{
 "generated_utc": "2026-10-02T11:27:33Z",
 "gfs_cycle_utc": "2026-10-02T06:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 496.5,
  "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_06Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20261002_06Z.geojson.gz"
 },
 "counts": {
  "flights": 51,
  "members": 9,
  "rows": 208839
 },
 "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": 211.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-09 05:45:00",
    "lat": 52.92502,
    "lon": 2.3952,
    "alt_m": 13322.8
   },
   "member_spread_deg": {
    "lat": 47.06,
    "lon": 123.46
   },
   "member_spread_now_deg": {
    "lat": 15.74,
    "lon": 343.09
   },
   "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 07:55:00",
   "seed_lat": 39.68747,
   "seed_lon": 116.29166,
   "seed_alt_m": 13050.0,
   "seed_age_h": 3.42,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-09 07:30:00",
    "lat": 43.36331,
    "lon": -6.524,
    "alt_m": 13435.0
   },
   "member_spread_deg": {
    "lat": 33.47,
    "lon": 111.44
   },
   "member_spread_now_deg": {
    "lat": 0.51,
    "lon": 1.01
   },
   "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": 6.61,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-09 05:45:00",
    "lat": -63.19843,
    "lon": 116.38035,
    "alt_m": 12008.0
   },
   "member_spread_deg": {
    "lat": 33.67,
    "lon": 310.93
   },
   "member_spread_now_deg": {
    "lat": 0.45,
    "lon": 4.01
   },
   "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": 14.53,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-09 05:45:00",
    "lat": 33.14233,
    "lon": 35.95494,
    "alt_m": 13627.4
   },
   "member_spread_deg": {
    "lat": 17.73,
    "lon": 108.17
   },
   "member_spread_now_deg": {
    "lat": 3.58,
    "lon": 2.78
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-10-02 11:01:18",
   "seed_lat": 30.91667,
   "seed_lon": -1.41667,
   "seed_alt_m": 13530.0,
   "seed_age_h": 0.31,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-09 11:00:00",
    "lat": 29.32992,
    "lon": -155.4023,
    "alt_m": 13506.7
   },
   "member_spread_deg": {
    "lat": 27.81,
    "lon": 22.61
   },
   "member_spread_now_deg": {
    "lat": 0.1,
    "lon": 0.15
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-10-02 09:35:48",
   "seed_lat": 49.4375,
   "seed_lon": -15.04167,
   "seed_alt_m": 13690.0,
   "seed_age_h": 1.74,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-09 09:00:00",
    "lat": 46.67571,
    "lon": 34.41095,
    "alt_m": 13708.7
   },
   "member_spread_deg": {
    "lat": 29.02,
    "lon": 327.92
   },
   "member_spread_now_deg": {
    "lat": 0.19,
    "lon": 0.88
   },
   "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": 291.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-09 05:30:00",
    "lat": 23.06241,
    "lon": 136.07903,
    "alt_m": 11521.5
   },
   "member_spread_deg": {
    "lat": 38.86,
    "lon": 332.08
   },
   "member_spread_now_deg": {
    "lat": 52.02,
    "lon": 224.76
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-10-02 04:33:47",
   "seed_lat": 32.41667,
   "seed_lon": 70.375,
   "seed_alt_m": 12430.0,
   "seed_age_h": 6.77,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-09 05:30:00",
    "lat": 61.70356,
    "lon": -2.89765,
    "alt_m": 12134.9
   },
   "member_spread_deg": {
    "lat": 32.65,
    "lon": 100.95
   },
   "member_spread_now_deg": {
    "lat": 2.03,
    "lon": 3.53
   },
   "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": 24.91,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-09 05:30:00",
    "lat": 42.96254,
    "lon": 5.23526,
    "alt_m": 12456.2
   },
   "member_spread_deg": {
    "lat": 26.44,
    "lon": 111.56
   },
   "member_spread_now_deg": {
    "lat": 2.89,
    "lon": 11.96
   },
   "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": 8.9,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-09 05:30:00",
    "lat": 58.66321,
    "lon": 63.9694,
    "alt_m": 12075.0
   },
   "member_spread_deg": {
    "lat": 13.69,
    "lon": 71.67
   },
   "member_spread_now_deg": {
    "lat": 0.65,
    "lon": 3.8
   },
   "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": 93.3,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-09 05:30:00",
    "lat": 31.83046,
    "lon": 79.87354,
    "alt_m": 13412.2
   },
   "member_spread_deg": {
    "lat": 21.39,
    "lon": 125.44
   },
   "member_spread_now_deg": {
    "lat": 26.57,
    "lon": 39.8
   },
   "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": 68.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-09 05:30:00",
    "lat": 60.6097,
    "lon": -117.53049,
    "alt_m": 12971.9
   },
   "member_spread_deg": {
    "lat": 22.26,
    "lon": 295.61
   },
   "member_spread_now_deg": {
    "lat": 40.07,
    "lon": 10.79
   },
   "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": 14.58,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-09 05:45:00",
    "lat": 25.01742,
    "lon": -67.9425,
    "alt_m": 13727.4
   },
   "member_spread_deg": {
    "lat": 31.32,
    "lon": 154.62
   },
   "member_spread_now_deg": {
    "lat": 7.67,
    "lon": 12.13
   },
   "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": 10.5,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-09 05:45:00",
    "lat": 37.90884,
    "lon": -100.87814,
    "alt_m": 13356.2
   },
   "member_spread_deg": {
    "lat": 29.6,
    "lon": 112.29
   },
   "member_spread_now_deg": {
    "lat": 2.05,
    "lon": 5.28
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DH1PR-578",
   "flight_id": "DH1PR-578_2026-09-27",
   "payload_type": "WSPR",
   "seed_time": "2026-10-02 10:56:16",
   "seed_lat": 48.04167,
   "seed_lon": 68.5,
   "seed_alt_m": 11420.0,
   "seed_age_h": 0.4,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-09 11:00:00",
    "lat": 62.34921,
    "lon": -0.24475,
    "alt_m": 11210.9
   },
   "member_spread_deg": {
    "lat": 15.44,
    "lon": 33.97
   },
   "member_spread_now_deg": {
    "lat": 0.1,
    "lon": 0.04
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DH1PR-578e",
   "flight_id": "DH1PR-578e_2026-09-27",
   "payload_type": "WSPR",
   "seed_time": "2026-10-02 10:52:32",
   "seed_lat": 48.04653,
   "seed_lon": 68.38021,
   "seed_alt_m": 11420.0,
   "seed_age_h": 0.46,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-09 11:00:00",
    "lat": 62.26002,
    "lon": -0.88015,
    "alt_m": 11201.5
   },
   "member_spread_deg": {
    "lat": 15.26,
    "lon": 31.64
   },
   "member_spread_now_deg": {
    "lat": 0.1,
    "lon": 0.04
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DJ2DS-35",
   "flight_id": "DJ2DS-35_2026-10-01",
   "payload_type": "WSPR",
   "seed_time": "2026-10-02 10:24:00",
   "seed_lat": 56.35417,
   "seed_lon": 88.83333,
   "seed_alt_m": 12550.0,
   "seed_age_h": 0.93,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-09 10:00:00",
    "lat": 48.04648,
    "lon": -58.49923,
    "alt_m": 12441.1
   },
   "member_spread_deg": {
    "lat": 27.0,
    "lon": 25.07
   },
   "member_spread_now_deg": {
    "lat": 0.07,
    "lon": 0.25
   },
   "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": 334.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-09 05:45:00",
    "lat": 5.844,
    "lon": -23.10936,
    "alt_m": 15288.9
   },
   "member_spread_deg": {
    "lat": 51.61,
    "lon": 290.01
   },
   "member_spread_now_deg": {
    "lat": 49.01,
    "lon": 268.67
   },
   "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": 310.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-09 05:45:00",
    "lat": 18.63205,
    "lon": -11.61123,
    "alt_m": 14459.2
   },
   "member_spread_deg": {
    "lat": 46.65,
    "lon": 190.38
   },
   "member_spread_now_deg": {
    "lat": 54.19,
    "lon": 264.6
   },
   "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": 43.6,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-09 05:45:00",
    "lat": 60.04537,
    "lon": -142.09634,
    "alt_m": 13711.5
   },
   "member_spread_deg": {
    "lat": 18.42,
    "lon": 344.04
   },
   "member_spread_now_deg": {
    "lat": 23.34,
    "lon": 16.12
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-10-02 10:48:00",
   "seed_lat": 46.8125,
   "seed_lon": 61.375,
   "seed_alt_m": 13050.0,
   "seed_age_h": 0.53,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-09 10:15:00",
    "lat": 53.12272,
    "lon": -32.87219,
    "alt_m": 12650.0
   },
   "member_spread_deg": {
    "lat": 18.97,
    "lon": 60.01
   },
   "member_spread_now_deg": {
    "lat": 0.02,
    "lon": 0.1
   },
   "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": 294.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-09 05:30:00",
    "lat": 56.70278,
    "lon": 45.85296,
    "alt_m": 12915.7
   },
   "member_spread_deg": {
    "lat": 23.45,
    "lon": 221.09
   },
   "member_spread_now_deg": {
    "lat": 26.63,
    "lon": 100.25
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-10-01 15:15:45",
   "seed_lat": 65.93745,
   "seed_lon": -11.20831,
   "seed_alt_m": 13120.0,
   "seed_age_h": 20.07,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-09 05:45:00",
    "lat": 62.52493,
    "lon": -126.64238,
    "alt_m": 12984.7
   },
   "member_spread_deg": {
    "lat": 12.17,
    "lon": 297.81
   },
   "member_spread_now_deg": {
    "lat": 4.09,
    "lon": 17.28
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KJ4AWK-1",
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  },
  {
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   "flight_id": "ZL2P-1_2026-09-28",
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   "seed_time": "2026-10-02 09:55:00",
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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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   "seed_lon": -129.16667,
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   "display_as": "track",
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  }
 ]
}