{
 "generated_utc": "2026-09-30T17:27:20Z",
 "gfs_cycle_utc": "2026-09-30T12:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 460.0,
  "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_20260930_12Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260930_12Z.geojson.gz"
 },
 "counts": {
  "flights": 49,
  "members": 9,
  "rows": 198420
 },
 "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": 169.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 11:45:00",
    "lat": 51.77787,
    "lon": -126.02035,
    "alt_m": 13206.9
   },
   "member_spread_deg": {
    "lat": 27.0,
    "lon": 102.46
   },
   "member_spread_now_deg": {
    "lat": 26.0,
    "lon": 91.98
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "AE4ZZ-23",
   "flight_id": "AE4ZZ-23_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 10:51:41",
   "seed_lat": 38.10414,
   "seed_lon": 57.29167,
   "seed_alt_m": 13000.0,
   "seed_age_h": 6.47,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 11:45:00",
    "lat": 50.1092,
    "lon": -118.62242,
    "alt_m": 13160.9
   },
   "member_spread_deg": {
    "lat": 26.25,
    "lon": 63.58
   },
   "member_spread_now_deg": {
    "lat": 0.67,
    "lon": 2.79
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 09:38:40",
   "seed_lat": -66.25,
   "seed_lon": 107.58334,
   "seed_alt_m": 12150.0,
   "seed_age_h": 7.69,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-07 11:45:00",
    "lat": -56.8616,
    "lon": 13.49306,
    "alt_m": 12277.6
   },
   "member_spread_deg": {
    "lat": 25.96,
    "lon": 207.29
   },
   "member_spread_now_deg": {
    "lat": 0.19,
    "lon": 3.58
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 16:59:18",
   "seed_lat": 37.16667,
   "seed_lon": -76.66667,
   "seed_alt_m": 13670.0,
   "seed_age_h": 0.35,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 17:00:00",
    "lat": 23.14838,
    "lon": -55.4948,
    "alt_m": 13786.9
   },
   "member_spread_deg": {
    "lat": 37.0,
    "lon": 131.08
   },
   "member_spread_now_deg": {
    "lat": 0.23,
    "lon": 0.12
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 16:40:18",
   "seed_lat": 30.39583,
   "seed_lon": -26.16667,
   "seed_alt_m": 13570.0,
   "seed_age_h": 0.66,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 16:15:00",
    "lat": 35.10898,
    "lon": 129.40701,
    "alt_m": 13070.0
   },
   "member_spread_deg": {
    "lat": 8.5,
    "lon": 25.08
   },
   "member_spread_now_deg": {
    "lat": 0.07,
    "lon": 0.06
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 16:37:48",
   "seed_lat": 58.58333,
   "seed_lon": -61.58333,
   "seed_alt_m": 13350.0,
   "seed_age_h": 0.7,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 16:15:00",
    "lat": 45.85169,
    "lon": 81.50632,
    "alt_m": 13582.6
   },
   "member_spread_deg": {
    "lat": 36.25,
    "lon": 339.27
   },
   "member_spread_now_deg": {
    "lat": 0.15,
    "lon": 0.41
   },
   "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": 249.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-07 11:30:00",
    "lat": 16.68007,
    "lon": 176.14789,
    "alt_m": 11523.3
   },
   "member_spread_deg": {
    "lat": 27.5,
    "lon": 350.15
   },
   "member_spread_now_deg": {
    "lat": 18.42,
    "lon": 263.45
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 14:03:54",
   "seed_lat": 25.04167,
   "seed_lon": 29.04167,
   "seed_alt_m": 12630.0,
   "seed_age_h": 3.27,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 13:30:00",
    "lat": 38.04149,
    "lon": -83.4389,
    "alt_m": 12459.6
   },
   "member_spread_deg": {
    "lat": 25.83,
    "lon": 30.46
   },
   "member_spread_now_deg": {
    "lat": 0.63,
    "lon": 0.86
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 13:40:32",
   "seed_lat": 24.96823,
   "seed_lon": 28.62083,
   "seed_alt_m": 12650.0,
   "seed_age_h": 3.66,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 13:15:00",
    "lat": 37.62283,
    "lon": -84.42649,
    "alt_m": 12475.1
   },
   "member_spread_deg": {
    "lat": 25.91,
    "lon": 28.93
   },
   "member_spread_now_deg": {
    "lat": 0.59,
    "lon": 0.78
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-30",
   "flight_id": "DG2GG-30_2026-08-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 04:01:00",
   "seed_lat": 53.64583,
   "seed_lon": 155.29167,
   "seed_alt_m": 12260.0,
   "seed_age_h": 13.32,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-07 11:30:00",
    "lat": 44.39565,
    "lon": -17.89459,
    "alt_m": 12883.1
   },
   "member_spread_deg": {
    "lat": 25.85,
    "lon": 81.44
   },
   "member_spread_now_deg": {
    "lat": 1.73,
    "lon": 8.23
   },
   "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": 51.3,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 11:30:00",
    "lat": 36.74547,
    "lon": 51.37026,
    "alt_m": 13448.0
   },
   "member_spread_deg": {
    "lat": 15.47,
    "lon": 84.45
   },
   "member_spread_now_deg": {
    "lat": 11.03,
    "lon": 21.34
   },
   "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": 26.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 11:30:00",
    "lat": 47.10042,
    "lon": 96.40032,
    "alt_m": 13133.6
   },
   "member_spread_deg": {
    "lat": 25.14,
    "lon": 296.05
   },
   "member_spread_now_deg": {
    "lat": 10.51,
    "lon": 18.79
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 16:45:00",
   "seed_lat": 42.54167,
   "seed_lon": -101.41667,
   "seed_alt_m": 13330.0,
   "seed_age_h": 0.58,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 16:15:00",
    "lat": 13.73738,
    "lon": -72.60271,
    "alt_m": 13649.7
   },
   "member_spread_deg": {
    "lat": 26.8,
    "lon": 70.02
   },
   "member_spread_now_deg": {
    "lat": 0.21,
    "lon": 0.24
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-36",
   "flight_id": "DG2GG-36_2026-09-26",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 10:35:00",
   "seed_lat": 40.9375,
   "seed_lon": 69.5,
   "seed_alt_m": 12990.0,
   "seed_age_h": 6.75,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 11:30:00",
    "lat": 39.82528,
    "lon": -84.53027,
    "alt_m": 13089.7
   },
   "member_spread_deg": {
    "lat": 29.31,
    "lon": 84.98
   },
   "member_spread_now_deg": {
    "lat": 0.78,
    "lon": 0.59
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DH1PR-578",
   "flight_id": "DH1PR-578_2026-09-27",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 15:45:46",
   "seed_lat": 36.41667,
   "seed_lon": 29.04167,
   "seed_alt_m": 11480.0,
   "seed_age_h": 1.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 15:15:00",
    "lat": 50.99708,
    "lon": -81.06644,
    "alt_m": 11246.9
   },
   "member_spread_deg": {
    "lat": 11.25,
    "lon": 20.7
   },
   "member_spread_now_deg": {
    "lat": 0.11,
    "lon": 0.28
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DH1PR-578e",
   "flight_id": "DH1PR-578e_2026-09-27",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 15:46:32",
   "seed_lat": 36.41737,
   "seed_lon": 29.04045,
   "seed_alt_m": 11480.0,
   "seed_age_h": 1.56,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 15:15:00",
    "lat": 50.99565,
    "lon": -81.06923,
    "alt_m": 11246.9
   },
   "member_spread_deg": {
    "lat": 11.31,
    "lon": 20.69
   },
   "member_spread_now_deg": {
    "lat": 0.11,
    "lon": 0.28
   },
   "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": 292.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 11:45:00",
    "lat": 9.15984,
    "lon": -50.2461,
    "alt_m": 15297.8
   },
   "member_spread_deg": {
    "lat": 45.74,
    "lon": 319.49
   },
   "member_spread_now_deg": {
    "lat": 46.94,
    "lon": 158.63
   },
   "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": 297.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 11:30:00",
    "lat": 77.02375,
    "lon": 94.73695,
    "alt_m": 13913.9
   },
   "member_spread_deg": {
    "lat": 32.22,
    "lon": 356.53
   },
   "member_spread_now_deg": {
    "lat": 32.73,
    "lon": 41.68
   },
   "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": 268.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-07 11:45:00",
    "lat": 28.19945,
    "lon": -1.79884,
    "alt_m": 14329.3
   },
   "member_spread_deg": {
    "lat": 51.89,
    "lon": 196.72
   },
   "member_spread_now_deg": {
    "lat": 59.13,
    "lon": 290.68
   },
   "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": 1.6,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 15:15:00",
    "lat": 57.51064,
    "lon": -177.29637,
    "alt_m": 13955.8
   },
   "member_spread_deg": {
    "lat": 17.37,
    "lon": 355.64
   },
   "member_spread_now_deg": {
    "lat": 1.12,
    "lon": 0.23
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 13:43:00",
   "seed_lat": 34.41667,
   "seed_lon": 25.91667,
   "seed_alt_m": 13160.0,
   "seed_age_h": 3.62,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 13:15:00",
    "lat": 47.8103,
    "lon": -100.43683,
    "alt_m": 12943.5
   },
   "member_spread_deg": {
    "lat": 24.22,
    "lon": 62.82
   },
   "member_spread_now_deg": {
    "lat": 0.19,
    "lon": 0.29
   },
   "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": 252.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 11:30:00",
    "lat": 42.24942,
    "lon": 41.67361,
    "alt_m": 12861.1
   },
   "member_spread_deg": {
    "lat": 18.7,
    "lon": 246.7
   },
   "member_spread_now_deg": {
    "lat": 13.13,
    "lon": 160.95
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 16:45:45",
   "seed_lat": 50.99995,
   "seed_lon": -11.95831,
   "seed_alt_m": 13150.0,
   "seed_age_h": 0.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 16:15:00",
    "lat": 68.26276,
    "lon": 170.30797,
    "alt_m": 12809.2
   },
   "member_spread_deg": {
    "lat": 13.12,
    "lon": 342.46
   },
   "member_spread_now_deg": {
    "lat": 0.1,
    "lon": 0.06
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KJ4AWK-1",
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   "flight_id": "ZS6WBT-1_2026-08-19",
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   "seed_age_h": 16.48,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-07 11:45:00",
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    "lon": -73.99777,
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   },
   "member_spread_deg": {
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   },
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   },
   "display_as": "track",
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  }
 ]
}