{
 "generated_utc": "2026-09-28T23:27:50Z",
 "gfs_cycle_utc": "2026-09-28T18:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 482.5,
  "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_18Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260928_18Z.geojson.gz"
 },
 "counts": {
  "flights": 47,
  "members": 9,
  "rows": 199269
 },
 "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": 127.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 17:45:00",
    "lat": 52.79915,
    "lon": -111.68292,
    "alt_m": 13110.5
   },
   "member_spread_deg": {
    "lat": 43.52,
    "lon": 81.46
   },
   "member_spread_now_deg": {
    "lat": 33.69,
    "lon": 83.27
   },
   "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": 14.13,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 17:45:00",
    "lat": 37.80215,
    "lon": -137.28903,
    "alt_m": 13334.6
   },
   "member_spread_deg": {
    "lat": 27.1,
    "lon": 34.94
   },
   "member_spread_now_deg": {
    "lat": 1.9,
    "lon": 2.12
   },
   "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": 7.52,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-05 17:45:00",
    "lat": -79.24357,
    "lon": -134.51154,
    "alt_m": 12237.8
   },
   "member_spread_deg": {
    "lat": 24.16,
    "lon": 260.4
   },
   "member_spread_now_deg": {
    "lat": 1.34,
    "lon": 3.08
   },
   "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": 7.84,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 17:30:00",
    "lat": 33.73063,
    "lon": -51.21798,
    "alt_m": 13665.0
   },
   "member_spread_deg": {
    "lat": 25.78,
    "lon": 100.63
   },
   "member_spread_now_deg": {
    "lat": 2.73,
    "lon": 1.99
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 19:36:20",
   "seed_lat": 24.1875,
   "seed_lon": -42.04167,
   "seed_alt_m": 13660.0,
   "seed_age_h": 3.73,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 19:00:00",
    "lat": 39.22774,
    "lon": 90.75944,
    "alt_m": 13391.1
   },
   "member_spread_deg": {
    "lat": 14.43,
    "lon": 67.4
   },
   "member_spread_now_deg": {
    "lat": 0.5,
    "lon": 0.41
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 22:19:48",
   "seed_lat": 57.77083,
   "seed_lon": -110.79167,
   "seed_alt_m": 13260.0,
   "seed_age_h": 1.0,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 21:45:00",
    "lat": 52.53009,
    "lon": 53.15046,
    "alt_m": 13514.0
   },
   "member_spread_deg": {
    "lat": 34.42,
    "lon": 144.22
   },
   "member_spread_now_deg": {
    "lat": 0.05,
    "lon": 0.21
   },
   "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": 207.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-05 17:30:00",
    "lat": 38.48425,
    "lon": -112.43399,
    "alt_m": 11487.0
   },
   "member_spread_deg": {
    "lat": 29.73,
    "lon": 280.91
   },
   "member_spread_now_deg": {
    "lat": 27.08,
    "lon": 283.9
   },
   "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": 6.6,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 17:45:00",
    "lat": 44.6984,
    "lon": -137.80385,
    "alt_m": 12568.3
   },
   "member_spread_deg": {
    "lat": 7.3,
    "lon": 337.58
   },
   "member_spread_now_deg": {
    "lat": 2.26,
    "lon": 1.2
   },
   "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": 6.76,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 17:30:00",
    "lat": 44.7931,
    "lon": -137.59793,
    "alt_m": 12560.4
   },
   "member_spread_deg": {
    "lat": 16.5,
    "lon": 283.13
   },
   "member_spread_now_deg": {
    "lat": 2.43,
    "lon": 1.28
   },
   "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": 19.98,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-05 17:45:00",
    "lat": 74.92326,
    "lon": -4.40026,
    "alt_m": 11990.1
   },
   "member_spread_deg": {
    "lat": 23.61,
    "lon": 86.9
   },
   "member_spread_now_deg": {
    "lat": 4.31,
    "lon": 6.31
   },
   "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": 9.3,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 17:30:00",
    "lat": 41.89622,
    "lon": 70.26612,
    "alt_m": 13278.3
   },
   "member_spread_deg": {
    "lat": 17.78,
    "lon": 121.67
   },
   "member_spread_now_deg": {
    "lat": 1.67,
    "lon": 1.3
   },
   "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": 10.23,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 17:30:00",
    "lat": 59.60299,
    "lon": 78.06627,
    "alt_m": 12863.8
   },
   "member_spread_deg": {
    "lat": 35.11,
    "lon": 94.12
   },
   "member_spread_now_deg": {
    "lat": 1.88,
    "lon": 7.0
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 22:35:00",
   "seed_lat": 32.77083,
   "seed_lon": -134.91667,
   "seed_alt_m": 13430.0,
   "seed_age_h": 0.75,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 22:00:00",
    "lat": 26.77085,
    "lon": -45.97268,
    "alt_m": 13652.1
   },
   "member_spread_deg": {
    "lat": 44.91,
    "lon": 69.05
   },
   "member_spread_now_deg": {
    "lat": 0.11,
    "lon": 0.26
   },
   "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": 10.0,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 17:45:00",
    "lat": 30.60533,
    "lon": -147.69974,
    "alt_m": 13157.8
   },
   "member_spread_deg": {
    "lat": 35.88,
    "lon": 44.12
   },
   "member_spread_now_deg": {
    "lat": 1.61,
    "lon": 5.96
   },
   "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": 6.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-05 17:45:00",
    "lat": 39.99806,
    "lon": -175.85629,
    "alt_m": 11453.7
   },
   "member_spread_deg": {
    "lat": 17.42,
    "lon": 353.67
   },
   "member_spread_now_deg": {
    "lat": 0.5,
    "lon": 1.72
   },
   "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": 6.56,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-05 17:45:00",
    "lat": 39.98924,
    "lon": -175.88417,
    "alt_m": 11453.5
   },
   "member_spread_deg": {
    "lat": 17.43,
    "lon": 353.77
   },
   "member_spread_now_deg": {
    "lat": 0.5,
    "lon": 1.71
   },
   "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": 250.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 17:45:00",
    "lat": 2.76826,
    "lon": -50.36086,
    "alt_m": 15358.0
   },
   "member_spread_deg": {
    "lat": 65.14,
    "lon": 293.41
   },
   "member_spread_now_deg": {
    "lat": 49.87,
    "lon": 119.79
   },
   "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": 255.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 17:30:00",
    "lat": 77.40032,
    "lon": 56.32719,
    "alt_m": 13893.7
   },
   "member_spread_deg": {
    "lat": 23.8,
    "lon": 96.86
   },
   "member_spread_now_deg": {
    "lat": 14.89,
    "lon": 84.27
   },
   "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": 226.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-05 17:45:00",
    "lat": 6.55333,
    "lon": -66.61469,
    "alt_m": 14439.1
   },
   "member_spread_deg": {
    "lat": 46.21,
    "lon": 241.99
   },
   "member_spread_now_deg": {
    "lat": 56.79,
    "lon": 323.99
   },
   "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": 51.64,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 17:45:00",
    "lat": 46.98159,
    "lon": 60.23808,
    "alt_m": 14144.9
   },
   "member_spread_deg": {
    "lat": 35.5,
    "lon": 107.04
   },
   "member_spread_now_deg": {
    "lat": 22.57,
    "lon": 44.64
   },
   "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": 8.78,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 17:30:00",
    "lat": 46.50024,
    "lon": 169.91379,
    "alt_m": 12973.0
   },
   "member_spread_deg": {
    "lat": 7.63,
    "lon": 354.84
   },
   "member_spread_now_deg": {
    "lat": 1.0,
    "lon": 0.55
   },
   "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": 312.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-05 17:45:00",
    "lat": 45.49538,
    "lon": -131.38865,
    "alt_m": 13403.7
   },
   "member_spread_deg": {
    "lat": 55.36,
    "lon": 252.66
   },
   "member_spread_now_deg": {
    "lat": 30.36,
    "lon": 195.19
   },
   "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": 210.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 17:30:00",
    "lat": 36.73617,
    "lon": 25.6843,
    "alt_m": 13045.6
   },
   "member_spread_deg": {
    "lat": 28.87,
    "lon": 279.46
   },
   "member_spread_now_deg": {
    "lat": 24.73,
    "lon": 165.55
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
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  },
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  },
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  },
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  {
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  }
 ]
}