{
 "generated_utc": "2026-10-01T11:27:51Z",
 "gfs_cycle_utc": "2026-10-01T06:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 478.0,
  "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_06Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20261001_06Z.geojson.gz"
 },
 "counts": {
  "flights": 51,
  "members": 9,
  "rows": 208482
 },
 "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": 187.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 05:45:00",
    "lat": 39.01848,
    "lon": -109.90711,
    "alt_m": 13448.7
   },
   "member_spread_deg": {
    "lat": 48.1,
    "lon": 127.68
   },
   "member_spread_now_deg": {
    "lat": 16.24,
    "lon": 92.68
   },
   "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": 2.06,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 08:45:00",
    "lat": 43.57342,
    "lon": -39.06467,
    "alt_m": 13320.8
   },
   "member_spread_deg": {
    "lat": 13.49,
    "lon": 69.7
   },
   "member_spread_now_deg": {
    "lat": 0.13,
    "lon": 0.24
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 08:13:40",
   "seed_lat": -64.45833,
   "seed_lon": 145.41668,
   "seed_alt_m": 12150.0,
   "seed_age_h": 3.11,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-08 07:45:00",
    "lat": -53.21362,
    "lon": 126.88442,
    "alt_m": 12273.7
   },
   "member_spread_deg": {
    "lat": 18.36,
    "lon": 105.44
   },
   "member_spread_now_deg": {
    "lat": 0.13,
    "lon": 1.37
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 20:22:48",
   "seed_lat": 36.1875,
   "seed_lon": -75.95833,
   "seed_alt_m": 13644.0,
   "seed_age_h": 14.95,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 05:30:00",
    "lat": 25.29135,
    "lon": -20.21718,
    "alt_m": 13747.6
   },
   "member_spread_deg": {
    "lat": 14.81,
    "lon": 75.68
   },
   "member_spread_now_deg": {
    "lat": 1.78,
    "lon": 7.04
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 10:57:19",
   "seed_lat": 29.85417,
   "seed_lon": -13.16667,
   "seed_alt_m": 13560.0,
   "seed_age_h": 0.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 11:00:00",
    "lat": 42.98137,
    "lon": -166.34018,
    "alt_m": 13069.4
   },
   "member_spread_deg": {
    "lat": 12.7,
    "lon": 338.68
   },
   "member_spread_now_deg": {
    "lat": 0.08,
    "lon": 0.08
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 10:50:48",
   "seed_lat": 52.375,
   "seed_lon": -40.375,
   "seed_alt_m": 13440.0,
   "seed_age_h": 0.49,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 10:15:00",
    "lat": 47.26959,
    "lon": 112.36011,
    "alt_m": 13552.6
   },
   "member_spread_deg": {
    "lat": 26.14,
    "lon": 326.4
   },
   "member_spread_now_deg": {
    "lat": 0.14,
    "lon": 0.35
   },
   "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": 267.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-08 05:30:00",
    "lat": 14.33945,
    "lon": -173.94765,
    "alt_m": 11537.5
   },
   "member_spread_deg": {
    "lat": 29.72,
    "lon": 283.01
   },
   "member_spread_now_deg": {
    "lat": 34.91,
    "lon": 309.86
   },
   "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 10:24:46",
   "seed_lat": 33.66667,
   "seed_lon": 50.66667,
   "seed_alt_m": 12530.0,
   "seed_age_h": 0.92,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 10:00:00",
    "lat": 41.61658,
    "lon": -67.11321,
    "alt_m": 12325.2
   },
   "member_spread_deg": {
    "lat": 13.19,
    "lon": 58.96
   },
   "member_spread_now_deg": {
    "lat": 0.1,
    "lon": 0.58
   },
   "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": 0.91,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 10:00:00",
    "lat": 41.52237,
    "lon": -67.76124,
    "alt_m": 12319.8
   },
   "member_spread_deg": {
    "lat": 12.89,
    "lon": 59.16
   },
   "member_spread_now_deg": {
    "lat": 0.1,
    "lon": 0.58
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-30",
   "flight_id": "DG2GG-30_2026-08-07",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 00:16:00",
   "seed_lat": 54.20833,
   "seed_lon": 172.41667,
   "seed_alt_m": 12150.0,
   "seed_age_h": 11.07,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-08 05:45:00",
    "lat": 39.10768,
    "lon": -19.40576,
    "alt_m": 12882.7
   },
   "member_spread_deg": {
    "lat": 38.93,
    "lon": 96.12
   },
   "member_spread_now_deg": {
    "lat": 1.2,
    "lon": 358.97
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "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": 69.3,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 05:30:00",
    "lat": 28.75316,
    "lon": 33.48064,
    "alt_m": 13474.6
   },
   "member_spread_deg": {
    "lat": 13.78,
    "lon": 92.09
   },
   "member_spread_now_deg": {
    "lat": 12.82,
    "lon": 34.87
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 44.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 05:30:00",
    "lat": 42.02204,
    "lon": -161.31526,
    "alt_m": 13268.3
   },
   "member_spread_deg": {
    "lat": 40.14,
    "lon": 333.82
   },
   "member_spread_now_deg": {
    "lat": 20.33,
    "lon": 11.0
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 20:10:00",
   "seed_lat": 44.35417,
   "seed_lon": -95.0,
   "seed_alt_m": 13420.0,
   "seed_age_h": 15.17,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 05:45:00",
    "lat": 23.32844,
    "lon": 5.81923,
    "alt_m": 13663.3
   },
   "member_spread_deg": {
    "lat": 23.15,
    "lon": 94.07
   },
   "member_spread_now_deg": {
    "lat": 3.85,
    "lon": 6.33
   },
   "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": 4.67,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 06:15:00",
    "lat": 40.72695,
    "lon": -59.67451,
    "alt_m": 13167.6
   },
   "member_spread_deg": {
    "lat": 18.3,
    "lon": 80.32
   },
   "member_spread_now_deg": {
    "lat": 0.25,
    "lon": 1.19
   },
   "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": 1.23,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-08 09:30:00",
    "lat": 44.75084,
    "lon": -54.53075,
    "alt_m": 10959.8
   },
   "member_spread_deg": {
    "lat": 7.34,
    "lon": 26.66
   },
   "member_spread_now_deg": {
    "lat": 0.17,
    "lon": 0.18
   },
   "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": 1.21,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-08 09:45:00",
    "lat": 44.63415,
    "lon": -54.4447,
    "alt_m": 10964.8
   },
   "member_spread_deg": {
    "lat": 6.99,
    "lon": 26.95
   },
   "member_spread_now_deg": {
    "lat": 0.17,
    "lon": 0.18
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DJ2DS-35",
   "flight_id": "DJ2DS-35_2026-10-01",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 10:39:00",
   "seed_lat": 55.27083,
   "seed_lon": 76.83333,
   "seed_alt_m": 12520.0,
   "seed_age_h": 0.68,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 10:15:00",
    "lat": 53.38051,
    "lon": -103.31728,
    "alt_m": 12292.8
   },
   "member_spread_deg": {
    "lat": 12.73,
    "lon": 40.44
   },
   "member_spread_now_deg": {
    "lat": 0.08,
    "lon": 0.12
   },
   "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": 310.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 05:45:00",
    "lat": 4.68001,
    "lon": -18.79628,
    "alt_m": 15311.3
   },
   "member_spread_deg": {
    "lat": 56.92,
    "lon": 249.84
   },
   "member_spread_now_deg": {
    "lat": 47.39,
    "lon": 204.88
   },
   "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": 315.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 05:30:00",
    "lat": 79.94345,
    "lon": 91.69945,
    "alt_m": 14070.0
   },
   "member_spread_deg": {
    "lat": 37.19,
    "lon": 278.85
   },
   "member_spread_now_deg": {
    "lat": 31.42,
    "lon": 50.67
   },
   "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": 286.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-08 05:45:00",
    "lat": 22.24845,
    "lon": 22.44526,
    "alt_m": 14245.0
   },
   "member_spread_deg": {
    "lat": 55.67,
    "lon": 346.73
   },
   "member_spread_now_deg": {
    "lat": 56.64,
    "lon": 277.74
   },
   "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": 19.6,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 05:45:00",
    "lat": 54.55701,
    "lon": -162.68436,
    "alt_m": 13761.6
   },
   "member_spread_deg": {
    "lat": 19.72,
    "lon": 356.34
   },
   "member_spread_now_deg": {
    "lat": 9.85,
    "lon": 16.08
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 10:18:00",
   "seed_lat": 38.60417,
   "seed_lon": 36.29167,
   "seed_alt_m": 13140.0,
   "seed_age_h": 1.03,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 09:45:00",
    "lat": 50.5415,
    "lon": -70.11255,
    "alt_m": 12871.6
   },
   "member_spread_deg": {
    "lat": 14.67,
    "lon": 49.57
   },
   "member_spread_now_deg": {
    "lat": 0.11,
    "lon": 0.17
   },
   "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": 270.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 05:30:00",
    "lat": 42.38736,
    "lon": 78.39089,
    "alt_m": 12962.7
   },
   "member_spread_deg": {
    "lat": 21.96,
    "lon": 325.42
   },
   "member_spread_now_deg": {
    "lat": 32.31,
    "lon": 139.25
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KI6DS-11",
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  },
  {
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   "seed_time": "2026-09-30 19:30:00",
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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 01:26:00",
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   "seed_lon": -144.5,
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   "display_as": "track",
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  }
 ]
}