{
 "generated_utc": "2026-09-29T11:28:00Z",
 "gfs_cycle_utc": "2026-09-29T06:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 494.5,
  "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_20260929_06Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260929_06Z.geojson.gz"
 },
 "counts": {
  "flights": 48,
  "members": 9,
  "rows": 206847
 },
 "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": 139.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 05:45:00",
    "lat": 39.8499,
    "lon": -111.14232,
    "alt_m": 13308.1
   },
   "member_spread_deg": {
    "lat": 53.5,
    "lon": 88.15
   },
   "member_spread_now_deg": {
    "lat": 36.96,
    "lon": 89.26
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "AE4ZZ-23",
   "flight_id": "AE4ZZ-23_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 10:58:20",
   "seed_lat": 37.1458,
   "seed_lon": 30.375,
   "seed_alt_m": 13140.0,
   "seed_age_h": 0.36,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 11:00:00",
    "lat": 42.24932,
    "lon": -113.63063,
    "alt_m": 13187.0
   },
   "member_spread_deg": {
    "lat": 27.21,
    "lon": 49.47
   },
   "member_spread_now_deg": {
    "lat": 0.11,
    "lon": 0.14
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 10:33:40",
   "seed_lat": -67.5,
   "seed_lon": 73.62501,
   "seed_alt_m": 12180.0,
   "seed_age_h": 0.77,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-06 10:00:00",
    "lat": -63.98259,
    "lon": -9.56417,
    "alt_m": 12183.6
   },
   "member_spread_deg": {
    "lat": 16.91,
    "lon": 182.13
   },
   "member_spread_now_deg": {
    "lat": 0.26,
    "lon": 1.71
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 23:41:33",
   "seed_lat": 40.91667,
   "seed_lon": -112.33333,
   "seed_alt_m": 13190.0,
   "seed_age_h": 11.64,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 05:45:00",
    "lat": 22.14058,
    "lon": -71.62641,
    "alt_m": 13795.6
   },
   "member_spread_deg": {
    "lat": 22.52,
    "lon": 93.64
   },
   "member_spread_now_deg": {
    "lat": 4.02,
    "lon": 7.67
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 10:56:20",
   "seed_lat": 16.72917,
   "seed_lon": -41.16667,
   "seed_alt_m": 13540.0,
   "seed_age_h": 0.4,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 11:00:00",
    "lat": 32.76213,
    "lon": 108.45758,
    "alt_m": 13390.5
   },
   "member_spread_deg": {
    "lat": 27.88,
    "lon": 113.75
   },
   "member_spread_now_deg": {
    "lat": 0.04,
    "lon": 0.04
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 22:19:48",
   "seed_lat": 57.77083,
   "seed_lon": -110.79167,
   "seed_alt_m": 13260.0,
   "seed_age_h": 13.0,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 05:45:00",
    "lat": 48.64944,
    "lon": 61.12674,
    "alt_m": 13502.7
   },
   "member_spread_deg": {
    "lat": 30.22,
    "lon": 157.9
   },
   "member_spread_now_deg": {
    "lat": 1.09,
    "lon": 3.22
   },
   "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": 219.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-06 05:30:00",
    "lat": 44.99887,
    "lon": -66.47155,
    "alt_m": 11140.8
   },
   "member_spread_deg": {
    "lat": 29.23,
    "lon": 277.95
   },
   "member_spread_now_deg": {
    "lat": 24.07,
    "lon": 283.51
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 10:54:02",
   "seed_lat": 25.79167,
   "seed_lon": 0.625,
   "seed_alt_m": 12660.0,
   "seed_age_h": 0.43,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 11:00:00",
    "lat": 49.30646,
    "lon": -121.80785,
    "alt_m": 12358.2
   },
   "member_spread_deg": {
    "lat": 10.66,
    "lon": 327.63
   },
   "member_spread_now_deg": {
    "lat": 0.03,
    "lon": 0.2
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 10:55:32",
   "seed_lat": 25.77526,
   "seed_lon": 0.64827,
   "seed_alt_m": 12660.0,
   "seed_age_h": 0.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 11:00:00",
    "lat": 49.23799,
    "lon": -122.18923,
    "alt_m": 12363.8
   },
   "member_spread_deg": {
    "lat": 10.63,
    "lon": 328.16
   },
   "member_spread_now_deg": {
    "lat": 0.02,
    "lon": 0.2
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-30",
   "flight_id": "DG2GG-30_2026-08-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 05:11:00",
   "seed_lat": 52.08333,
   "seed_lon": 135.45833,
   "seed_alt_m": 12450.0,
   "seed_age_h": 6.15,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 05:45:00",
    "lat": 69.58049,
    "lon": -18.53878,
    "alt_m": 11943.5
   },
   "member_spread_deg": {
    "lat": 17.13,
    "lon": 82.21
   },
   "member_spread_now_deg": {
    "lat": 1.55,
    "lon": 0.57
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-31",
   "flight_id": "DG2GG-31_2026-08-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 14:02:00",
   "seed_lat": 21.33333,
   "seed_lon": -81.66667,
   "seed_alt_m": 13590.0,
   "seed_age_h": 21.3,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 05:30:00",
    "lat": 32.18071,
    "lon": 39.51986,
    "alt_m": 13503.4
   },
   "member_spread_deg": {
    "lat": 13.58,
    "lon": 108.12
   },
   "member_spread_now_deg": {
    "lat": 2.43,
    "lon": 3.28
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-32",
   "flight_id": "DG2GG-32_2026-09-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 13:06:00",
   "seed_lat": 49.22917,
   "seed_lon": -43.25,
   "seed_alt_m": 13080.0,
   "seed_age_h": 22.23,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 05:30:00",
    "lat": 57.21014,
    "lon": 106.32927,
    "alt_m": 13256.5
   },
   "member_spread_deg": {
    "lat": 35.95,
    "lon": 79.98
   },
   "member_spread_now_deg": {
    "lat": 13.29,
    "lon": 1.59
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 00:05:00",
   "seed_lat": 32.875,
   "seed_lon": -134.54167,
   "seed_alt_m": 13430.0,
   "seed_age_h": 11.25,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 05:30:00",
    "lat": 21.30674,
    "lon": -60.98124,
    "alt_m": 13657.8
   },
   "member_spread_deg": {
    "lat": 32.4,
    "lon": 75.44
   },
   "member_spread_now_deg": {
    "lat": 1.89,
    "lon": 7.66
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-36",
   "flight_id": "DG2GG-36_2026-09-26",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 10:10:00",
   "seed_lat": 38.97917,
   "seed_lon": 47.125,
   "seed_alt_m": 13140.0,
   "seed_age_h": 1.17,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 09:45:00",
    "lat": 39.47995,
    "lon": -135.11899,
    "alt_m": 13367.5
   },
   "member_spread_deg": {
    "lat": 14.02,
    "lon": 75.22
   },
   "member_spread_now_deg": {
    "lat": 0.05,
    "lon": 0.73
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DH1PR-578",
   "flight_id": "DH1PR-578_2026-09-27",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 10:56:17",
   "seed_lat": 36.41667,
   "seed_lon": 16.83333,
   "seed_alt_m": 11640.0,
   "seed_age_h": 0.4,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-06 11:00:00",
    "lat": 55.20309,
    "lon": -132.0941,
    "alt_m": 11332.9
   },
   "member_spread_deg": {
    "lat": 9.66,
    "lon": 22.48
   },
   "member_spread_now_deg": {
    "lat": 0.02,
    "lon": 0.07
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DH1PR-578e",
   "flight_id": "DH1PR-578e_2026-09-27",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 10:57:01",
   "seed_lat": 36.39835,
   "seed_lon": 16.83125,
   "seed_alt_m": 11640.0,
   "seed_age_h": 0.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-06 11:00:00",
    "lat": 55.24962,
    "lon": -131.58865,
    "alt_m": 11333.0
   },
   "member_spread_deg": {
    "lat": 9.74,
    "lon": 23.03
   },
   "member_spread_now_deg": {
    "lat": 0.02,
    "lon": 0.07
   },
   "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": 262.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 05:45:00",
    "lat": 4.77639,
    "lon": -60.9703,
    "alt_m": 15313.4
   },
   "member_spread_deg": {
    "lat": 47.76,
    "lon": 255.92
   },
   "member_spread_now_deg": {
    "lat": 49.43,
    "lon": 124.5
   },
   "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": 267.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 05:30:00",
    "lat": 79.87201,
    "lon": 68.59943,
    "alt_m": 13946.8
   },
   "member_spread_deg": {
    "lat": 31.59,
    "lon": 77.65
   },
   "member_spread_now_deg": {
    "lat": 22.49,
    "lon": 80.65
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "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": 238.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-06 05:45:00",
    "lat": 25.66573,
    "lon": -56.01017,
    "alt_m": 14394.0
   },
   "member_spread_deg": {
    "lat": 42.31,
    "lon": 224.73
   },
   "member_spread_now_deg": {
    "lat": 57.71,
    "lon": 316.01
   },
   "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": 63.64,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 05:45:00",
    "lat": 54.19407,
    "lon": 105.90797,
    "alt_m": 14197.6
   },
   "member_spread_deg": {
    "lat": 32.26,
    "lon": 119.85
   },
   "member_spread_now_deg": {
    "lat": 23.95,
    "lon": 43.25
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 10:33:00",
   "seed_lat": 39.8125,
   "seed_lon": 15.125,
   "seed_alt_m": 13370.0,
   "seed_age_h": 0.78,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 10:00:00",
    "lat": 45.16432,
    "lon": -157.99989,
    "alt_m": 12942.5
   },
   "member_spread_deg": {
    "lat": 13.41,
    "lon": 340.5
   },
   "member_spread_now_deg": {
    "lat": 0.11,
    "lon": 0.12
   },
   "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": 324.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-06 05:45:00",
    "lat": 38.22843,
    "lon": -154.6262,
    "alt_m": 13652.8
   },
   "member_spread_deg": {
    "lat": 72.84,
    "lon": 313.22
   },
   "member_spread_now_deg": {
    "lat": 31.4,
    "lon": 225.58
   },
   "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": 222.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 05:30:00",
    "lat": 31.69589,
    "lon": 17.99974,
    "alt_m": 13156.5
   },
   "member_spread_deg": {
    "lat": 32.64,
    "lon": 264.31
   },
   "member_spread_now_deg": {
    "lat": 22.97,
    "lon": 172.9
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KI6DS-11",
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 ]
}