{
 "generated_utc": "2026-09-21T05:28:00Z",
 "gfs_cycle_utc": "2026-09-21T00:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 490.0,
  "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_20260921_00Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260921_00Z.geojson.gz"
 },
 "counts": {
  "flights": 51,
  "members": 9,
  "rows": 220320
 },
 "flights": [
  {
   "callsign": "AE4ZZ-22",
   "flight_id": "AE4ZZ-22_2026-09-19",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 19:53:45",
   "seed_lat": 36.85412,
   "seed_lon": -81.16661,
   "seed_alt_m": 13520.0,
   "seed_age_h": 9.44,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 23:30:00",
    "lat": 33.7807,
    "lon": 24.1226,
    "alt_m": 13301.4
   },
   "member_spread_deg": {
    "lat": 31.94,
    "lon": 28.49
   },
   "member_spread_now_deg": {
    "lat": 1.6,
    "lon": 3.1
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 00:18:40",
   "seed_lat": -74.29167,
   "seed_lon": -123.99999,
   "seed_alt_m": 12180.0,
   "seed_age_h": 29.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-27 23:45:00",
    "lat": -54.69479,
    "lon": -68.62518,
    "alt_m": 12488.1
   },
   "member_spread_deg": {
    "lat": 12.12,
    "lon": 66.92
   },
   "member_spread_now_deg": {
    "lat": 6.9,
    "lon": 12.64
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AI4SR-1",
   "flight_id": "AI4SR-1_2026-09-03",
   "payload_type": "APRS",
   "seed_time": "2026-09-07 13:29:52",
   "seed_lat": 11.02275,
   "seed_lon": -74.40442,
   "seed_alt_m": 12430.0,
   "seed_age_h": 327.84,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 23:30:00",
    "lat": -22.29274,
    "lon": -79.87701,
    "alt_m": 12319.8
   },
   "member_spread_deg": {
    "lat": 68.99,
    "lon": 332.74
   },
   "member_spread_now_deg": {
    "lat": 51.65,
    "lon": 181.98
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "AI4SR-2",
   "flight_id": "AI4SR-2_2026-09-04",
   "payload_type": "APRS",
   "seed_time": "2026-09-07 15:52:34",
   "seed_lat": 11.26191,
   "seed_lon": -74.64716,
   "seed_alt_m": 13006.0,
   "seed_age_h": 325.46,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 23:30:00",
    "lat": 39.52917,
    "lon": -166.1826,
    "alt_m": 12819.3
   },
   "member_spread_deg": {
    "lat": 65.37,
    "lon": 284.6
   },
   "member_spread_now_deg": {
    "lat": 44.93,
    "lon": 155.68
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 03:12:18",
   "seed_lat": 41.02083,
   "seed_lon": 122.95833,
   "seed_alt_m": 13410.0,
   "seed_age_h": 2.13,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 02:45:00",
    "lat": 46.43288,
    "lon": -149.29824,
    "alt_m": 13264.9
   },
   "member_spread_deg": {
    "lat": 46.53,
    "lon": 309.36
   },
   "member_spread_now_deg": {
    "lat": 0.25,
    "lon": 0.56
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 04:46:18",
   "seed_lat": 47.875,
   "seed_lon": 113.45833,
   "seed_alt_m": 12840.0,
   "seed_age_h": 0.56,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 04:45:00",
    "lat": 25.62051,
    "lon": -33.35055,
    "alt_m": 13383.7
   },
   "member_spread_deg": {
    "lat": 45.56,
    "lon": 125.55
   },
   "member_spread_now_deg": {
    "lat": 0.05,
    "lon": 0.1
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-18 15:23:18",
   "seed_lat": 40.79167,
   "seed_lon": 19.75,
   "seed_alt_m": 14090.0,
   "seed_age_h": 61.95,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 23:30:00",
    "lat": 50.40315,
    "lon": -152.00205,
    "alt_m": 13425.6
   },
   "member_spread_deg": {
    "lat": 30.04,
    "lon": 343.95
   },
   "member_spread_now_deg": {
    "lat": 5.77,
    "lon": 26.43
   },
   "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": 21.85,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 23:30:00",
    "lat": 32.98185,
    "lon": 50.77155,
    "alt_m": 11578.3
   },
   "member_spread_deg": {
    "lat": 29.58,
    "lon": 227.97
   },
   "member_spread_now_deg": {
    "lat": 3.4,
    "lon": 7.39
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 04:44:17",
   "seed_lat": 44.91667,
   "seed_lon": 79.20833,
   "seed_alt_m": 12240.0,
   "seed_age_h": 24.6,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-27 23:45:00",
    "lat": 31.6761,
    "lon": -25.96746,
    "alt_m": 12612.4
   },
   "member_spread_deg": {
    "lat": 41.18,
    "lon": 117.05
   },
   "member_spread_now_deg": {
    "lat": 1.99,
    "lon": 2.61
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 04:45:02",
   "seed_lat": 44.90608,
   "seed_lon": 79.22761,
   "seed_alt_m": 12240.0,
   "seed_age_h": 24.58,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-27 23:45:00",
    "lat": 44.13879,
    "lon": -4.30553,
    "alt_m": 12386.3
   },
   "member_spread_deg": {
    "lat": 39.65,
    "lon": 117.36
   },
   "member_spread_now_deg": {
    "lat": 1.99,
    "lon": 2.63
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-25",
   "flight_id": "DG2GG-25_2026-06-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-07 21:12:00",
   "seed_lat": 24.22917,
   "seed_lon": -100.08333,
   "seed_alt_m": 13800.0,
   "seed_age_h": 320.13,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-27 23:45:00",
    "lat": 19.78251,
    "lon": 7.69848,
    "alt_m": 13903.7
   },
   "member_spread_deg": {
    "lat": 51.85,
    "lon": 287.96
   },
   "member_spread_now_deg": {
    "lat": 39.55,
    "lon": 200.9
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DG2GG-30",
   "flight_id": "DG2GG-30_2026-08-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 13:41:00",
   "seed_lat": 63.45833,
   "seed_lon": 14.16667,
   "seed_alt_m": 11910.0,
   "seed_age_h": 15.65,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-27 23:45:00",
    "lat": 36.43926,
    "lon": 34.53841,
    "alt_m": 12963.7
   },
   "member_spread_deg": {
    "lat": 36.12,
    "lon": 79.77
   },
   "member_spread_now_deg": {
    "lat": 0.7,
    "lon": 0.7
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-31",
   "flight_id": "DG2GG-31_2026-08-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 04:32:00",
   "seed_lat": 41.41667,
   "seed_lon": 67.79167,
   "seed_alt_m": 13210.0,
   "seed_age_h": 0.8,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 04:00:00",
    "lat": 68.69036,
    "lon": -77.84953,
    "alt_m": 12771.7
   },
   "member_spread_deg": {
    "lat": 34.71,
    "lon": 34.54
   },
   "member_spread_now_deg": {
    "lat": 0.11,
    "lon": 0.21
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-32",
   "flight_id": "DG2GG-32_2026-09-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 10:26:00",
   "seed_lat": 46.33333,
   "seed_lon": 60.45833,
   "seed_alt_m": 13460.0,
   "seed_age_h": 18.9,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 23:30:00",
    "lat": 67.54077,
    "lon": -90.03695,
    "alt_m": 12928.2
   },
   "member_spread_deg": {
    "lat": 20.83,
    "lon": 75.09
   },
   "member_spread_now_deg": {
    "lat": 2.77,
    "lon": 1.87
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 07:05:00",
   "seed_lat": 43.1875,
   "seed_lon": 94.91667,
   "seed_alt_m": 13190.0,
   "seed_age_h": 22.25,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 23:30:00",
    "lat": 45.38184,
    "lon": -136.43168,
    "alt_m": 13185.1
   },
   "member_spread_deg": {
    "lat": 42.89,
    "lon": 313.07
   },
   "member_spread_now_deg": {
    "lat": 1.14,
    "lon": 9.91
   },
   "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": 64.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 23:45:00",
    "lat": 20.87953,
    "lon": -45.57353,
    "alt_m": 15281.7
   },
   "member_spread_deg": {
    "lat": 51.44,
    "lon": 99.02
   },
   "member_spread_now_deg": {
    "lat": 11.43,
    "lon": 13.09
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 69.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 23:30:00",
    "lat": 70.2441,
    "lon": -106.30661,
    "alt_m": 14133.4
   },
   "member_spread_deg": {
    "lat": 10.74,
    "lon": 36.21
   },
   "member_spread_now_deg": {
    "lat": 6.76,
    "lon": 12.04
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 40.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-27 23:45:00",
    "lat": 38.87354,
    "lon": -132.55773,
    "alt_m": 14032.8
   },
   "member_spread_deg": {
    "lat": 45.91,
    "lon": 92.3
   },
   "member_spread_now_deg": {
    "lat": 2.59,
    "lon": 23.32
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DO3GU-8",
   "flight_id": "DO3GU-8_2026-08-12",
   "payload_type": "APRS",
   "seed_time": "2026-09-18 08:14:06",
   "seed_lat": 42.27058,
   "seed_lon": 26.24284,
   "seed_alt_m": 14576.0,
   "seed_age_h": 69.1,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 23:45:00",
    "lat": 58.65967,
    "lon": -84.04586,
    "alt_m": 13918.7
   },
   "member_spread_deg": {
    "lat": 19.81,
    "lon": 303.1
   },
   "member_spread_now_deg": {
    "lat": 1.81,
    "lon": 15.11
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 23:13:00",
   "seed_lat": 34.83333,
   "seed_lon": -114.83333,
   "seed_alt_m": 13480.0,
   "seed_age_h": 6.12,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 23:45:00",
    "lat": 44.88294,
    "lon": 5.96426,
    "alt_m": 13287.4
   },
   "member_spread_deg": {
    "lat": 42.29,
    "lon": 115.86
   },
   "member_spread_now_deg": {
    "lat": 0.4,
    "lon": 3.0
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "I1RFQ",
   "flight_id": "I1RFQ_2026-09-06",
   "payload_type": "WSPR",
   "seed_time": "2026-09-10 05:25:00",
   "seed_lat": 48.52083,
   "seed_lon": 159.54167,
   "seed_alt_m": 12130.0,
   "seed_age_h": 263.92,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-27 23:30:00",
    "lat": 17.25213,
    "lon": 15.52716,
    "alt_m": 12732.2
   },
   "member_spread_deg": {
    "lat": 44.45,
    "lon": 232.26
   },
   "member_spread_now_deg": {
    "lat": 36.86,
    "lon": 257.85
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "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": 126.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 23:45:00",
    "lat": 28.65441,
    "lon": -45.89001,
    "alt_m": 13906.5
   },
   "member_spread_deg": {
    "lat": 38.07,
    "lon": 103.63
   },
   "member_spread_now_deg": {
    "lat": 28.71,
    "lon": 86.36
   },
   "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": 24.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 23:30:00",
    "lat": 43.45598,
    "lon": -61.85057,
    "alt_m": 13071.4
   },
   "member_spread_deg": {
    "lat": 16.53,
    "lon": 33.74
   },
   "member_spread_now_deg": {
    "lat": 7.37,
    "lon": 2.98
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KD7FXO-1",
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   "display_reason": "member_spread"
  },
  {
   "callsign": "W7EEU-11",
   "flight_id": "W7EEU-11_2026-08-23",
   "payload_type": "APRS",
   "seed_time": "2026-09-19 14:28:59",
   "seed_lat": 63.95584,
   "seed_lon": 16.81967,
   "seed_alt_m": 11926.0,
   "seed_age_h": 38.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-27 23:30:00",
    "lat": 51.16477,
    "lon": -173.98198,
    "alt_m": 12027.3
   },
   "member_spread_deg": {
    "lat": 24.83,
    "lon": 159.74
   },
   "member_spread_now_deg": {
    "lat": 7.25,
    "lon": 36.14
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "WD4CFN-21",
   "flight_id": "WD4CFN-21_2026-09-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 16:23:54",
   "seed_lat": 26.43741,
   "seed_lon": -36.79154,
   "seed_alt_m": 13120.0,
   "seed_age_h": 12.94,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-27 23:30:00",
    "lat": 39.64171,
    "lon": 148.57585,
    "alt_m": 12953.7
   },
   "member_spread_deg": {
    "lat": 7.87,
    "lon": 58.11
   },
   "member_spread_now_deg": {
    "lat": 1.0,
    "lon": 2.82
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "ZS6WBT-1",
   "flight_id": "ZS6WBT-1_2026-08-19",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 02:56:00",
   "seed_lat": -13.54167,
   "seed_lon": 153.875,
   "seed_alt_m": 15830.0,
   "seed_age_h": 2.4,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-28 02:30:00",
    "lat": -20.17049,
    "lon": -164.90416,
    "alt_m": 15723.2
   },
   "member_spread_deg": {
    "lat": 9.08,
    "lon": 343.71
   },
   "member_spread_now_deg": {
    "lat": 0.54,
    "lon": 0.48
   },
   "display_as": "track",
   "display_reason": "fresh"
  }
 ]
}