{
 "generated_utc": "2026-09-28T05:27:42Z",
 "gfs_cycle_utc": "2026-09-28T00:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 483.5,
  "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_20260928_00Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260928_00Z.geojson.gz"
 },
 "counts": {
  "flights": 47,
  "members": 9,
  "rows": 200286
 },
 "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": 109.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 23:45:00",
    "lat": 52.6471,
    "lon": -133.36048,
    "alt_m": 13102.1
   },
   "member_spread_deg": {
    "lat": 37.22,
    "lon": 54.27
   },
   "member_spread_now_deg": {
    "lat": 42.57,
    "lon": 87.53
   },
   "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": 15.0,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 23:45:00",
    "lat": 65.70451,
    "lon": -132.07064,
    "alt_m": 12585.1
   },
   "member_spread_deg": {
    "lat": 21.03,
    "lon": 304.98
   },
   "member_spread_now_deg": {
    "lat": 2.37,
    "lon": 0.92
   },
   "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": 31.77,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-04 23:30:00",
    "lat": -72.76951,
    "lon": -130.12889,
    "alt_m": 12110.3
   },
   "member_spread_deg": {
    "lat": 14.87,
    "lon": 328.54
   },
   "member_spread_now_deg": {
    "lat": 3.7,
    "lon": 21.83
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 00:45:18",
   "seed_lat": 36.91667,
   "seed_lon": -132.66667,
   "seed_alt_m": 13530.0,
   "seed_age_h": 4.58,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 00:15:00",
    "lat": 19.60822,
    "lon": -72.60418,
    "alt_m": 13935.4
   },
   "member_spread_deg": {
    "lat": 9.56,
    "lon": 33.22
   },
   "member_spread_now_deg": {
    "lat": 1.59,
    "lon": 0.75
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 18:14:18",
   "seed_lat": 26.75,
   "seed_lon": -31.79167,
   "seed_alt_m": 13660.0,
   "seed_age_h": 11.1,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 23:45:00",
    "lat": 39.39635,
    "lon": 50.89538,
    "alt_m": 13313.4
   },
   "member_spread_deg": {
    "lat": 22.25,
    "lon": 76.77
   },
   "member_spread_now_deg": {
    "lat": 1.53,
    "lon": 4.5
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 21:34:18",
   "seed_lat": 54.14583,
   "seed_lon": -137.125,
   "seed_alt_m": 13300.0,
   "seed_age_h": 7.76,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 23:30:00",
    "lat": 60.85046,
    "lon": 50.16555,
    "alt_m": 13421.7
   },
   "member_spread_deg": {
    "lat": 33.02,
    "lon": 154.03
   },
   "member_spread_now_deg": {
    "lat": 1.05,
    "lon": 4.15
   },
   "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": 189.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-04 23:30:00",
    "lat": 44.9351,
    "lon": -109.27056,
    "alt_m": 11517.3
   },
   "member_spread_deg": {
    "lat": 29.34,
    "lon": 194.79
   },
   "member_spread_now_deg": {
    "lat": 26.85,
    "lon": 300.01
   },
   "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 17:59:16",
   "seed_lat": 47.625,
   "seed_lon": -45.70833,
   "seed_alt_m": 12050.0,
   "seed_age_h": 11.35,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-04 23:30:00",
    "lat": 40.93332,
    "lon": 167.41856,
    "alt_m": 12452.5
   },
   "member_spread_deg": {
    "lat": 14.4,
    "lon": 79.15
   },
   "member_spread_now_deg": {
    "lat": 3.91,
    "lon": 5.5
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 17:19:31",
   "seed_lat": 48.06432,
   "seed_lon": -47.87257,
   "seed_alt_m": 11990.0,
   "seed_age_h": 12.01,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-04 23:45:00",
    "lat": 40.95987,
    "lon": 165.12993,
    "alt_m": 12354.7
   },
   "member_spread_deg": {
    "lat": 12.64,
    "lon": 72.54
   },
   "member_spread_now_deg": {
    "lat": 4.64,
    "lon": 6.2
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-30",
   "flight_id": "DG2GG-30_2026-08-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 03:21:00",
   "seed_lat": 49.54167,
   "seed_lon": 94.70833,
   "seed_alt_m": 12300.0,
   "seed_age_h": 1.98,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-05 02:45:00",
    "lat": 56.57175,
    "lon": -37.57614,
    "alt_m": 12097.3
   },
   "member_spread_deg": {
    "lat": 17.63,
    "lon": 91.17
   },
   "member_spread_now_deg": {
    "lat": 0.2,
    "lon": 0.68
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-31",
   "flight_id": "DG2GG-31_2026-08-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 21:47:00",
   "seed_lat": 25.35417,
   "seed_lon": -90.20833,
   "seed_alt_m": 13670.0,
   "seed_age_h": 7.55,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 23:45:00",
    "lat": 21.58293,
    "lon": -29.1232,
    "alt_m": 13713.4
   },
   "member_spread_deg": {
    "lat": 15.14,
    "lon": 89.46
   },
   "member_spread_now_deg": {
    "lat": 1.35,
    "lon": 2.25
   },
   "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": 30.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 23:45:00",
    "lat": 60.17274,
    "lon": 102.18475,
    "alt_m": 12810.8
   },
   "member_spread_deg": {
    "lat": 30.9,
    "lon": 87.79
   },
   "member_spread_now_deg": {
    "lat": 12.81,
    "lon": 21.55
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 00:10:00",
   "seed_lat": 34.95833,
   "seed_lon": -140.25,
   "seed_alt_m": 13400.0,
   "seed_age_h": 5.17,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 23:45:00",
    "lat": 19.13493,
    "lon": -81.3378,
    "alt_m": 13668.1
   },
   "member_spread_deg": {
    "lat": 60.76,
    "lon": 116.47
   },
   "member_spread_now_deg": {
    "lat": 0.68,
    "lon": 2.43
   },
   "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": 16.42,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 23:30:00",
    "lat": 59.0141,
    "lon": -154.48963,
    "alt_m": 12615.0
   },
   "member_spread_deg": {
    "lat": 16.15,
    "lon": 343.17
   },
   "member_spread_now_deg": {
    "lat": 2.66,
    "lon": 8.17
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DH1PR-578",
   "flight_id": "DH1PR-578_2026-09-27",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 16:56:17",
   "seed_lat": 49.91667,
   "seed_lon": 12.54167,
   "seed_alt_m": 11600.0,
   "seed_age_h": 12.4,
   "float_reliable": false,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-04 23:30:00",
    "lat": 51.32232,
    "lon": -157.8272,
    "alt_m": 11079.2
   },
   "member_spread_deg": {
    "lat": 18.45,
    "lon": 326.1
   },
   "member_spread_now_deg": {
    "lat": 3.86,
    "lon": 1.65
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DH1PR-578e",
   "flight_id": "DH1PR-578e_2026-09-27",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 16:57:02",
   "seed_lat": 49.91006,
   "seed_lon": 12.54636,
   "seed_alt_m": 11600.0,
   "seed_age_h": 12.38,
   "float_reliable": false,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-04 23:30:00",
    "lat": 51.16404,
    "lon": -158.07325,
    "alt_m": 11080.4
   },
   "member_spread_deg": {
    "lat": 21.19,
    "lon": 326.58
   },
   "member_spread_now_deg": {
    "lat": 3.85,
    "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": 232.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 23:45:00",
    "lat": 9.25779,
    "lon": -35.20048,
    "alt_m": 15327.5
   },
   "member_spread_deg": {
    "lat": 54.8,
    "lon": 278.33
   },
   "member_spread_now_deg": {
    "lat": 49.29,
    "lon": 104.34
   },
   "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": 237.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 23:30:00",
    "lat": 39.77063,
    "lon": 27.85433,
    "alt_m": 14664.6
   },
   "member_spread_deg": {
    "lat": 40.3,
    "lon": 65.56
   },
   "member_spread_now_deg": {
    "lat": 13.02,
    "lon": 64.8
   },
   "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": 208.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-04 23:45:00",
    "lat": 11.29179,
    "lon": -82.18292,
    "alt_m": 14462.9
   },
   "member_spread_deg": {
    "lat": 77.13,
    "lon": 206.1
   },
   "member_spread_now_deg": {
    "lat": 50.06,
    "lon": 334.61
   },
   "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": 33.64,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 23:45:00",
    "lat": 49.23488,
    "lon": 44.50891,
    "alt_m": 14111.9
   },
   "member_spread_deg": {
    "lat": 30.78,
    "lon": 56.2
   },
   "member_spread_now_deg": {
    "lat": 4.69,
    "lon": 30.8
   },
   "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": 14.87,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 23:30:00",
    "lat": 44.86793,
    "lon": 141.61285,
    "alt_m": 13106.6
   },
   "member_spread_deg": {
    "lat": 19.01,
    "lon": 303.63
   },
   "member_spread_now_deg": {
    "lat": 1.01,
    "lon": 2.23
   },
   "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": 294.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-04 23:45:00",
    "lat": 36.06911,
    "lon": 174.35423,
    "alt_m": 13750.2
   },
   "member_spread_deg": {
    "lat": 49.83,
    "lon": 299.9
   },
   "member_spread_now_deg": {
    "lat": 23.81,
    "lon": 159.52
   },
   "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": 192.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-04 23:30:00",
    "lat": 36.08934,
    "lon": 18.90468,
    "alt_m": 13181.5
   },
   "member_spread_deg": {
    "lat": 16.61,
    "lon": 186.88
   },
   "member_spread_now_deg": {
    "lat": 28.8,
    "lon": 137.88
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
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  {
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 ]
}