{
 "generated_utc": "2026-09-24T05:27:58Z",
 "gfs_cycle_utc": "2026-09-24T00:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 498.0,
  "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_20260924_00Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260924_00Z.geojson.gz"
 },
 "counts": {
  "flights": 50,
  "members": 9,
  "rows": 215928
 },
 "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": 13.69,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 23:45:00",
    "lat": 46.80843,
    "lon": 83.50646,
    "alt_m": 13135.5
   },
   "member_spread_deg": {
    "lat": 27.42,
    "lon": 105.9
   },
   "member_spread_now_deg": {
    "lat": 4.89,
    "lon": 6.45
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AE4ZZ-23",
   "flight_id": "AE4ZZ-23_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 17:15:00",
   "seed_lat": 41.72914,
   "seed_lon": -38.45829,
   "seed_alt_m": 13520.0,
   "seed_age_h": 12.08,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 23:45:00",
    "lat": 45.18165,
    "lon": 98.68602,
    "alt_m": 13081.5
   },
   "member_spread_deg": {
    "lat": 28.51,
    "lon": 89.09
   },
   "member_spread_now_deg": {
    "lat": 2.52,
    "lon": 1.79
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 04:53:40",
   "seed_lat": -68.33333,
   "seed_lon": 97.37501,
   "seed_alt_m": 12180.0,
   "seed_age_h": 0.44,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-01 05:00:00",
    "lat": -57.26717,
    "lon": 87.70657,
    "alt_m": 11869.8
   },
   "member_spread_deg": {
    "lat": 18.46,
    "lon": 41.01
   },
   "member_spread_now_deg": {
    "lat": 0.15,
    "lon": 0.18
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AIRCOR-6",
   "flight_id": "AIRCOR-6_2026-09-14",
   "payload_type": "APRS",
   "seed_time": "2026-09-23 15:39:13",
   "seed_lat": 40.33008,
   "seed_lon": -104.83542,
   "seed_alt_m": 15554.0,
   "seed_age_h": 13.68,
   "float_reliable": false,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 23:45:00",
    "lat": 27.59921,
    "lon": -53.47384,
    "alt_m": 15833.6
   },
   "member_spread_deg": {
    "lat": 21.29,
    "lon": 82.4
   },
   "member_spread_now_deg": {
    "lat": 3.26,
    "lon": 10.88
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 04:34:19",
   "seed_lat": 26.125,
   "seed_lon": 166.45833,
   "seed_alt_m": 13790.0,
   "seed_age_h": 0.76,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-01 04:00:00",
    "lat": 53.12677,
    "lon": -52.3327,
    "alt_m": 13354.3
   },
   "member_spread_deg": {
    "lat": 27.86,
    "lon": 62.86
   },
   "member_spread_now_deg": {
    "lat": 0.41,
    "lon": 0.28
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 01:50:47",
   "seed_lat": 44.27083,
   "seed_lon": -126.20833,
   "seed_alt_m": 13120.0,
   "seed_age_h": 3.49,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 01:15:00",
    "lat": 36.47592,
    "lon": 40.22636,
    "alt_m": 13048.8
   },
   "member_spread_deg": {
    "lat": 22.4,
    "lon": 98.18
   },
   "member_spread_now_deg": {
    "lat": 0.65,
    "lon": 1.13
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 10:36:18",
   "seed_lat": 44.4375,
   "seed_lon": 73.16667,
   "seed_alt_m": 13890.0,
   "seed_age_h": 18.73,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-30 23:30:00",
    "lat": 60.39961,
    "lon": -77.30066,
    "alt_m": 13572.1
   },
   "member_spread_deg": {
    "lat": 21.35,
    "lon": 115.67
   },
   "member_spread_now_deg": {
    "lat": 0.94,
    "lon": 6.85
   },
   "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": 93.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-30 23:30:00",
    "lat": 43.06025,
    "lon": -157.45333,
    "alt_m": 11532.1
   },
   "member_spread_deg": {
    "lat": 42.39,
    "lon": 244.97
   },
   "member_spread_now_deg": {
    "lat": 17.2,
    "lon": 67.41
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 00:34:32",
   "seed_lat": 46.5,
   "seed_lon": -128.75,
   "seed_alt_m": 12290.0,
   "seed_age_h": 4.76,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-01 00:00:00",
    "lat": 38.10382,
    "lon": 27.62569,
    "alt_m": 12140.1
   },
   "member_spread_deg": {
    "lat": 29.91,
    "lon": 63.7
   },
   "member_spread_now_deg": {
    "lat": 0.66,
    "lon": 3.05
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 00:34:32",
   "seed_lat": 46.49956,
   "seed_lon": -128.75018,
   "seed_alt_m": 12290.0,
   "seed_age_h": 4.76,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-01 00:00:00",
    "lat": 38.10185,
    "lon": 27.62657,
    "alt_m": 12140.0
   },
   "member_spread_deg": {
    "lat": 29.94,
    "lon": 63.73
   },
   "member_spread_now_deg": {
    "lat": 0.66,
    "lon": 3.05
   },
   "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": 15.98,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 23:45:00",
    "lat": 48.22767,
    "lon": 56.67278,
    "alt_m": 12675.1
   },
   "member_spread_deg": {
    "lat": 6.67,
    "lon": 109.31
   },
   "member_spread_now_deg": {
    "lat": 6.91,
    "lon": 5.64
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-31",
   "flight_id": "DG2GG-31_2026-08-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 02:12:00",
   "seed_lat": 49.75,
   "seed_lon": -175.875,
   "seed_alt_m": 12820.0,
   "seed_age_h": 3.13,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 01:45:00",
    "lat": 41.30407,
    "lon": -21.8012,
    "alt_m": 13226.6
   },
   "member_spread_deg": {
    "lat": 74.76,
    "lon": 112.27
   },
   "member_spread_now_deg": {
    "lat": 1.35,
    "lon": 1.46
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-32",
   "flight_id": "DG2GG-32_2026-09-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 00:36:00",
   "seed_lat": 52.60417,
   "seed_lon": -179.04167,
   "seed_alt_m": 12990.0,
   "seed_age_h": 4.73,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 00:00:00",
    "lat": 62.14678,
    "lon": 37.3409,
    "alt_m": 13329.4
   },
   "member_spread_deg": {
    "lat": 34.05,
    "lon": 108.86
   },
   "member_spread_now_deg": {
    "lat": 2.9,
    "lon": 4.06
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 04:10:00",
   "seed_lat": 21.375,
   "seed_lon": 160.95833,
   "seed_alt_m": 13490.0,
   "seed_age_h": 1.17,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 03:45:00",
    "lat": 37.34887,
    "lon": -119.33571,
    "alt_m": 13478.9
   },
   "member_spread_deg": {
    "lat": 31.73,
    "lon": 307.1
   },
   "member_spread_now_deg": {
    "lat": 0.3,
    "lon": 0.18
   },
   "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": 136.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 23:45:00",
    "lat": 1.32294,
    "lon": -39.06273,
    "alt_m": 15320.0
   },
   "member_spread_deg": {
    "lat": 57.25,
    "lon": 139.63
   },
   "member_spread_now_deg": {
    "lat": 39.66,
    "lon": 55.86
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "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": 141.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 23:30:00",
    "lat": 53.9693,
    "lon": -34.74784,
    "alt_m": 14209.0
   },
   "member_spread_deg": {
    "lat": 20.53,
    "lon": 46.84
   },
   "member_spread_now_deg": {
    "lat": 15.36,
    "lon": 359.25
   },
   "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": 112.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-30 23:45:00",
    "lat": 32.21976,
    "lon": -150.17468,
    "alt_m": 14250.1
   },
   "member_spread_deg": {
    "lat": 44.06,
    "lon": 317.24
   },
   "member_spread_now_deg": {
    "lat": 29.49,
    "lon": 350.2
   },
   "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": 2.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-01 02:15:00",
    "lat": 52.27614,
    "lon": -12.95516,
    "alt_m": 13642.9
   },
   "member_spread_deg": {
    "lat": 13.41,
    "lon": 28.04
   },
   "member_spread_now_deg": {
    "lat": 0.88,
    "lon": 1.41
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 17:58:00",
   "seed_lat": 42.97917,
   "seed_lon": -54.41667,
   "seed_alt_m": 13380.0,
   "seed_age_h": 11.37,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 23:30:00",
    "lat": 45.79473,
    "lon": 58.35961,
    "alt_m": 12967.5
   },
   "member_spread_deg": {
    "lat": 18.13,
    "lon": 345.29
   },
   "member_spread_now_deg": {
    "lat": 2.29,
    "lon": 12.32
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "I1RFQ",
   "flight_id": "I1RFQ_2026-09-06",
   "payload_type": "WSPR",
   "seed_time": "2026-09-10 05:25:00",
   "seed_lat": 48.52083,
   "seed_lon": 159.54167,
   "seed_alt_m": 12130.0,
   "seed_age_h": 335.92,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-30 23:30:00",
    "lat": 14.99124,
    "lon": -61.45211,
    "alt_m": 12705.5
   },
   "member_spread_deg": {
    "lat": 63.7,
    "lon": 238.11
   },
   "member_spread_now_deg": {
    "lat": 41.9,
    "lon": 221.0
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "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": 198.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 23:45:00",
    "lat": 28.56616,
    "lon": 61.69787,
    "alt_m": 13667.4
   },
   "member_spread_deg": {
    "lat": 28.35,
    "lon": 331.63
   },
   "member_spread_now_deg": {
    "lat": 42.05,
    "lon": 106.43
   },
   "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": 96.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 23:30:00",
    "lat": 42.40743,
    "lon": -50.22717,
    "alt_m": 13173.2
   },
   "member_spread_deg": {
    "lat": 36.05,
    "lon": 187.57
   },
   "member_spread_now_deg": {
    "lat": 12.75,
    "lon": 47.05
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "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": 287.25,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 23:30:00",
    "lat": 44.87691,
    "lon": -87.8799,
    "alt_m": 12425.0
   },
   "member_spread_deg": {
    "lat": 39.5,
    "lon": 333.79
   },
   "member_spread_now_deg": {
    "lat": 42.21,
    "lon": 192.33
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KE8RES-8",
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   "display_reason": "seed_age"
  },
  {
   "callsign": "WD4CFN-21",
   "flight_id": "WD4CFN-21_2026-09-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 12:35:33",
   "seed_lat": 21.45828,
   "seed_lon": 25.6251,
   "seed_alt_m": 13090.0,
   "seed_age_h": 16.74,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 23:30:00",
    "lat": 26.37986,
    "lon": 170.93669,
    "alt_m": 13207.2
   },
   "member_spread_deg": {
    "lat": 20.55,
    "lon": 350.12
   },
   "member_spread_now_deg": {
    "lat": 4.15,
    "lon": 3.67
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "ZS6WBT-1",
   "flight_id": "ZS6WBT-1_2026-08-19",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 03:43:30",
   "seed_lat": -12.5,
   "seed_lon": 161.45833,
   "seed_alt_m": 15957.0,
   "seed_age_h": 1.61,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-01 03:15:00",
    "lat": -28.83566,
    "lon": -76.71273,
    "alt_m": 15570.6
   },
   "member_spread_deg": {
    "lat": 12.77,
    "lon": 82.94
   },
   "member_spread_now_deg": {
    "lat": 0.19,
    "lon": 0.26
   },
   "display_as": "track",
   "display_reason": "fresh"
  }
 ]
}