{
 "generated_utc": "2026-09-26T23:27:44Z",
 "gfs_cycle_utc": "2026-09-26T18:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 487.0,
  "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_20260926_18Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260926_18Z.geojson.gz"
 },
 "counts": {
  "flights": 47,
  "members": 9,
  "rows": 205722
 },
 "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": 79.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 17:45:00",
    "lat": 35.5281,
    "lon": -162.58295,
    "alt_m": 13260.8
   },
   "member_spread_deg": {
    "lat": 35.79,
    "lon": 313.93
   },
   "member_spread_now_deg": {
    "lat": 55.74,
    "lon": 65.3
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "AE4ZZ-23",
   "flight_id": "AE4ZZ-23_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 14:10:00",
   "seed_lat": 36.60414,
   "seed_lon": 9.66669,
   "seed_alt_m": 13520.0,
   "seed_age_h": 9.17,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 17:45:00",
    "lat": 52.0572,
    "lon": -175.51168,
    "alt_m": 12586.5
   },
   "member_spread_deg": {
    "lat": 25.2,
    "lon": 342.27
   },
   "member_spread_now_deg": {
    "lat": 1.89,
    "lon": 1.46
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 21:33:40",
   "seed_lat": -72.83333,
   "seed_lon": -85.49999,
   "seed_alt_m": 12120.0,
   "seed_age_h": 1.77,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-03 21:00:00",
    "lat": -77.26973,
    "lon": 178.78527,
    "alt_m": 12040.0
   },
   "member_spread_deg": {
    "lat": 18.49,
    "lon": 337.23
   },
   "member_spread_now_deg": {
    "lat": 0.48,
    "lon": 2.58
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 23:05:18",
   "seed_lat": 44.85417,
   "seed_lon": -155.54167,
   "seed_alt_m": 13530.0,
   "seed_age_h": 0.25,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 23:00:00",
    "lat": 36.25992,
    "lon": -75.20002,
    "alt_m": 13809.0
   },
   "member_spread_deg": {
    "lat": 29.55,
    "lon": 39.94
   },
   "member_spread_now_deg": {
    "lat": 0.0,
    "lon": 0.0
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 19:57:18",
   "seed_lat": 48.89583,
   "seed_lon": -47.5,
   "seed_alt_m": 12990.0,
   "seed_age_h": 3.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 19:30:00",
    "lat": 40.69736,
    "lon": 139.38051,
    "alt_m": 12925.4
   },
   "member_spread_deg": {
    "lat": 16.8,
    "lon": 96.99
   },
   "member_spread_now_deg": {
    "lat": 2.06,
    "lon": 6.02
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 23:02:18",
   "seed_lat": 49.29167,
   "seed_lon": -177.16667,
   "seed_alt_m": 13450.0,
   "seed_age_h": 0.3,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 23:00:00",
    "lat": 66.8976,
    "lon": 17.39055,
    "alt_m": 13435.1
   },
   "member_spread_deg": {
    "lat": 31.12,
    "lon": 160.73
   },
   "member_spread_now_deg": {
    "lat": 0.09,
    "lon": 0.47
   },
   "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": 159.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-03 17:30:00",
    "lat": 40.09322,
    "lon": -97.3864,
    "alt_m": 11379.7
   },
   "member_spread_deg": {
    "lat": 17.85,
    "lon": 176.58
   },
   "member_spread_now_deg": {
    "lat": 23.04,
    "lon": 329.09
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 20:33:46",
   "seed_lat": 48.70833,
   "seed_lon": -73.75,
   "seed_alt_m": 12420.0,
   "seed_age_h": 2.77,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 20:00:00",
    "lat": 35.97556,
    "lon": 90.25068,
    "alt_m": 12395.1
   },
   "member_spread_deg": {
    "lat": 13.0,
    "lon": 121.57
   },
   "member_spread_now_deg": {
    "lat": 0.77,
    "lon": 2.69
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 20:06:02",
   "seed_lat": 48.62734,
   "seed_lon": -73.94479,
   "seed_alt_m": 12430.0,
   "seed_age_h": 3.23,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 19:30:00",
    "lat": 34.32122,
    "lon": 85.20747,
    "alt_m": 12418.8
   },
   "member_spread_deg": {
    "lat": 36.19,
    "lon": 56.84
   },
   "member_spread_now_deg": {
    "lat": 0.81,
    "lon": 2.71
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-30",
   "flight_id": "DG2GG-30_2026-08-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 11:56:00",
   "seed_lat": 72.0,
   "seed_lon": 49.83333,
   "seed_alt_m": 12800.0,
   "seed_age_h": 11.4,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 17:30:00",
    "lat": 57.16839,
    "lon": -120.67139,
    "alt_m": 12654.0
   },
   "member_spread_deg": {
    "lat": 15.66,
    "lon": 90.71
   },
   "member_spread_now_deg": {
    "lat": 2.08,
    "lon": 7.76
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-31",
   "flight_id": "DG2GG-31_2026-08-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 22:07:00",
   "seed_lat": 33.39583,
   "seed_lon": -120.875,
   "seed_alt_m": 13380.0,
   "seed_age_h": 1.22,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 21:30:00",
    "lat": 23.12734,
    "lon": -16.56918,
    "alt_m": 13558.3
   },
   "member_spread_deg": {
    "lat": 17.27,
    "lon": 124.07
   },
   "member_spread_now_deg": {
    "lat": 0.5,
    "lon": 0.46
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-32",
   "flight_id": "DG2GG-32_2026-09-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 22:01:00",
   "seed_lat": 58.25,
   "seed_lon": -107.45833,
   "seed_alt_m": 12910.0,
   "seed_age_h": 1.32,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 21:30:00",
    "lat": 58.31131,
    "lon": 37.27384,
    "alt_m": 13418.7
   },
   "member_spread_deg": {
    "lat": 37.3,
    "lon": 79.71
   },
   "member_spread_now_deg": {
    "lat": 0.41,
    "lon": 0.9
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 22:40:00",
   "seed_lat": 41.375,
   "seed_lon": -156.91667,
   "seed_alt_m": 13420.0,
   "seed_age_h": 0.67,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 22:15:00",
    "lat": 19.47731,
    "lon": -77.43179,
    "alt_m": 13665.5
   },
   "member_spread_deg": {
    "lat": 45.25,
    "lon": 27.36
   },
   "member_spread_now_deg": {
    "lat": 0.08,
    "lon": 0.16
   },
   "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": 202.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 17:45:00",
    "lat": 5.19077,
    "lon": -28.23272,
    "alt_m": 15320.2
   },
   "member_spread_deg": {
    "lat": 46.0,
    "lon": 288.2
   },
   "member_spread_now_deg": {
    "lat": 51.75,
    "lon": 87.44
   },
   "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": 207.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 17:30:00",
    "lat": 45.75068,
    "lon": 71.29039,
    "alt_m": 14509.6
   },
   "member_spread_deg": {
    "lat": 32.66,
    "lon": 125.25
   },
   "member_spread_now_deg": {
    "lat": 10.32,
    "lon": 42.94
   },
   "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": 178.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-03 17:45:00",
    "lat": 3.1995,
    "lon": -106.14805,
    "alt_m": 14457.4
   },
   "member_spread_deg": {
    "lat": 66.27,
    "lon": 311.67
   },
   "member_spread_now_deg": {
    "lat": 41.86,
    "lon": 355.1
   },
   "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": 3.64,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 19:15:00",
    "lat": 69.40007,
    "lon": 62.55528,
    "alt_m": 14072.1
   },
   "member_spread_deg": {
    "lat": 40.37,
    "lon": 71.93
   },
   "member_spread_now_deg": {
    "lat": 0.8,
    "lon": 1.93
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 15:43:00",
   "seed_lat": 46.35417,
   "seed_lon": -3.83333,
   "seed_alt_m": 13430.0,
   "seed_age_h": 7.62,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 17:45:00",
    "lat": 41.13477,
    "lon": 115.218,
    "alt_m": 13025.9
   },
   "member_spread_deg": {
    "lat": 6.26,
    "lon": 95.5
   },
   "member_spread_now_deg": {
    "lat": 1.7,
    "lon": 1.13
   },
   "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": 264.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-03 17:45:00",
    "lat": 16.67969,
    "lon": 59.80672,
    "alt_m": 13870.9
   },
   "member_spread_deg": {
    "lat": 43.18,
    "lon": 178.73
   },
   "member_spread_now_deg": {
    "lat": 51.73,
    "lon": 137.25
   },
   "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": 162.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 17:30:00",
    "lat": 66.24423,
    "lon": 56.43394,
    "alt_m": 12802.9
   },
   "member_spread_deg": {
    "lat": 58.65,
    "lon": 251.43
   },
   "member_spread_now_deg": {
    "lat": 32.26,
    "lon": 88.29
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KE8RES-8",
   "flight_id": "KE8RES-8_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-09-13 13:01:00",
   "seed_lat": 42.0625,
   "seed_lon": 28.04167,
   "seed_alt_m": 12700.0,
   "seed_age_h": 322.32,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 17:30:00",
    "lat": 47.05855,
    "lon": 139.11708,
    "alt_m": 12217.0
   },
   "member_spread_deg": {
    "lat": 31.6,
    "lon": 281.36
   },
   "member_spread_now_deg": {
    "lat": 48.16,
    "lon": 186.78
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 17:45:45",
   "seed_lat": 68.62495,
   "seed_lon": -51.87498,
   "seed_alt_m": 12840.0,
   "seed_age_h": 5.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 17:45:00",
    "lat": 79.26149,
    "lon": -32.82568,
    "alt_m": 12828.8
   },
   "member_spread_deg": {
    "lat": 42.85,
    "lon": 117.29
   },
   "member_spread_now_deg": {
    "lat": 0.84,
    "lon": 1.57
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KJ4AWK-1",
   "flight_id": "KJ4AWK-1_2026-08-22",
   "payload_type": "APRS",
   "seed_time": "2026-09-26 23:04:17",
   "seed_lat": 58.99234,
   "seed_lon": -116.58717,
   "seed_alt_m": 12175.0,
   "seed_age_h": 0.26,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-03 23:00:00",
    "lat": 60.56937,
    "lon": -0.91905,
    "alt_m": 12281.4
   },
   "member_spread_deg": {
    "lat": 18.86,
    "lon": 181.52
   },
   "member_spread_now_deg": {
    "lat": 0.1,
    "lon": 0.36
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
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  },
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   "seed_time": "2026-09-26 20:03:25",
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  },
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  },
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  },
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  },
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  },
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  },
  {
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  },
  {
   "callsign": "ZS6WBT-1",
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   "payload_type": "WSPR",
   "seed_time": "2026-09-26 22:03:30",
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  }
 ]
}