "lon": 116.41
   },
   "member_spread_now_deg": {
    "lat": 5.32,
    "lon": 5.62
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
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  },
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  {
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  {
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   "payload_type": "WSPR",
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 ]
}