{
 "generated_utc": "2026-10-01T23:27:54Z",
 "gfs_cycle_utc": "2026-10-01T18:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 490.0,
  "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_20261001_18Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20261001_18Z.geojson.gz"
 },
 "counts": {
  "flights": 52,
  "members": 9,
  "rows": 212886
 },
 "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": 199.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 17:45:00",
    "lat": 37.3093,
    "lon": -47.22585,
    "alt_m": 13654.5
   },
   "member_spread_deg": {
    "lat": 41.9,
    "lon": 140.92
   },
   "member_spread_now_deg": {
    "lat": 13.9,
    "lon": 320.55
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "AE4ZZ-23",
   "flight_id": "AE4ZZ-23_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 09:16:41",
   "seed_lat": 40.04164,
   "seed_lon": 79.49999,
   "seed_alt_m": 13060.0,
   "seed_age_h": 14.06,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 17:45:00",
    "lat": 38.43245,
    "lon": -55.72472,
    "alt_m": 13377.3
   },
   "member_spread_deg": {
    "lat": 25.89,
    "lon": 91.69
   },
   "member_spread_now_deg": {
    "lat": 1.12,
    "lon": 5.47
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 22:43:40",
   "seed_lat": -65.91666,
   "seed_lon": 175.25001,
   "seed_alt_m": 12120.0,
   "seed_age_h": 0.61,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-08 22:45:00",
    "lat": -64.26828,
    "lon": 73.59909,
    "alt_m": 12207.5
   },
   "member_spread_deg": {
    "lat": 23.78,
    "lon": 326.35
   },
   "member_spread_now_deg": {
    "lat": 0.04,
    "lon": 0.23
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 20:48:18",
   "seed_lat": 31.16667,
   "seed_lon": -66.0,
   "seed_alt_m": 13670.0,
   "seed_age_h": 2.53,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 20:15:00",
    "lat": 20.69554,
    "lon": 26.12438,
    "alt_m": 13902.5
   },
   "member_spread_deg": {
    "lat": 19.28,
    "lon": 109.32
   },
   "member_spread_now_deg": {
    "lat": 0.84,
    "lon": 0.84
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 17:15:18",
   "seed_lat": 29.4375,
   "seed_lon": -10.58333,
   "seed_alt_m": 13550.0,
   "seed_age_h": 6.08,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 17:45:00",
    "lat": 51.06322,
    "lon": -158.46403,
    "alt_m": 12856.7
   },
   "member_spread_deg": {
    "lat": 22.2,
    "lon": 346.79
   },
   "member_spread_now_deg": {
    "lat": 0.7,
    "lon": 0.59
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 18:42:48",
   "seed_lat": 50.3125,
   "seed_lon": -29.79167,
   "seed_alt_m": 13540.0,
   "seed_age_h": 4.62,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 18:15:00",
    "lat": 48.89144,
    "lon": 35.53938,
    "alt_m": 13918.5
   },
   "member_spread_deg": {
    "lat": 30.1,
    "lon": 298.04
   },
   "member_spread_now_deg": {
    "lat": 0.15,
    "lon": 3.24
   },
   "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": 279.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 17:30:00",
    "lat": 21.90844,
    "lon": 154.33424,
    "alt_m": 11514.1
   },
   "member_spread_deg": {
    "lat": 47.63,
    "lon": 320.72
   },
   "member_spread_now_deg": {
    "lat": 49.02,
    "lon": 345.67
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 11:15:01",
   "seed_lat": 33.79167,
   "seed_lon": 51.75,
   "seed_alt_m": 12520.0,
   "seed_age_h": 12.08,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 17:45:00",
    "lat": 41.62644,
    "lon": -58.1086,
    "alt_m": 12451.8
   },
   "member_spread_deg": {
    "lat": 35.88,
    "lon": 91.56
   },
   "member_spread_now_deg": {
    "lat": 1.6,
    "lon": 4.68
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 10:25:32",
   "seed_lat": 33.68186,
   "seed_lon": 50.67882,
   "seed_alt_m": 12530.0,
   "seed_age_h": 12.91,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 17:30:00",
    "lat": 41.63014,
    "lon": -50.5037,
    "alt_m": 12413.5
   },
   "member_spread_deg": {
    "lat": 32.68,
    "lon": 90.47
   },
   "member_spread_now_deg": {
    "lat": 1.54,
    "lon": 5.27
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-30",
   "flight_id": "DG2GG-30_2026-08-07",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 21:46:00",
   "seed_lat": 55.22917,
   "seed_lon": -171.33333,
   "seed_alt_m": 12210.0,
   "seed_age_h": 1.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-08 21:15:00",
    "lat": 56.59637,
    "lon": 50.89721,
    "alt_m": 12195.2
   },
   "member_spread_deg": {
    "lat": 23.06,
    "lon": 106.55
   },
   "member_spread_now_deg": {
    "lat": 0.17,
    "lon": 0.84
   },
   "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": 81.3,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 17:30:00",
    "lat": 33.06854,
    "lon": 40.14482,
    "alt_m": 13534.0
   },
   "member_spread_deg": {
    "lat": 18.03,
    "lon": 117.47
   },
   "member_spread_now_deg": {
    "lat": 21.21,
    "lon": 39.66
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "DG2GG-32",
   "flight_id": "DG2GG-32_2026-09-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 14:26:00",
   "seed_lat": 56.64583,
   "seed_lon": -16.75,
   "seed_alt_m": 13030.0,
   "seed_age_h": 56.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 17:30:00",
    "lat": 39.11904,
    "lon": -150.49857,
    "alt_m": 13272.9
   },
   "member_spread_deg": {
    "lat": 35.02,
    "lon": 337.54
   },
   "member_spread_now_deg": {
    "lat": 27.71,
    "lon": 15.96
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 20:45:00",
   "seed_lat": 28.14583,
   "seed_lon": -87.08333,
   "seed_alt_m": 13560.0,
   "seed_age_h": 2.58,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 20:15:00",
    "lat": 16.94505,
    "lon": -77.31494,
    "alt_m": 13711.9
   },
   "member_spread_deg": {
    "lat": 29.16,
    "lon": 137.97
   },
   "member_spread_now_deg": {
    "lat": 0.8,
    "lon": 0.79
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-36",
   "flight_id": "DG2GG-36_2026-09-26",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 06:40:00",
   "seed_lat": 43.6875,
   "seed_lon": 93.66667,
   "seed_alt_m": 12980.0,
   "seed_age_h": 16.67,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 17:45:00",
    "lat": 40.40895,
    "lon": -44.78304,
    "alt_m": 13343.8
   },
   "member_spread_deg": {
    "lat": 28.99,
    "lon": 98.25
   },
   "member_spread_now_deg": {
    "lat": 1.71,
    "lon": 3.74
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DH1PR-578",
   "flight_id": "DH1PR-578_2026-09-27",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 10:06:01",
   "seed_lat": 41.6875,
   "seed_lon": 36.625,
   "seed_alt_m": 11000.0,
   "seed_age_h": 13.23,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-08 17:30:00",
    "lat": 28.10779,
    "lon": -101.03436,
    "alt_m": 11015.6
   },
   "member_spread_deg": {
    "lat": 22.9,
    "lon": 64.25
   },
   "member_spread_now_deg": {
    "lat": 2.96,
    "lon": 4.48
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DH1PR-578e",
   "flight_id": "DH1PR-578e_2026-09-27",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 10:07:31",
   "seed_lat": 41.69558,
   "seed_lon": 36.63767,
   "seed_alt_m": 11000.0,
   "seed_age_h": 13.21,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-08 17:45:00",
    "lat": 28.19601,
    "lon": -100.77293,
    "alt_m": 11023.9
   },
   "member_spread_deg": {
    "lat": 27.75,
    "lon": 65.39
   },
   "member_spread_now_deg": {
    "lat": 3.01,
    "lon": 4.6
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DJ2DS-35",
   "flight_id": "DJ2DS-35_2026-10-01",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 11:19:00",
   "seed_lat": 55.22917,
   "seed_lon": 77.08333,
   "seed_alt_m": 12510.0,
   "seed_age_h": 12.02,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 17:45:00",
    "lat": 48.86816,
    "lon": -102.68275,
    "alt_m": 12443.4
   },
   "member_spread_deg": {
    "lat": 18.52,
    "lon": 26.49
   },
   "member_spread_now_deg": {
    "lat": 1.31,
    "lon": 0.4
   },
   "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": 322.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 17:45:00",
    "lat": 2.51427,
    "lon": -19.56673,
    "alt_m": 15282.3
   },
   "member_spread_deg": {
    "lat": 67.88,
    "lon": 267.6
   },
   "member_spread_now_deg": {
    "lat": 47.98,
    "lon": 268.16
   },
   "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": 327.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 17:30:00",
    "lat": 69.97753,
    "lon": 100.42638,
    "alt_m": 14025.9
   },
   "member_spread_deg": {
    "lat": 30.59,
    "lon": 295.4
   },
   "member_spread_now_deg": {
    "lat": 31.41,
    "lon": 47.78
   },
   "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": 298.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-08 17:45:00",
    "lat": 18.93272,
    "lon": -22.0026,
    "alt_m": 14441.2
   },
   "member_spread_deg": {
    "lat": 46.27,
    "lon": 195.57
   },
   "member_spread_now_deg": {
    "lat": 55.72,
    "lon": 271.18
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DO3GU-8",
   "flight_id": "DO3GU-8_2026-08-12",
   "payload_type": "APRS",
   "seed_time": "2026-09-30 15:43:46",
   "seed_lat": 54.64466,
   "seed_lon": -1.98475,
   "seed_alt_m": 14350.0,
   "seed_age_h": 31.6,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 17:45:00",
    "lat": 55.24535,
    "lon": -152.84221,
    "alt_m": 13855.1
   },
   "member_spread_deg": {
    "lat": 38.16,
    "lon": 348.72
   },
   "member_spread_now_deg": {
    "lat": 14.68,
    "lon": 30.05
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 13:23:00",
   "seed_lat": 39.60417,
   "seed_lon": 37.95833,
   "seed_alt_m": 13070.0,
   "seed_age_h": 9.95,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 17:30:00",
    "lat": 52.02573,
    "lon": -59.19263,
    "alt_m": 12734.5
   },
   "member_spread_deg": {
    "lat": 18.84,
    "lon": 45.19
   },
   "member_spread_now_deg": {
    "lat": 1.75,
    "lon": 1.98
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 282.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 17:30:00",
    "lat": 46.95921,
    "lon": 48.59783,
    "alt_m": 13031.6
   },
   "member_spread_deg": {
    "lat": 29.47,
    "lon": 318.62
   },
   "member_spread_now_deg": {
    "lat": 38.05,
    "lon": 119.66
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KI6DS-11",
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   "display_as": "track",
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  },
  {
   "callsign": "ZL2P-1",
   "flight_id": "ZL2P-1_2026-09-28",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 18:10:00",
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   "display_as": "track",
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  },
  {
   "callsign": "ZS6WBT-1",
   "flight_id": "ZS6WBT-1_2026-08-19",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 20:41:00",
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   "seed_lon": -134.625,
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   "display_as": "track",
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  }
 ]
}