{
 "generated_utc": "2026-09-26T11:27:28Z",
 "gfs_cycle_utc": "2026-09-26T06:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 475.0,
  "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_20260926_06Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260926_06Z.geojson.gz"
 },
 "counts": {
  "flights": 47,
  "members": 9,
  "rows": 209016
 },
 "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": 67.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 05:45:00",
    "lat": 47.33544,
    "lon": 152.10533,
    "alt_m": 12622.4
   },
   "member_spread_deg": {
    "lat": 22.32,
    "lon": 355.56
   },
   "member_spread_now_deg": {
    "lat": 47.25,
    "lon": 44.74
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AE4ZZ-23",
   "flight_id": "AE4ZZ-23_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 11:00:00",
   "seed_lat": 37.49997,
   "seed_lon": 9.08336,
   "seed_alt_m": 13540.0,
   "seed_age_h": 0.33,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 11:00:00",
    "lat": 38.91498,
    "lon": 132.90919,
    "alt_m": 12996.2
   },
   "member_spread_deg": {
    "lat": 19.35,
    "lon": 352.72
   },
   "member_spread_now_deg": {
    "lat": 0.06,
    "lon": 0.06
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 04:03:40",
   "seed_lat": -68.29166,
   "seed_lon": -157.62499,
   "seed_alt_m": 12000.0,
   "seed_age_h": 7.27,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-03 05:30:00",
    "lat": -75.88102,
    "lon": -154.60459,
    "alt_m": 12182.3
   },
   "member_spread_deg": {
    "lat": 19.42,
    "lon": 296.39
   },
   "member_spread_now_deg": {
    "lat": 1.38,
    "lon": 5.7
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 05:21:19",
   "seed_lat": 41.54167,
   "seed_lon": -179.08333,
   "seed_alt_m": 13600.0,
   "seed_age_h": 5.98,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 05:45:00",
    "lat": 5.80012,
    "lon": -93.15867,
    "alt_m": 13973.0
   },
   "member_spread_deg": {
    "lat": 49.76,
    "lon": 15.87
   },
   "member_spread_now_deg": {
    "lat": 0.38,
    "lon": 2.94
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 20:38:18",
   "seed_lat": 48.0,
   "seed_lon": -80.91667,
   "seed_alt_m": 13080.0,
   "seed_age_h": 14.7,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 05:45:00",
    "lat": 43.34311,
    "lon": 96.47366,
    "alt_m": 13021.6
   },
   "member_spread_deg": {
    "lat": 21.94,
    "lon": 130.45
   },
   "member_spread_now_deg": {
    "lat": 4.25,
    "lon": 15.21
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 03:36:18",
   "seed_lat": 44.6875,
   "seed_lon": 150.83333,
   "seed_alt_m": 13610.0,
   "seed_age_h": 7.73,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 05:30:00",
    "lat": 44.16384,
    "lon": 1.61871,
    "alt_m": 14046.8
   },
   "member_spread_deg": {
    "lat": 36.36,
    "lon": 153.33
   },
   "member_spread_now_deg": {
    "lat": 0.17,
    "lon": 4.52
   },
   "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": 147.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-03 05:30:00",
    "lat": 41.43667,
    "lon": -111.23573,
    "alt_m": 11346.8
   },
   "member_spread_deg": {
    "lat": 36.39,
    "lon": 270.89
   },
   "member_spread_now_deg": {
    "lat": 18.78,
    "lon": 351.73
   },
   "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 21:03:46",
   "seed_lat": 46.58333,
   "seed_lon": -81.25,
   "seed_alt_m": 12320.0,
   "seed_age_h": 14.27,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 05:30:00",
    "lat": 35.17041,
    "lon": 46.80568,
    "alt_m": 12506.4
   },
   "member_spread_deg": {
    "lat": 35.94,
    "lon": 115.16
   },
   "member_spread_now_deg": {
    "lat": 4.31,
    "lon": 15.66
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 20:34:32",
   "seed_lat": 46.65512,
   "seed_lon": -81.43229,
   "seed_alt_m": 12330.0,
   "seed_age_h": 14.76,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 05:30:00",
    "lat": 36.90556,
    "lon": 114.81261,
    "alt_m": 12200.8
   },
   "member_spread_deg": {
    "lat": 34.62,
    "lon": 113.82
   },
   "member_spread_now_deg": {
    "lat": 4.54,
    "lon": 16.36
   },
   "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": 69.98,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 05:45:00",
    "lat": 45.2723,
    "lon": -122.64252,
    "alt_m": 12877.5
   },
   "member_spread_deg": {
    "lat": 17.76,
    "lon": 344.22
   },
   "member_spread_now_deg": {
    "lat": 27.75,
    "lon": 13.93
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-31",
   "flight_id": "DG2GG-31_2026-08-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 00:22:00",
   "seed_lat": 30.54167,
   "seed_lon": -132.33333,
   "seed_alt_m": 13420.0,
   "seed_age_h": 10.97,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 05:45:00",
    "lat": 30.56884,
    "lon": -41.36375,
    "alt_m": 13687.6
   },
   "member_spread_deg": {
    "lat": 27.1,
    "lon": 118.59
   },
   "member_spread_now_deg": {
    "lat": 2.61,
    "lon": 1.24
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-32",
   "flight_id": "DG2GG-32_2026-09-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 19:41:00",
   "seed_lat": 53.8125,
   "seed_lon": -132.08333,
   "seed_alt_m": 12890.0,
   "seed_age_h": 15.65,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 05:45:00",
    "lat": 75.69001,
    "lon": 32.81203,
    "alt_m": 13198.0
   },
   "member_spread_deg": {
    "lat": 27.41,
    "lon": 83.76
   },
   "member_spread_now_deg": {
    "lat": 0.63,
    "lon": 3.31
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 01:10:00",
   "seed_lat": 39.39583,
   "seed_lon": 176.41667,
   "seed_alt_m": 13410.0,
   "seed_age_h": 10.17,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 05:45:00",
    "lat": 26.61843,
    "lon": -92.58416,
    "alt_m": 13497.8
   },
   "member_spread_deg": {
    "lat": 51.23,
    "lon": 55.75
   },
   "member_spread_now_deg": {
    "lat": 0.68,
    "lon": 3.76
   },
   "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": 190.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 05:45:00",
    "lat": 3.16231,
    "lon": -24.22113,
    "alt_m": 15271.8
   },
   "member_spread_deg": {
    "lat": 49.3,
    "lon": 261.82
   },
   "member_spread_now_deg": {
    "lat": 49.37,
    "lon": 78.74
   },
   "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": 195.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 05:30:00",
    "lat": 79.50755,
    "lon": -30.13902,
    "alt_m": 13965.7
   },
   "member_spread_deg": {
    "lat": 21.02,
    "lon": 69.3
   },
   "member_spread_now_deg": {
    "lat": 9.98,
    "lon": 42.17
   },
   "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": 166.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-03 05:45:00",
    "lat": -4.77363,
    "lon": -91.99365,
    "alt_m": 14463.7
   },
   "member_spread_deg": {
    "lat": 57.43,
    "lon": 263.27
   },
   "member_spread_now_deg": {
    "lat": 38.25,
    "lon": 352.64
   },
   "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": 56.57,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-03 05:45:00",
    "lat": 61.00075,
    "lon": 6.4845,
    "alt_m": 13826.7
   },
   "member_spread_deg": {
    "lat": 27.65,
    "lon": 37.48
   },
   "member_spread_now_deg": {
    "lat": 5.59,
    "lon": 14.42
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 09:33:00",
   "seed_lat": 44.0,
   "seed_lon": -7.79167,
   "seed_alt_m": 13500.0,
   "seed_age_h": 1.78,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 09:00:00",
    "lat": 42.16535,
    "lon": 103.39661,
    "alt_m": 13184.3
   },
   "member_spread_deg": {
    "lat": 7.85,
    "lon": 87.37
   },
   "member_spread_now_deg": {
    "lat": 0.19,
    "lon": 0.67
   },
   "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": 252.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-03 05:45:00",
    "lat": 30.17882,
    "lon": 74.10044,
    "alt_m": 13636.0
   },
   "member_spread_deg": {
    "lat": 41.84,
    "lon": 231.44
   },
   "member_spread_now_deg": {
    "lat": 50.17,
    "lon": 119.22
   },
   "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": 150.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 05:30:00",
    "lat": 35.52613,
    "lon": 38.17339,
    "alt_m": 13007.7
   },
   "member_spread_deg": {
    "lat": 45.37,
    "lon": 220.01
   },
   "member_spread_now_deg": {
    "lat": 27.67,
    "lon": 82.93
   },
   "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": 310.32,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 05:30:00",
    "lat": 43.71457,
    "lon": 125.71361,
    "alt_m": 12384.2
   },
   "member_spread_deg": {
    "lat": 14.54,
    "lon": 298.38
   },
   "member_spread_now_deg": {
    "lat": 34.91,
    "lon": 183.96
   },
   "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 18:45:45",
   "seed_lat": 71.97911,
   "seed_lon": -68.08331,
   "seed_alt_m": 12900.0,
   "seed_age_h": 16.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 05:45:00",
    "lat": 81.06786,
    "lon": 77.13084,
    "alt_m": 13135.3
   },
   "member_spread_deg": {
    "lat": 24.37,
    "lon": 239.05
   },
   "member_spread_now_deg": {
    "lat": 7.64,
    "lon": 2.34
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KJ4AWK-1",
   "flight_id": "KJ4AWK-1_2026-08-22",
   "payload_type": "APRS",
   "seed_time": "2026-09-26 00:26:17",
   "seed_lat": 57.36408,
   "seed_lon": -128.04425,
   "seed_alt_m": 12328.0,
   "seed_age_h": 10.9,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 05:30:00",
    "lat": 69.36942,
    "lon": -43.15532,
    "alt_m": 12129.6
   },
   "member_spread_deg": {
    "lat": 17.95,
    "lon": 84.63
   },
   "member_spread_now_deg": {
    "lat": 0.4,
    "lon": 3.95
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
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   "flight_id": "KM6BWB-1_2026-09-21",
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  },
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   "seed_time": "2026-09-25 21:03:25",
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   "payload_type": "APRS",
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  },
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  },
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  },
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   "callsign": "SP6MPL-34",
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  },
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  },
  {
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  },
  {
   "callsign": "ZS6WBT-1",
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   "payload_type": "WSPR",
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  }
 ]
}