{
 "generated_utc": "2026-10-02T05:27:36Z",
 "gfs_cycle_utc": "2026-10-02T00:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 496.0,
  "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_20261002_00Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20261002_00Z.geojson.gz"
 },
 "counts": {
  "flights": 52,
  "members": 9,
  "rows": 215565
 },
 "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": 205.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 23:45:00",
    "lat": 47.72537,
    "lon": -2.15992,
    "alt_m": 13393.2
   },
   "member_spread_deg": {
    "lat": 39.05,
    "lon": 143.67
   },
   "member_spread_now_deg": {
    "lat": 14.03,
    "lon": 333.97
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "AE4ZZ-23",
   "flight_id": "AE4ZZ-23_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-10-02 05:01:41",
   "seed_lat": 40.2083,
   "seed_lon": 110.79166,
   "seed_alt_m": 12990.0,
   "seed_age_h": 0.31,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-09 05:00:00",
    "lat": 41.49808,
    "lon": -5.95602,
    "alt_m": 13299.8
   },
   "member_spread_deg": {
    "lat": 16.5,
    "lon": 48.65
   },
   "member_spread_now_deg": {
    "lat": 0.03,
    "lon": 0.16
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-10-02 04:43:40",
   "seed_lat": -66.22916,
   "seed_lon": -172.08332,
   "seed_alt_m": 12090.0,
   "seed_age_h": 0.61,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-09 04:15:00",
    "lat": -64.06957,
    "lon": 89.91643,
    "alt_m": 12082.2
   },
   "member_spread_deg": {
    "lat": 13.47,
    "lon": 321.51
   },
   "member_spread_now_deg": {
    "lat": 0.02,
    "lon": 0.38
   },
   "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": 8.53,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 23:45:00",
    "lat": 25.91354,
    "lon": 26.93847,
    "alt_m": 13759.8
   },
   "member_spread_deg": {
    "lat": 17.64,
    "lon": 107.0
   },
   "member_spread_now_deg": {
    "lat": 2.43,
    "lon": 1.68
   },
   "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": 12.08,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 23:45:00",
    "lat": 53.80644,
    "lon": -149.2173,
    "alt_m": 12602.8
   },
   "member_spread_deg": {
    "lat": 25.4,
    "lon": 351.99
   },
   "member_spread_now_deg": {
    "lat": 1.72,
    "lon": 1.13
   },
   "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": 10.62,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 23:45:00",
    "lat": 42.57934,
    "lon": 27.32963,
    "alt_m": 13790.4
   },
   "member_spread_deg": {
    "lat": 32.76,
    "lon": 171.78
   },
   "member_spread_now_deg": {
    "lat": 1.04,
    "lon": 6.97
   },
   "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": 285.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 23:30:00",
    "lat": 24.28661,
    "lon": -154.10322,
    "alt_m": 11589.8
   },
   "member_spread_deg": {
    "lat": 25.0,
    "lon": 299.5
   },
   "member_spread_now_deg": {
    "lat": 56.53,
    "lon": 184.54
   },
   "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": 18.08,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 23:45:00",
    "lat": 46.77379,
    "lon": 7.52934,
    "alt_m": 12336.6
   },
   "member_spread_deg": {
    "lat": 33.28,
    "lon": 111.88
   },
   "member_spread_now_deg": {
    "lat": 2.58,
    "lon": 8.08
   },
   "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": 18.91,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 23:30:00",
    "lat": 46.83361,
    "lon": 8.33818,
    "alt_m": 12325.7
   },
   "member_spread_deg": {
    "lat": 31.03,
    "lon": 112.59
   },
   "member_spread_now_deg": {
    "lat": 2.48,
    "lon": 8.69
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-30",
   "flight_id": "DG2GG-30_2026-08-07",
   "payload_type": "WSPR",
   "seed_time": "2026-10-02 02:26:00",
   "seed_lat": 55.0625,
   "seed_lon": -167.29167,
   "seed_alt_m": 12220.0,
   "seed_age_h": 2.9,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-09 02:00:00",
    "lat": 59.94112,
    "lon": 55.45609,
    "alt_m": 12116.9
   },
   "member_spread_deg": {
    "lat": 7.93,
    "lon": 76.71
   },
   "member_spread_now_deg": {
    "lat": 0.24,
    "lon": 1.06
   },
   "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": 87.3,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 23:30:00",
    "lat": 33.57857,
    "lon": 74.2843,
    "alt_m": 13372.9
   },
   "member_spread_deg": {
    "lat": 20.19,
    "lon": 198.05
   },
   "member_spread_now_deg": {
    "lat": 24.66,
    "lon": 39.95
   },
   "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": 62.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 23:30:00",
    "lat": 51.62401,
    "lon": -135.24274,
    "alt_m": 12731.3
   },
   "member_spread_deg": {
    "lat": 30.87,
    "lon": 318.92
   },
   "member_spread_now_deg": {
    "lat": 35.24,
    "lon": 14.02
   },
   "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": 8.58,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 23:45:00",
    "lat": 29.3168,
    "lon": -64.53913,
    "alt_m": 13778.9
   },
   "member_spread_deg": {
    "lat": 36.27,
    "lon": 155.15
   },
   "member_spread_now_deg": {
    "lat": 3.96,
    "lon": 5.39
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-36",
   "flight_id": "DG2GG-36_2026-09-26",
   "payload_type": "WSPR",
   "seed_time": "2026-10-02 00:50:00",
   "seed_lat": 41.4375,
   "seed_lon": 127.125,
   "seed_alt_m": 12810.0,
   "seed_age_h": 4.5,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-09 00:15:00",
    "lat": 30.02968,
    "lon": -91.0327,
    "alt_m": 13489.3
   },
   "member_spread_deg": {
    "lat": 31.17,
    "lon": 111.02
   },
   "member_spread_now_deg": {
    "lat": 0.26,
    "lon": 1.04
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DH1PR-578",
   "flight_id": "DH1PR-578_2026-09-27",
   "payload_type": "WSPR",
   "seed_time": "2026-10-02 04:56:16",
   "seed_lat": 48.0625,
   "seed_lon": 60.66667,
   "seed_alt_m": 11380.0,
   "seed_age_h": 0.4,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-09 05:00:00",
    "lat": 59.38159,
    "lon": -1.87595,
    "alt_m": 11338.6
   },
   "member_spread_deg": {
    "lat": 15.49,
    "lon": 76.12
   },
   "member_spread_now_deg": {
    "lat": 0.04,
    "lon": 0.14
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DH1PR-578e",
   "flight_id": "DH1PR-578e_2026-09-27",
   "payload_type": "WSPR",
   "seed_time": "2026-10-02 04:57:02",
   "seed_lat": 48.07578,
   "seed_lon": 60.69097,
   "seed_alt_m": 11380.0,
   "seed_age_h": 0.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-09 05:00:00",
    "lat": 59.38616,
    "lon": -2.007,
    "alt_m": 11337.5
   },
   "member_spread_deg": {
    "lat": 15.97,
    "lon": 76.83
   },
   "member_spread_now_deg": {
    "lat": 0.04,
    "lon": 0.14
   },
   "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": 18.02,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 23:45:00",
    "lat": 23.34566,
    "lon": -174.95843,
    "alt_m": 12594.3
   },
   "member_spread_deg": {
    "lat": 36.61,
    "lon": 119.67
   },
   "member_spread_now_deg": {
    "lat": 1.99,
    "lon": 0.57
   },
   "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": 328.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 23:45:00",
    "lat": 4.81325,
    "lon": -19.48098,
    "alt_m": 15324.8
   },
   "member_spread_deg": {
    "lat": 50.61,
    "lon": 283.23
   },
   "member_spread_now_deg": {
    "lat": 48.05,
    "lon": 266.68
   },
   "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": 333.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 23:30:00",
    "lat": 64.06985,
    "lon": 113.38815,
    "alt_m": 13960.2
   },
   "member_spread_deg": {
    "lat": 19.64,
    "lon": 283.81
   },
   "member_spread_now_deg": {
    "lat": 29.23,
    "lon": 70.04
   },
   "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": 304.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-08 23:45:00",
    "lat": 21.98675,
    "lon": 5.63178,
    "alt_m": 14434.1
   },
   "member_spread_deg": {
    "lat": 46.91,
    "lon": 167.95
   },
   "member_spread_now_deg": {
    "lat": 55.14,
    "lon": 268.08
   },
   "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": 37.6,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 23:45:00",
    "lat": 67.87556,
    "lon": 156.36318,
    "alt_m": 13596.6
   },
   "member_spread_deg": {
    "lat": 30.83,
    "lon": 350.51
   },
   "member_spread_now_deg": {
    "lat": 20.3,
    "lon": 23.51
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-10-02 04:43:00",
   "seed_lat": 44.9375,
   "seed_lon": 52.83333,
   "seed_alt_m": 13020.0,
   "seed_age_h": 0.62,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-09 04:15:00",
    "lat": 54.56634,
    "lon": -48.44914,
    "alt_m": 12656.9
   },
   "member_spread_deg": {
    "lat": 12.45,
    "lon": 52.17
   },
   "member_spread_now_deg": {
    "lat": 0.06,
    "lon": 0.15
   },
   "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": 288.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-08 23:30:00",
    "lat": 48.53118,
    "lon": 71.84776,
    "alt_m": 12981.5
   },
   "member_spread_deg": {
    "lat": 23.27,
    "lon": 238.03
   },
   "member_spread_now_deg": {
    "lat": 33.66,
    "lon": 109.45
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
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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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  },
  {
   "callsign": "ZS6WBT-1",
   "flight_id": "ZS6WBT-1_2026-08-19",
   "payload_type": "WSPR",
   "seed_time": "2026-10-02 00:41:00",
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   "display_as": "track",
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  }
 ]
}