{
 "generated_utc": "2026-09-25T17:27:55Z",
 "gfs_cycle_utc": "2026-09-25T12:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 485.5,
  "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_20260925_12Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260925_12Z.geojson.gz"
 },
 "counts": {
  "flights": 48,
  "members": 9,
  "rows": 211176
 },
 "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": 49.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 11:45:00",
    "lat": 45.45976,
    "lon": 143.6012,
    "alt_m": 12763.1
   },
   "member_spread_deg": {
    "lat": 20.45,
    "lon": 324.06
   },
   "member_spread_now_deg": {
    "lat": 34.0,
    "lon": 18.65
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AE4ZZ-23",
   "flight_id": "AE4ZZ-23_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 14:53:20",
   "seed_lat": 48.02081,
   "seed_lon": 10.87504,
   "seed_alt_m": 13390.0,
   "seed_age_h": 2.45,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 14:30:00",
    "lat": 48.51583,
    "lon": 156.60287,
    "alt_m": 12915.0
   },
   "member_spread_deg": {
    "lat": 11.19,
    "lon": 87.67
   },
   "member_spread_now_deg": {
    "lat": 0.73,
    "lon": 0.23
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 06:58:40",
   "seed_lat": -60.125,
   "seed_lon": 144.41668,
   "seed_alt_m": 12120.0,
   "seed_age_h": 10.36,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-02 11:30:00",
    "lat": -69.70158,
    "lon": 154.18049,
    "alt_m": 12008.7
   },
   "member_spread_deg": {
    "lat": 23.93,
    "lon": 70.21
   },
   "member_spread_now_deg": {
    "lat": 1.49,
    "lon": 8.06
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 04:51:18",
   "seed_lat": 32.4375,
   "seed_lon": 164.70833,
   "seed_alt_m": 13740.0,
   "seed_age_h": 12.48,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 11:45:00",
    "lat": 33.97087,
    "lon": -49.38213,
    "alt_m": 13806.7
   },
   "member_spread_deg": {
    "lat": 31.05,
    "lon": 39.66
   },
   "member_spread_now_deg": {
    "lat": 4.56,
    "lon": 5.56
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 17:02:47",
   "seed_lat": 48.0625,
   "seed_lon": -83.41667,
   "seed_alt_m": 13060.0,
   "seed_age_h": 0.29,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 17:00:00",
    "lat": 39.16516,
    "lon": 73.63035,
    "alt_m": 13182.7
   },
   "member_spread_deg": {
    "lat": 26.74,
    "lon": 105.64
   },
   "member_spread_now_deg": {
    "lat": 0.13,
    "lon": 0.29
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 07:20:18",
   "seed_lat": 44.39583,
   "seed_lon": 119.41667,
   "seed_alt_m": 13710.0,
   "seed_age_h": 10.0,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 11:45:00",
    "lat": 49.75317,
    "lon": -8.35697,
    "alt_m": 13867.9
   },
   "member_spread_deg": {
    "lat": 35.3,
    "lon": 76.67
   },
   "member_spread_now_deg": {
    "lat": 0.23,
    "lon": 2.81
   },
   "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": 129.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-02 11:30:00",
    "lat": 40.18913,
    "lon": -143.92388,
    "alt_m": 11619.3
   },
   "member_spread_deg": {
    "lat": 44.27,
    "lon": 304.07
   },
   "member_spread_now_deg": {
    "lat": 14.5,
    "lon": 115.6
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 16:44:16",
   "seed_lat": 47.33333,
   "seed_lon": -83.16667,
   "seed_alt_m": 12330.0,
   "seed_age_h": 0.6,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 16:15:00",
    "lat": 40.74235,
    "lon": 76.19218,
    "alt_m": 12408.1
   },
   "member_spread_deg": {
    "lat": 23.54,
    "lon": 116.95
   },
   "member_spread_now_deg": {
    "lat": 0.06,
    "lon": 0.28
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 16:45:02",
   "seed_lat": 47.34653,
   "seed_lon": -83.175,
   "seed_alt_m": 12330.0,
   "seed_age_h": 0.58,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 16:15:00",
    "lat": 41.30873,
    "lon": 75.48652,
    "alt_m": 12395.3
   },
   "member_spread_deg": {
    "lat": 20.16,
    "lon": 109.43
   },
   "member_spread_now_deg": {
    "lat": 0.06,
    "lon": 0.28
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-30",
   "flight_id": "DG2GG-30_2026-08-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 13:21:00",
   "seed_lat": 40.22917,
   "seed_lon": 25.54167,
   "seed_alt_m": 12550.0,
   "seed_age_h": 51.98,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 11:45:00",
    "lat": 55.65604,
    "lon": -137.6674,
    "alt_m": 12827.4
   },
   "member_spread_deg": {
    "lat": 20.35,
    "lon": 347.09
   },
   "member_spread_now_deg": {
    "lat": 13.46,
    "lon": 10.93
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-31",
   "flight_id": "DG2GG-31_2026-08-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 00:57:00",
   "seed_lat": 41.0,
   "seed_lon": -139.58333,
   "seed_alt_m": 13260.0,
   "seed_age_h": 16.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 11:30:00",
    "lat": 31.261,
    "lon": -21.21734,
    "alt_m": 13553.0
   },
   "member_spread_deg": {
    "lat": 55.39,
    "lon": 106.87
   },
   "member_spread_now_deg": {
    "lat": 3.63,
    "lon": 7.59
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-32",
   "flight_id": "DG2GG-32_2026-09-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 21:26:00",
   "seed_lat": 58.625,
   "seed_lon": -153.83333,
   "seed_alt_m": 13070.0,
   "seed_age_h": 19.9,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 11:30:00",
    "lat": 66.58498,
    "lon": -58.39606,
    "alt_m": 12473.2
   },
   "member_spread_deg": {
    "lat": 16.92,
    "lon": 108.16
   },
   "member_spread_now_deg": {
    "lat": 3.26,
    "lon": 5.52
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 04:25:00",
   "seed_lat": 28.02083,
   "seed_lon": 164.04167,
   "seed_alt_m": 13420.0,
   "seed_age_h": 12.92,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 11:30:00",
    "lat": 22.32094,
    "lon": -89.47114,
    "alt_m": 13474.3
   },
   "member_spread_deg": {
    "lat": 48.89,
    "lon": 39.04
   },
   "member_spread_now_deg": {
    "lat": 3.04,
    "lon": 1.49
   },
   "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": 172.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 11:45:00",
    "lat": 0.16825,
    "lon": -29.55848,
    "alt_m": 15340.3
   },
   "member_spread_deg": {
    "lat": 53.81,
    "lon": 308.81
   },
   "member_spread_now_deg": {
    "lat": 44.27,
    "lon": 79.18
   },
   "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": 177.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 11:30:00",
    "lat": 70.07807,
    "lon": -7.19449,
    "alt_m": 14180.1
   },
   "member_spread_deg": {
    "lat": 27.67,
    "lon": 33.84
   },
   "member_spread_now_deg": {
    "lat": 11.65,
    "lon": 37.87
   },
   "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": 148.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-02 11:45:00",
    "lat": 9.85868,
    "lon": -82.89938,
    "alt_m": 14451.6
   },
   "member_spread_deg": {
    "lat": 47.52,
    "lon": 349.86
   },
   "member_spread_now_deg": {
    "lat": 36.74,
    "lon": 345.85
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DO3GU-8",
   "flight_id": "DO3GU-8_2026-08-12",
   "payload_type": "APRS",
   "seed_time": "2026-09-24 02:46:08",
   "seed_lat": 45.11771,
   "seed_lon": 143.63833,
   "seed_alt_m": 13946.0,
   "seed_age_h": 38.57,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-02 11:45:00",
    "lat": 68.67335,
    "lon": -1.6311,
    "alt_m": 13711.7
   },
   "member_spread_deg": {
    "lat": 14.48,
    "lon": 18.92
   },
   "member_spread_now_deg": {
    "lat": 4.35,
    "lon": 19.09
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 16:43:00",
   "seed_lat": 40.25,
   "seed_lon": -18.16667,
   "seed_alt_m": 13530.0,
   "seed_age_h": 0.62,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 16:15:00",
    "lat": 44.13774,
    "lon": 78.98341,
    "alt_m": 13236.3
   },
   "member_spread_deg": {
    "lat": 10.28,
    "lon": 98.19
   },
   "member_spread_now_deg": {
    "lat": 0.1,
    "lon": 0.18
   },
   "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": 234.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-02 11:45:00",
    "lat": 34.81226,
    "lon": 78.62565,
    "alt_m": 13560.0
   },
   "member_spread_deg": {
    "lat": 42.52,
    "lon": 205.05
   },
   "member_spread_now_deg": {
    "lat": 49.63,
    "lon": 108.4
   },
   "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": 132.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 11:30:00",
    "lat": 34.22304,
    "lon": 14.67916,
    "alt_m": 13152.6
   },
   "member_spread_deg": {
    "lat": 28.42,
    "lon": 201.65
   },
   "member_spread_now_deg": {
    "lat": 27.71,
    "lon": 72.18
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KD7FXO-1",
   "flight_id": "KD7FXO-1_2026-08-02",
   "payload_type": "WSPR",
   "seed_time": "2026-09-12 06:05:00",
   "seed_lat": 45.47917,
   "seed_lon": 159.375,
   "seed_alt_m": 12660.0,
   "seed_age_h": 323.25,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 11:30:00",
    "lat": 47.43179,
    "lon": -25.85035,
    "alt_m": 12857.6
   },
   "member_spread_deg": {
    "lat": 34.74,
    "lon": 271.25
   },
   "member_spread_now_deg": {
    "lat": 24.95,
    "lon": 234.7
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KE8RES-8",
   "flight_id": "KE8RES-8_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-09-13 13:01:00",
   "seed_lat": 42.0625,
   "seed_lon": 28.04167,
   "seed_alt_m": 12700.0,
   "seed_age_h": 292.32,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 11:30:00",
    "lat": 66.07016,
    "lon": 85.28943,
    "alt_m": 12421.3
   },
   "member_spread_deg": {
    "lat": 37.57,
    "lon": 317.06
   },
   "member_spread_now_deg": {
    "lat": 26.32,
    "lon": 192.51
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 16:45:45",
   "seed_lat": 72.10411,
   "seed_lon": -70.54165,
   "seed_alt_m": 12840.0,
   "seed_age_h": 0.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-02 16:15:00",
    "lat": 80.09559,
    "lon": -12.87297,
    "alt_m": 12873.7
   },
   "member_spread_deg": {
    "lat": 37.29,
    "lon": 143.47
   },
   "member_spread_now_deg": {
    "lat": 0.11,
    "lon": 0.4
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KJ4AWK-1",
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  }
 ]
}