{
 "generated_utc": "2026-09-28T11:27:50Z",
 "gfs_cycle_utc": "2026-09-28T06:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 489.5,
  "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_20260928_06Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260928_06Z.geojson.gz"
 },
 "counts": {
  "flights": 47,
  "members": 9,
  "rows": 201447
 },
 "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": 115.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 05:45:00",
    "lat": 46.22976,
    "lon": -140.81693,
    "alt_m": 13397.2
   },
   "member_spread_deg": {
    "lat": 44.02,
    "lon": 356.88
   },
   "member_spread_now_deg": {
    "lat": 38.06,
    "lon": 87.74
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "AE4ZZ-23",
   "flight_id": "AE4ZZ-23_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 09:12:30",
   "seed_lat": 29.7708,
   "seed_lon": 16.33334,
   "seed_alt_m": 13380.0,
   "seed_age_h": 2.13,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 08:45:00",
    "lat": 63.81259,
    "lon": -119.72305,
    "alt_m": 12560.5
   },
   "member_spread_deg": {
    "lat": 16.13,
    "lon": 41.38
   },
   "member_spread_now_deg": {
    "lat": 0.13,
    "lon": 0.26
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 10:33:40",
   "seed_lat": -60.22916,
   "seed_lon": -1.45832,
   "seed_alt_m": 12120.0,
   "seed_age_h": 0.77,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-05 10:00:00",
    "lat": -86.83302,
    "lon": -53.04895,
    "alt_m": 12355.2
   },
   "member_spread_deg": {
    "lat": 18.48,
    "lon": 169.31
   },
   "member_spread_now_deg": {
    "lat": 0.17,
    "lon": 0.63
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 00:45:18",
   "seed_lat": 36.91667,
   "seed_lon": -132.66667,
   "seed_alt_m": 13530.0,
   "seed_age_h": 10.58,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 05:45:00",
    "lat": 17.16902,
    "lon": -84.07987,
    "alt_m": 13944.0
   },
   "member_spread_deg": {
    "lat": 37.06,
    "lon": 66.69
   },
   "member_spread_now_deg": {
    "lat": 2.75,
    "lon": 2.69
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 10:42:18",
   "seed_lat": 26.39583,
   "seed_lon": -41.75,
   "seed_alt_m": 13710.0,
   "seed_age_h": 0.63,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 10:15:00",
    "lat": 38.23033,
    "lon": 86.70379,
    "alt_m": 13509.6
   },
   "member_spread_deg": {
    "lat": 20.82,
    "lon": 60.37
   },
   "member_spread_now_deg": {
    "lat": 0.11,
    "lon": 0.06
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 21:34:18",
   "seed_lat": 54.14583,
   "seed_lon": -137.125,
   "seed_alt_m": 13300.0,
   "seed_age_h": 13.76,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 05:30:00",
    "lat": 47.06826,
    "lon": 21.56817,
    "alt_m": 13656.5
   },
   "member_spread_deg": {
    "lat": 29.54,
    "lon": 148.17
   },
   "member_spread_now_deg": {
    "lat": 1.45,
    "lon": 6.34
   },
   "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": 195.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-05 05:30:00",
    "lat": 37.05135,
    "lon": -100.7366,
    "alt_m": 11492.0
   },
   "member_spread_deg": {
    "lat": 35.95,
    "lon": 212.28
   },
   "member_spread_now_deg": {
    "lat": 25.1,
    "lon": 300.94
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 10:54:02",
   "seed_lat": 36.0,
   "seed_lon": -10.95833,
   "seed_alt_m": 12600.0,
   "seed_age_h": 0.43,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 11:00:00",
    "lat": 48.99428,
    "lon": -155.81152,
    "alt_m": 12486.3
   },
   "member_spread_deg": {
    "lat": 25.78,
    "lon": 343.81
   },
   "member_spread_now_deg": {
    "lat": 0.29,
    "lon": 0.2
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 10:15:02",
   "seed_lat": 36.72318,
   "seed_lon": -11.14479,
   "seed_alt_m": 12580.0,
   "seed_age_h": 1.08,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 09:45:00",
    "lat": 48.06409,
    "lon": -159.70638,
    "alt_m": 12432.5
   },
   "member_spread_deg": {
    "lat": 15.33,
    "lon": 342.9
   },
   "member_spread_now_deg": {
    "lat": 0.61,
    "lon": 0.34
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-30",
   "flight_id": "DG2GG-30_2026-08-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 03:21:00",
   "seed_lat": 49.54167,
   "seed_lon": 94.70833,
   "seed_alt_m": 12300.0,
   "seed_age_h": 7.98,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-05 05:45:00",
    "lat": 64.26577,
    "lon": -17.3398,
    "alt_m": 11986.5
   },
   "member_spread_deg": {
    "lat": 16.47,
    "lon": 50.3
   },
   "member_spread_now_deg": {
    "lat": 1.02,
    "lon": 4.69
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-31",
   "flight_id": "DG2GG-31_2026-08-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-27 21:47:00",
   "seed_lat": 25.35417,
   "seed_lon": -90.20833,
   "seed_alt_m": 13670.0,
   "seed_age_h": 13.55,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 05:45:00",
    "lat": 21.00782,
    "lon": -25.62029,
    "alt_m": 13724.2
   },
   "member_spread_deg": {
    "lat": 10.09,
    "lon": 60.11
   },
   "member_spread_now_deg": {
    "lat": 2.73,
    "lon": 4.09
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-32",
   "flight_id": "DG2GG-32_2026-09-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 23:16:00",
   "seed_lat": 58.95833,
   "seed_lon": -106.375,
   "seed_alt_m": 12930.0,
   "seed_age_h": 36.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 05:45:00",
    "lat": 60.2068,
    "lon": 77.34073,
    "alt_m": 12781.9
   },
   "member_spread_deg": {
    "lat": 36.99,
    "lon": 77.8
   },
   "member_spread_now_deg": {
    "lat": 14.53,
    "lon": 11.12
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 00:10:00",
   "seed_lat": 34.95833,
   "seed_lon": -140.25,
   "seed_alt_m": 13400.0,
   "seed_age_h": 11.17,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 05:45:00",
    "lat": 19.44838,
    "lon": -67.79031,
    "alt_m": 13645.0
   },
   "member_spread_deg": {
    "lat": 48.4,
    "lon": 92.0
   },
   "member_spread_now_deg": {
    "lat": 1.54,
    "lon": 6.33
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-36",
   "flight_id": "DG2GG-36_2026-09-26",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 10:45:00",
   "seed_lat": 38.25,
   "seed_lon": 24.0,
   "seed_alt_m": 13180.0,
   "seed_age_h": 0.58,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 10:15:00",
    "lat": 44.62188,
    "lon": -130.43413,
    "alt_m": 13454.2
   },
   "member_spread_deg": {
    "lat": 27.99,
    "lon": 70.6
   },
   "member_spread_now_deg": {
    "lat": 0.15,
    "lon": 0.18
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DH1PR-578",
   "flight_id": "DH1PR-578_2026-09-27",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 10:56:16",
   "seed_lat": 41.64583,
   "seed_lon": 15.95833,
   "seed_alt_m": 11680.0,
   "seed_age_h": 0.4,
   "float_reliable": false,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-05 11:00:00",
    "lat": 42.11819,
    "lon": -176.66446,
    "alt_m": 11411.4
   },
   "member_spread_deg": {
    "lat": 14.04,
    "lon": 354.28
   },
   "member_spread_now_deg": {
    "lat": 0.04,
    "lon": 0.09
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DH1PR-578e",
   "flight_id": "DH1PR-578e_2026-09-27",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 10:57:02",
   "seed_lat": 41.64384,
   "seed_lon": 15.94462,
   "seed_alt_m": 11680.0,
   "seed_age_h": 0.38,
   "float_reliable": false,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-05 11:00:00",
    "lat": 42.05634,
    "lon": -177.25525,
    "alt_m": 11412.3
   },
   "member_spread_deg": {
    "lat": 14.11,
    "lon": 355.25
   },
   "member_spread_now_deg": {
    "lat": 0.04,
    "lon": 0.09
   },
   "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": 238.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 05:45:00",
    "lat": 9.96818,
    "lon": -28.7406,
    "alt_m": 15284.0
   },
   "member_spread_deg": {
    "lat": 56.12,
    "lon": 303.5
   },
   "member_spread_now_deg": {
    "lat": 49.01,
    "lon": 110.72
   },
   "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": 243.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 05:30:00",
    "lat": 75.2413,
    "lon": 18.56218,
    "alt_m": 13931.4
   },
   "member_spread_deg": {
    "lat": 35.75,
    "lon": 70.81
   },
   "member_spread_now_deg": {
    "lat": 13.26,
    "lon": 72.13
   },
   "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": 214.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-05 05:45:00",
    "lat": -3.19961,
    "lon": -123.95688,
    "alt_m": 14461.7
   },
   "member_spread_deg": {
    "lat": 53.75,
    "lon": 284.75
   },
   "member_spread_now_deg": {
    "lat": 52.88,
    "lon": 331.31
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DO3GU-8",
   "flight_id": "DO3GU-8_2026-08-12",
   "payload_type": "APRS",
   "seed_time": "2026-09-26 19:41:35",
   "seed_lat": 47.76366,
   "seed_lon": -113.55491,
   "seed_alt_m": 14135.0,
   "seed_age_h": 39.64,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 05:45:00",
    "lat": 51.02685,
    "lon": 39.03997,
    "alt_m": 14148.1
   },
   "member_spread_deg": {
    "lat": 36.9,
    "lon": 79.07
   },
   "member_spread_now_deg": {
    "lat": 12.7,
    "lon": 34.54
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 10:13:00",
   "seed_lat": 46.125,
   "seed_lon": 12.25,
   "seed_alt_m": 13420.0,
   "seed_age_h": 1.12,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 09:45:00",
    "lat": 49.38276,
    "lon": 155.02319,
    "alt_m": 13030.9
   },
   "member_spread_deg": {
    "lat": 9.25,
    "lon": 61.49
   },
   "member_spread_now_deg": {
    "lat": 0.18,
    "lon": 0.26
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KC3LBR-485",
   "flight_id": "KC3LBR-485_2026-03-19",
   "payload_type": "WSPR",
   "seed_time": "2026-09-15 23:15:47",
   "seed_lat": 26.64583,
   "seed_lon": -149.20833,
   "seed_alt_m": 13760.0,
   "seed_age_h": 300.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-05 05:45:00",
    "lat": 36.08989,
    "lon": -177.94333,
    "alt_m": 13779.4
   },
   "member_spread_deg": {
    "lat": 53.5,
    "lon": 352.73
   },
   "member_spread_now_deg": {
    "lat": 26.2,
    "lon": 170.67
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "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": 198.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-05 05:30:00",
    "lat": 37.13574,
    "lon": 30.53461,
    "alt_m": 13012.8
   },
   "member_spread_deg": {
    "lat": 16.08,
    "lon": 207.96
   },
   "member_spread_now_deg": {
    "lat": 29.91,
    "lon": 149.16
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
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  },
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  },
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  {
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  {
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   "payload_type": "WSPR",
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 ]
}