{
 "generated_utc": "2026-10-01T17:28:00Z",
 "gfs_cycle_utc": "2026-10-01T12:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 484.0,
  "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_12Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20261001_12Z.geojson.gz"
 },
 "counts": {
  "flights": 52,
  "members": 9,
  "rows": 209712
 },
 "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": 193.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 11:45:00",
    "lat": 27.97479,
    "lon": -101.83727,
    "alt_m": 13469.2
   },
   "member_spread_deg": {
    "lat": 47.46,
    "lon": 149.79
   },
   "member_spread_now_deg": {
    "lat": 14.63,
    "lon": 92.8
   },
   "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": 8.06,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 11:45:00",
    "lat": 62.38767,
    "lon": -17.25875,
    "alt_m": 12780.2
   },
   "member_spread_deg": {
    "lat": 33.36,
    "lon": 109.14
   },
   "member_spread_now_deg": {
    "lat": 0.78,
    "lon": 2.57
   },
   "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": 9.11,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-08 11:45:00",
    "lat": -47.08587,
    "lon": 122.95354,
    "alt_m": 12219.9
   },
   "member_spread_deg": {
    "lat": 20.16,
    "lon": 242.85
   },
   "member_spread_now_deg": {
    "lat": 0.4,
    "lon": 4.66
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 16:51:18",
   "seed_lat": 31.4375,
   "seed_lon": -68.0,
   "seed_alt_m": 13740.0,
   "seed_age_h": 0.48,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 16:15:00",
    "lat": 25.67188,
    "lon": 22.25479,
    "alt_m": 13758.1
   },
   "member_spread_deg": {
    "lat": 26.54,
    "lon": 107.2
   },
   "member_spread_now_deg": {
    "lat": 0.1,
    "lon": 0.28
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 16:28:19",
   "seed_lat": 29.41667,
   "seed_lon": -10.95833,
   "seed_alt_m": 13570.0,
   "seed_age_h": 0.86,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 16:00:00",
    "lat": 50.26876,
    "lon": 178.4052,
    "alt_m": 12772.8
   },
   "member_spread_deg": {
    "lat": 15.34,
    "lon": 354.56
   },
   "member_spread_now_deg": {
    "lat": 0.14,
    "lon": 0.17
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 16:57:19",
   "seed_lat": 50.9375,
   "seed_lon": -32.125,
   "seed_alt_m": 13510.0,
   "seed_age_h": 0.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 17:00:00",
    "lat": 48.08942,
    "lon": 135.6169,
    "alt_m": 13497.2
   },
   "member_spread_deg": {
    "lat": 30.09,
    "lon": 183.56
   },
   "member_spread_now_deg": {
    "lat": 0.08,
    "lon": 0.33
   },
   "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": 273.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 11:30:00",
    "lat": 21.50496,
    "lon": 162.11376,
    "alt_m": 11534.8
   },
   "member_spread_deg": {
    "lat": 23.73,
    "lon": 334.44
   },
   "member_spread_now_deg": {
    "lat": 42.84,
    "lon": 326.28
   },
   "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": 6.08,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 11:45:00",
    "lat": 41.75624,
    "lon": -69.33627,
    "alt_m": 12306.8
   },
   "member_spread_deg": {
    "lat": 7.3,
    "lon": 53.5
   },
   "member_spread_now_deg": {
    "lat": 0.24,
    "lon": 3.13
   },
   "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": 6.91,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 11:30:00",
    "lat": 41.66728,
    "lon": -70.01556,
    "alt_m": 12307.1
   },
   "member_spread_deg": {
    "lat": 11.45,
    "lon": 53.02
   },
   "member_spread_now_deg": {
    "lat": 0.27,
    "lon": 3.65
   },
   "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": 17.07,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-08 11:45:00",
    "lat": 32.23101,
    "lon": -17.66554,
    "alt_m": 12856.8
   },
   "member_spread_deg": {
    "lat": 30.21,
    "lon": 126.06
   },
   "member_spread_now_deg": {
    "lat": 1.81,
    "lon": 356.46
   },
   "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": 75.3,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 11:30:00",
    "lat": 30.45657,
    "lon": 30.3436,
    "alt_m": 13462.8
   },
   "member_spread_deg": {
    "lat": 13.49,
    "lon": 97.37
   },
   "member_spread_now_deg": {
    "lat": 15.98,
    "lon": 36.25
   },
   "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": 50.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 11:30:00",
    "lat": 49.07857,
    "lon": -149.48258,
    "alt_m": 12891.3
   },
   "member_spread_deg": {
    "lat": 37.73,
    "lon": 341.94
   },
   "member_spread_now_deg": {
    "lat": 22.68,
    "lon": 14.63
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 16:45:00",
   "seed_lat": 30.20833,
   "seed_lon": -84.66667,
   "seed_alt_m": 13600.0,
   "seed_age_h": 0.58,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 16:15:00",
    "lat": 1.89351,
    "lon": -139.2399,
    "alt_m": 13786.0
   },
   "member_spread_deg": {
    "lat": 44.05,
    "lon": 147.26
   },
   "member_spread_now_deg": {
    "lat": 0.08,
    "lon": 0.11
   },
   "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": 10.67,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 11:45:00",
    "lat": 40.8713,
    "lon": -48.64356,
    "alt_m": 13181.0
   },
   "member_spread_deg": {
    "lat": 23.9,
    "lon": 66.95
   },
   "member_spread_now_deg": {
    "lat": 1.51,
    "lon": 2.46
   },
   "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": 7.23,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-08 11:30:00",
    "lat": 48.01336,
    "lon": -66.18637,
    "alt_m": 11117.1
   },
   "member_spread_deg": {
    "lat": 17.15,
    "lon": 18.82
   },
   "member_spread_now_deg": {
    "lat": 2.02,
    "lon": 1.83
   },
   "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": 7.21,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-08 11:45:00",
    "lat": 47.84363,
    "lon": -64.7027,
    "alt_m": 11110.1
   },
   "member_spread_deg": {
    "lat": 15.96,
    "lon": 19.21
   },
   "member_spread_now_deg": {
    "lat": 2.02,
    "lon": 1.88
   },
   "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": 6.02,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 11:45:00",
    "lat": 44.80565,
    "lon": -94.86304,
    "alt_m": 12328.6
   },
   "member_spread_deg": {
    "lat": 18.06,
    "lon": 44.11
   },
   "member_spread_now_deg": {
    "lat": 0.75,
    "lon": 0.53
   },
   "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": 316.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 11:45:00",
    "lat": 3.3368,
    "lon": -20.19938,
    "alt_m": 15330.7
   },
   "member_spread_deg": {
    "lat": 67.66,
    "lon": 262.63
   },
   "member_spread_now_deg": {
    "lat": 47.8,
    "lon": 221.22
   },
   "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": 321.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 11:30:00",
    "lat": 75.7955,
    "lon": 101.65308,
    "alt_m": 14081.6
   },
   "member_spread_deg": {
    "lat": 33.07,
    "lon": 287.63
   },
   "member_spread_now_deg": {
    "lat": 31.53,
    "lon": 45.55
   },
   "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": 292.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-08 11:45:00",
    "lat": 24.01911,
    "lon": 2.16276,
    "alt_m": 14405.9
   },
   "member_spread_deg": {
    "lat": 34.99,
    "lon": 355.58
   },
   "member_spread_now_deg": {
    "lat": 56.22,
    "lon": 274.52
   },
   "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": 25.6,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 11:45:00",
    "lat": 38.03967,
    "lon": -161.33733,
    "alt_m": 14638.4
   },
   "member_spread_deg": {
    "lat": 34.76,
    "lon": 344.08
   },
   "member_spread_now_deg": {
    "lat": 6.37,
    "lon": 35.9
   },
   "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": 3.95,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 13:00:00",
    "lat": 54.24727,
    "lon": -71.96963,
    "alt_m": 12710.1
   },
   "member_spread_deg": {
    "lat": 16.46,
    "lon": 44.99
   },
   "member_spread_now_deg": {
    "lat": 0.79,
    "lon": 0.57
   },
   "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": 276.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 11:30:00",
    "lat": 39.79937,
    "lon": 65.04064,
    "alt_m": 13061.8
   },
   "member_spread_deg": {
    "lat": 22.53,
    "lon": 353.25
   },
   "member_spread_now_deg": {
    "lat": 36.03,
    "lon": 133.34
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KI6DS-11",
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  },
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   "flight_id": "WD4CFN-21_2026-09-13",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 07:00:38",
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  },
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   "seed_time": "2026-10-01 15:36:00",
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   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "ZL2P-1",
   "flight_id": "ZL2P-1_2026-09-28",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 16:15:00",
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   "seed_lon": -31.25,
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   "nominal_end": {
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   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "ZS6WBT-1",
   "flight_id": "ZS6WBT-1_2026-08-19",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 01:26:00",
   "seed_lat": -15.16667,
   "seed_lon": -144.5,
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   "float_reliable": true,
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   "nominal_end": {
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   "member_spread_now_deg": {
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   },
   "display_as": "track",
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  }
 ]
}