{
 "generated_utc": "2026-09-28T17:28:11Z",
 "gfs_cycle_utc": "2026-09-28T12:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 495.5,
  "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_12Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260928_12Z.geojson.gz"
 },
 "counts": {
  "flights": 48,
  "members": 9,
  "rows": 206586
 },
 "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": 121.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 11:45:00",
    "lat": 54.95072,
    "lon": -110.18794,
    "alt_m": 13093.8
   },
   "member_spread_deg": {
    "lat": 28.63,
    "lon": 300.23
   },
   "member_spread_now_deg": {
    "lat": 33.38,
    "lon": 85.43
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "AE4ZZ-23",
   "flight_id": "AE4ZZ-23_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 09:12:30",
   "seed_lat": 29.7708,
   "seed_lon": 16.33334,
   "seed_alt_m": 13380.0,
   "seed_age_h": 8.13,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 11:45:00",
    "lat": 59.7659,
    "lon": -121.26185,
    "alt_m": 12958.3
   },
   "member_spread_deg": {
    "lat": 27.91,
    "lon": 35.96
   },
   "member_spread_now_deg": {
    "lat": 0.74,
    "lon": 1.02
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 15:48:40",
   "seed_lat": -62.25,
   "seed_lon": 15.79168,
   "seed_alt_m": 12090.0,
   "seed_age_h": 1.52,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-05 15:15:00",
    "lat": -70.33595,
    "lon": -26.09815,
    "alt_m": 12442.4
   },
   "member_spread_deg": {
    "lat": 31.63,
    "lon": 245.69
   },
   "member_spread_now_deg": {
    "lat": 0.27,
    "lon": 0.66
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 15:29:48",
   "seed_lat": 36.41667,
   "seed_lon": -119.41667,
   "seed_alt_m": 13290.0,
   "seed_age_h": 1.84,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 15:00:00",
    "lat": 23.85191,
    "lon": -42.9081,
    "alt_m": 13898.1
   },
   "member_spread_deg": {
    "lat": 37.17,
    "lon": 141.57
   },
   "member_spread_now_deg": {
    "lat": 0.45,
    "lon": 0.7
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 16:49:18",
   "seed_lat": 25.52083,
   "seed_lon": -41.95833,
   "seed_alt_m": 13620.0,
   "seed_age_h": 0.51,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 16:15:00",
    "lat": 40.76573,
    "lon": 77.87184,
    "alt_m": 13193.9
   },
   "member_spread_deg": {
    "lat": 20.77,
    "lon": 62.89
   },
   "member_spread_now_deg": {
    "lat": 0.04,
    "lon": 0.05
   },
   "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": 19.76,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 11:30:00",
    "lat": 55.1078,
    "lon": 55.21812,
    "alt_m": 13350.1
   },
   "member_spread_deg": {
    "lat": 26.76,
    "lon": 144.46
   },
   "member_spread_now_deg": {
    "lat": 1.16,
    "lon": 8.15
   },
   "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": 201.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-05 11:30:00",
    "lat": 56.12411,
    "lon": 8.09529,
    "alt_m": 11527.7
   },
   "member_spread_deg": {
    "lat": 33.79,
    "lon": 254.01
   },
   "member_spread_now_deg": {
    "lat": 25.79,
    "lon": 275.9
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 16:44:17",
   "seed_lat": 31.29167,
   "seed_lon": -9.75,
   "seed_alt_m": 12650.0,
   "seed_age_h": 0.6,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 16:15:00",
    "lat": 52.02259,
    "lon": -129.24787,
    "alt_m": 12299.9
   },
   "member_spread_deg": {
    "lat": 18.55,
    "lon": 332.8
   },
   "member_spread_now_deg": {
    "lat": 0.18,
    "lon": 0.11
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 16:34:32",
   "seed_lat": 31.41754,
   "seed_lon": -9.8375,
   "seed_alt_m": 12650.0,
   "seed_age_h": 0.76,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 16:00:00",
    "lat": 51.9776,
    "lon": -129.57908,
    "alt_m": 12299.6
   },
   "member_spread_deg": {
    "lat": 21.26,
    "lon": 332.81
   },
   "member_spread_now_deg": {
    "lat": 0.36,
    "lon": 0.21
   },
   "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": 13.98,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-05 11:45:00",
    "lat": 72.62455,
    "lon": -4.02424,
    "alt_m": 11912.6
   },
   "member_spread_deg": {
    "lat": 17.59,
    "lon": 86.82
   },
   "member_spread_now_deg": {
    "lat": 4.28,
    "lon": 5.77
   },
   "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": 3.3,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 13:30:00",
    "lat": 36.54727,
    "lon": 49.48306,
    "alt_m": 13438.3
   },
   "member_spread_deg": {
    "lat": 23.13,
    "lon": 112.79
   },
   "member_spread_now_deg": {
    "lat": 0.87,
    "lon": 0.26
   },
   "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": 4.23,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 12:30:00",
    "lat": 44.26711,
    "lon": 68.15371,
    "alt_m": 13066.5
   },
   "member_spread_deg": {
    "lat": 33.53,
    "lon": 77.18
   },
   "member_spread_now_deg": {
    "lat": 1.09,
    "lon": 2.85
   },
   "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": 17.17,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 11:45:00",
    "lat": 12.75551,
    "lon": -72.93507,
    "alt_m": 13668.7
   },
   "member_spread_deg": {
    "lat": 43.57,
    "lon": 67.98
   },
   "member_spread_now_deg": {
    "lat": 2.44,
    "lon": 11.39
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-36",
   "flight_id": "DG2GG-36_2026-09-26",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 13:20:00",
   "seed_lat": 37.95833,
   "seed_lon": 26.0,
   "seed_alt_m": 13150.0,
   "seed_age_h": 4.0,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 12:45:00",
    "lat": 43.66967,
    "lon": -132.0494,
    "alt_m": 13361.5
   },
   "member_spread_deg": {
    "lat": 22.84,
    "lon": 69.98
   },
   "member_spread_now_deg": {
    "lat": 0.99,
    "lon": 1.74
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DH1PR-578",
   "flight_id": "DH1PR-578_2026-09-27",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 16:45:47",
   "seed_lat": 40.125,
   "seed_lon": 15.95833,
   "seed_alt_m": 11650.0,
   "seed_age_h": 0.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-05 16:15:00",
    "lat": 42.57197,
    "lon": 175.30315,
    "alt_m": 11323.3
   },
   "member_spread_deg": {
    "lat": 18.03,
    "lon": 354.57
   },
   "member_spread_now_deg": {
    "lat": 0.04,
    "lon": 0.1
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DH1PR-578e",
   "flight_id": "DH1PR-578e_2026-09-27",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 16:46:32",
   "seed_lat": 40.13889,
   "seed_lon": 15.95504,
   "seed_alt_m": 11650.0,
   "seed_age_h": 0.56,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-05 16:15:00",
    "lat": 42.58455,
    "lon": 175.28567,
    "alt_m": 11323.0
   },
   "member_spread_deg": {
    "lat": 18.0,
    "lon": 355.13
   },
   "member_spread_now_deg": {
    "lat": 0.04,
    "lon": 0.1
   },
   "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": 244.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 11:45:00",
    "lat": 6.55876,
    "lon": -44.60358,
    "alt_m": 15351.7
   },
   "member_spread_deg": {
    "lat": 59.92,
    "lon": 305.15
   },
   "member_spread_now_deg": {
    "lat": 49.3,
    "lon": 116.06
   },
   "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": 249.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 11:30:00",
    "lat": 45.85016,
    "lon": 42.75423,
    "alt_m": 14684.9
   },
   "member_spread_deg": {
    "lat": 31.68,
    "lon": 94.41
   },
   "member_spread_now_deg": {
    "lat": 13.32,
    "lon": 79.19
   },
   "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": 220.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-05 11:45:00",
    "lat": 8.56752,
    "lon": -96.66897,
    "alt_m": 14414.2
   },
   "member_spread_deg": {
    "lat": 43.35,
    "lon": 286.26
   },
   "member_spread_now_deg": {
    "lat": 55.55,
    "lon": 327.46
   },
   "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": 45.64,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 11:45:00",
    "lat": 60.96862,
    "lon": 80.2762,
    "alt_m": 13786.7
   },
   "member_spread_deg": {
    "lat": 36.3,
    "lon": 71.93
   },
   "member_spread_now_deg": {
    "lat": 19.65,
    "lon": 38.81
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 14:33:00",
   "seed_lat": 45.1875,
   "seed_lon": 13.41667,
   "seed_alt_m": 13410.0,
   "seed_age_h": 2.78,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 14:00:00",
    "lat": 46.41365,
    "lon": 168.53222,
    "alt_m": 12993.2
   },
   "member_spread_deg": {
    "lat": 8.12,
    "lon": 357.28
   },
   "member_spread_now_deg": {
    "lat": 0.18,
    "lon": 0.27
   },
   "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": 306.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-05 11:45:00",
    "lat": 34.17838,
    "lon": -175.72035,
    "alt_m": 13850.1
   },
   "member_spread_deg": {
    "lat": 47.49,
    "lon": 236.44
   },
   "member_spread_now_deg": {
    "lat": 29.78,
    "lon": 182.26
   },
   "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": 204.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 11:30:00",
    "lat": 45.48393,
    "lon": 109.28907,
    "alt_m": 12806.7
   },
   "member_spread_deg": {
    "lat": 27.67,
    "lon": 158.8
   },
   "member_spread_now_deg": {
    "lat": 26.8,
    "lon": 159.73
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KI6DS-11",
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   "display_as": "track",
   "display_reason": "fresh"
  }
 ]
}