{
 "generated_utc": "2026-09-29T23:27:07Z",
 "gfs_cycle_utc": "2026-09-29T18:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 442.0,
  "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_20260929_18Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260929_18Z.geojson.gz"
 },
 "counts": {
  "flights": 49,
  "members": 9,
  "rows": 199818
 },
 "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": 151.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 17:45:00",
    "lat": 48.13767,
    "lon": -131.18439,
    "alt_m": 13227.4
   },
   "member_spread_deg": {
    "lat": 40.62,
    "lon": 85.15
   },
   "member_spread_now_deg": {
    "lat": 32.5,
    "lon": 92.85
   },
   "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 14:00:00",
   "seed_lat": 38.2083,
   "seed_lon": 33.29167,
   "seed_alt_m": 13150.0,
   "seed_age_h": 9.33,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 17:30:00",
    "lat": 33.11161,
    "lon": -109.84814,
    "alt_m": 13369.5
   },
   "member_spread_deg": {
    "lat": 30.06,
    "lon": 60.41
   },
   "member_spread_now_deg": {
    "lat": 0.42,
    "lon": 3.56
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 10:58:40",
   "seed_lat": -67.5625,
   "seed_lon": 74.41668,
   "seed_alt_m": 12150.0,
   "seed_age_h": 12.36,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-06 17:30:00",
    "lat": -69.25675,
    "lon": -20.29138,
    "alt_m": 12169.6
   },
   "member_spread_deg": {
    "lat": 24.64,
    "lon": 303.51
   },
   "member_spread_now_deg": {
    "lat": 3.7,
    "lon": 27.59
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 21:18:47",
   "seed_lat": 44.66667,
   "seed_lon": -85.45833,
   "seed_alt_m": 13470.0,
   "seed_age_h": 2.02,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 20:45:00",
    "lat": 19.66792,
    "lon": -70.61875,
    "alt_m": 13779.4
   },
   "member_spread_deg": {
    "lat": 20.68,
    "lon": 49.38
   },
   "member_spread_now_deg": {
    "lat": 1.09,
    "lon": 0.91
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 19:40:18",
   "seed_lat": 20.66667,
   "seed_lon": -36.54167,
   "seed_alt_m": 13540.0,
   "seed_age_h": 3.66,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 19:15:00",
    "lat": 41.46599,
    "lon": 99.53403,
    "alt_m": 13342.3
   },
   "member_spread_deg": {
    "lat": 9.29,
    "lon": 26.34
   },
   "member_spread_now_deg": {
    "lat": 0.94,
    "lon": 0.45
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 18:31:18",
   "seed_lat": 59.27083,
   "seed_lon": -89.66667,
   "seed_alt_m": 13210.0,
   "seed_age_h": 4.81,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 18:00:00",
    "lat": 47.28242,
    "lon": 58.26829,
    "alt_m": 13662.4
   },
   "member_spread_deg": {
    "lat": 23.82,
    "lon": 323.95
   },
   "member_spread_now_deg": {
    "lat": 0.49,
    "lon": 2.26
   },
   "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": 231.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-06 17:30:00",
    "lat": 37.85728,
    "lon": -123.07045,
    "alt_m": 11435.2
   },
   "member_spread_deg": {
    "lat": 34.86,
    "lon": 288.21
   },
   "member_spread_now_deg": {
    "lat": 20.53,
    "lon": 307.37
   },
   "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 15:39:47",
   "seed_lat": 26.54167,
   "seed_lon": 4.83333,
   "seed_alt_m": 12680.0,
   "seed_age_h": 7.67,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 17:45:00",
    "lat": 50.22032,
    "lon": -127.20493,
    "alt_m": 12457.5
   },
   "member_spread_deg": {
    "lat": 17.78,
    "lon": 61.69
   },
   "member_spread_now_deg": {
    "lat": 0.8,
    "lon": 3.04
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 14:55:32",
   "seed_lat": 26.44306,
   "seed_lon": 4.26233,
   "seed_alt_m": 12700.0,
   "seed_age_h": 8.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 17:30:00",
    "lat": 48.03388,
    "lon": -120.20782,
    "alt_m": 12524.9
   },
   "member_spread_deg": {
    "lat": 18.04,
    "lon": 61.53
   },
   "member_spread_now_deg": {
    "lat": 1.29,
    "lon": 3.13
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-30",
   "flight_id": "DG2GG-30_2026-08-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 22:21:00",
   "seed_lat": 53.54167,
   "seed_lon": 150.375,
   "seed_alt_m": 12340.0,
   "seed_age_h": 0.98,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 21:45:00",
    "lat": 44.979,
    "lon": -18.2129,
    "alt_m": 13021.0
   },
   "member_spread_deg": {
    "lat": 18.25,
    "lon": 82.38
   },
   "member_spread_now_deg": {
    "lat": 0.09,
    "lon": 0.77
   },
   "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": 33.3,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 17:30:00",
    "lat": 26.51356,
    "lon": 7.77735,
    "alt_m": 13577.8
   },
   "member_spread_deg": {
    "lat": 19.71,
    "lon": 100.49
   },
   "member_spread_now_deg": {
    "lat": 6.05,
    "lon": 5.8
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-32",
   "flight_id": "DG2GG-32_2026-09-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 14:26:00",
   "seed_lat": 56.64583,
   "seed_lon": -16.75,
   "seed_alt_m": 13030.0,
   "seed_age_h": 8.9,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 17:30:00",
    "lat": 53.92158,
    "lon": 89.50893,
    "alt_m": 12842.8
   },
   "member_spread_deg": {
    "lat": 20.12,
    "lon": 328.56
   },
   "member_spread_now_deg": {
    "lat": 3.69,
    "lon": 7.46
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 22:25:00",
   "seed_lat": 33.20833,
   "seed_lon": -119.625,
   "seed_alt_m": 13340.0,
   "seed_age_h": 0.92,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 22:00:00",
    "lat": 21.53103,
    "lon": -70.01655,
    "alt_m": 13676.2
   },
   "member_spread_deg": {
    "lat": 39.25,
    "lon": 97.17
   },
   "member_spread_now_deg": {
    "lat": 0.45,
    "lon": 0.59
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-36",
   "flight_id": "DG2GG-36_2026-09-26",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 11:05:00",
   "seed_lat": 38.95833,
   "seed_lon": 48.08333,
   "seed_alt_m": 13120.0,
   "seed_age_h": 12.25,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 17:30:00",
    "lat": 43.80222,
    "lon": -133.55471,
    "alt_m": 13242.0
   },
   "member_spread_deg": {
    "lat": 16.1,
    "lon": 74.86
   },
   "member_spread_now_deg": {
    "lat": 0.74,
    "lon": 4.68
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DH1PR-578",
   "flight_id": "DH1PR-578_2026-09-27",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 16:36:01",
   "seed_lat": 35.54167,
   "seed_lon": 18.33333,
   "seed_alt_m": 11610.0,
   "seed_age_h": 6.73,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-06 17:30:00",
    "lat": 52.39577,
    "lon": -110.58818,
    "alt_m": 11210.4
   },
   "member_spread_deg": {
    "lat": 7.98,
    "lon": 35.88
   },
   "member_spread_now_deg": {
    "lat": 0.14,
    "lon": 0.68
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DH1PR-578e",
   "flight_id": "DH1PR-578e_2026-09-27",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 16:37:32",
   "seed_lat": 35.54141,
   "seed_lon": 18.3408,
   "seed_alt_m": 11610.0,
   "seed_age_h": 6.71,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-06 17:45:00",
    "lat": 52.51176,
    "lon": -110.61719,
    "alt_m": 11210.9
   },
   "member_spread_deg": {
    "lat": 7.28,
    "lon": 34.85
   },
   "member_spread_now_deg": {
    "lat": 0.19,
    "lon": 0.7
   },
   "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": 274.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 17:45:00",
    "lat": 7.67517,
    "lon": -38.17802,
    "alt_m": 15290.5
   },
   "member_spread_deg": {
    "lat": 48.11,
    "lon": 292.45
   },
   "member_spread_now_deg": {
    "lat": 47.11,
    "lon": 130.89
   },
   "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": 279.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 17:30:00",
    "lat": 76.25391,
    "lon": 74.12823,
    "alt_m": 13994.4
   },
   "member_spread_deg": {
    "lat": 27.42,
    "lon": 134.61
   },
   "member_spread_now_deg": {
    "lat": 30.8,
    "lon": 51.06
   },
   "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": 250.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-06 17:45:00",
    "lat": 21.58873,
    "lon": -14.97765,
    "alt_m": 14329.4
   },
   "member_spread_deg": {
    "lat": 59.8,
    "lon": 324.63
   },
   "member_spread_now_deg": {
    "lat": 57.87,
    "lon": 307.21
   },
   "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": 75.64,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 17:45:00",
    "lat": 41.23161,
    "lon": 114.11327,
    "alt_m": 14230.1
   },
   "member_spread_deg": {
    "lat": 19.66,
    "lon": 330.82
   },
   "member_spread_now_deg": {
    "lat": 23.17,
    "lon": 40.08
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 14:35:30",
   "seed_lat": 39.125,
   "seed_lon": 15.33333,
   "seed_alt_m": 13350.0,
   "seed_age_h": 8.74,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 17:30:00",
    "lat": 40.78906,
    "lon": -157.5645,
    "alt_m": 13018.5
   },
   "member_spread_deg": {
    "lat": 18.72,
    "lon": 344.34
   },
   "member_spread_now_deg": {
    "lat": 1.18,
    "lon": 0.51
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 234.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 17:30:00",
    "lat": 36.94776,
    "lon": 23.56255,
    "alt_m": 13084.7
   },
   "member_spread_deg": {
    "lat": 26.64,
    "lon": 282.55
   },
   "member_spread_now_deg": {
    "lat": 23.05,
    "lon": 176.84
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 17:55:45",
   "seed_lat": 51.62495,
   "seed_lon": -26.12498,
   "seed_alt_m": 12960.0,
   "seed_age_h": 5.4,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 17:30:00",
    "lat": 61.50564,
    "lon": 172.1101,
    "alt_m": 12981.8
   },
   "member_spread_deg": {
    "lat": 8.73,
    "lon": 63.79
   },
   "member_spread_now_deg": {
    "lat": 1.27,
    "lon": 0.85
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KJ4AWK-1",
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  }
 ]
}