{
 "generated_utc": "2026-09-23T23:27:56Z",
 "gfs_cycle_utc": "2026-09-23T18:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 492.0,
  "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_20260923_18Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260923_18Z.geojson.gz"
 },
 "counts": {
  "flights": 50,
  "members": 9,
  "rows": 215991
 },
 "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": 7.69,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 17:45:00",
    "lat": 41.56442,
    "lon": 61.15624,
    "alt_m": 13160.3
   },
   "member_spread_deg": {
    "lat": 26.58,
    "lon": 124.25
   },
   "member_spread_now_deg": {
    "lat": 2.44,
    "lon": 2.42
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AE4ZZ-23",
   "flight_id": "AE4ZZ-23_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 17:15:00",
   "seed_lat": 41.72914,
   "seed_lon": -38.45829,
   "seed_alt_m": 13520.0,
   "seed_age_h": 6.08,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 17:45:00",
    "lat": 38.85109,
    "lon": 74.40782,
    "alt_m": 13236.2
   },
   "member_spread_deg": {
    "lat": 45.43,
    "lon": 90.77
   },
   "member_spread_now_deg": {
    "lat": 0.95,
    "lon": 1.54
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 09:58:40",
   "seed_lat": -67.77083,
   "seed_lon": 60.37501,
   "seed_alt_m": 12360.0,
   "seed_age_h": 13.36,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 17:30:00",
    "lat": -69.39513,
    "lon": 7.99917,
    "alt_m": 12017.4
   },
   "member_spread_deg": {
    "lat": 13.74,
    "lon": 61.81
   },
   "member_spread_now_deg": {
    "lat": 1.59,
    "lon": 11.41
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AIRCOR-6",
   "flight_id": "AIRCOR-6_2026-09-14",
   "payload_type": "APRS",
   "seed_time": "2026-09-23 15:39:13",
   "seed_lat": 40.33008,
   "seed_lon": -104.83542,
   "seed_alt_m": 15554.0,
   "seed_age_h": 7.68,
   "float_reliable": false,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 17:45:00",
    "lat": 29.18829,
    "lon": -52.54313,
    "alt_m": 15799.8
   },
   "member_spread_deg": {
    "lat": 22.64,
    "lon": 64.93
   },
   "member_spread_now_deg": {
    "lat": 1.49,
    "lon": 6.04
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 20:32:03",
   "seed_lat": 23.95833,
   "seed_lon": 168.58333,
   "seed_alt_m": 13810.0,
   "seed_age_h": 26.8,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-30 17:30:00",
    "lat": 24.4035,
    "lon": -139.92388,
    "alt_m": 13862.9
   },
   "member_spread_deg": {
    "lat": 26.97,
    "lon": 290.11
   },
   "member_spread_now_deg": {
    "lat": 7.93,
    "lon": 14.46
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 21:59:03",
   "seed_lat": 42.83333,
   "seed_lon": -129.79167,
   "seed_alt_m": 13100.0,
   "seed_age_h": 1.35,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 21:30:00",
    "lat": 36.597,
    "lon": 10.46696,
    "alt_m": 13171.8
   },
   "member_spread_deg": {
    "lat": 24.84,
    "lon": 83.84
   },
   "member_spread_now_deg": {
    "lat": 0.48,
    "lon": 0.82
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 10:36:18",
   "seed_lat": 44.4375,
   "seed_lon": 73.16667,
   "seed_alt_m": 13890.0,
   "seed_age_h": 12.73,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-30 17:30:00",
    "lat": 52.8304,
    "lon": -83.70382,
    "alt_m": 13743.2
   },
   "member_spread_deg": {
    "lat": 16.49,
    "lon": 116.72
   },
   "member_spread_now_deg": {
    "lat": 0.38,
    "lon": 4.05
   },
   "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": 87.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-30 17:30:00",
    "lat": 40.59724,
    "lon": -158.38528,
    "alt_m": 11537.2
   },
   "member_spread_deg": {
    "lat": 35.7,
    "lon": 263.63
   },
   "member_spread_now_deg": {
    "lat": 15.03,
    "lon": 63.34
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 22:54:01",
   "seed_lat": 45.72917,
   "seed_lon": -131.66667,
   "seed_alt_m": 12260.0,
   "seed_age_h": 0.43,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-30 23:00:00",
    "lat": 50.72083,
    "lon": 63.95223,
    "alt_m": 11977.5
   },
   "member_spread_deg": {
    "lat": 35.14,
    "lon": 125.57
   },
   "member_spread_now_deg": {
    "lat": 0.06,
    "lon": 0.37
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 22:55:32",
   "seed_lat": 45.72656,
   "seed_lon": -131.67986,
   "seed_alt_m": 12260.0,
   "seed_age_h": 0.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-30 23:00:00",
    "lat": 51.86659,
    "lon": 64.78041,
    "alt_m": 11949.4
   },
   "member_spread_deg": {
    "lat": 35.17,
    "lon": 138.64
   },
   "member_spread_now_deg": {
    "lat": 0.06,
    "lon": 0.37
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-30",
   "flight_id": "DG2GG-30_2026-08-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 13:21:00",
   "seed_lat": 40.22917,
   "seed_lon": 25.54167,
   "seed_alt_m": 12550.0,
   "seed_age_h": 9.98,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 17:45:00",
    "lat": 46.73137,
    "lon": 98.09844,
    "alt_m": 12831.1
   },
   "member_spread_deg": {
    "lat": 12.26,
    "lon": 142.36
   },
   "member_spread_now_deg": {
    "lat": 5.97,
    "lon": 1.21
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-31",
   "flight_id": "DG2GG-31_2026-08-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 22:32:00",
   "seed_lat": 48.8125,
   "seed_lon": 176.08333,
   "seed_alt_m": 12790.0,
   "seed_age_h": 0.8,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 22:00:00",
    "lat": 40.71594,
    "lon": -57.2854,
    "alt_m": 13302.4
   },
   "member_spread_deg": {
    "lat": 58.31,
    "lon": 128.91
   },
   "member_spread_now_deg": {
    "lat": 0.15,
    "lon": 0.49
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-32",
   "flight_id": "DG2GG-32_2026-09-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 06:46:00",
   "seed_lat": 43.77083,
   "seed_lon": 101.5,
   "seed_alt_m": 13410.0,
   "seed_age_h": 40.57,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 17:45:00",
    "lat": 53.30503,
    "lon": -30.90496,
    "alt_m": 12669.7
   },
   "member_spread_deg": {
    "lat": 10.56,
    "lon": 62.63
   },
   "member_spread_now_deg": {
    "lat": 2.91,
    "lon": 14.07
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 04:20:00",
   "seed_lat": 24.25,
   "seed_lon": 164.375,
   "seed_alt_m": 13520.0,
   "seed_age_h": 19.0,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 17:45:00",
    "lat": 18.66537,
    "lon": -139.88685,
    "alt_m": 13553.5
   },
   "member_spread_deg": {
    "lat": 31.25,
    "lon": 257.7
   },
   "member_spread_now_deg": {
    "lat": 3.74,
    "lon": 9.29
   },
   "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": 130.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 17:45:00",
    "lat": 1.6517,
    "lon": -45.47219,
    "alt_m": 15260.4
   },
   "member_spread_deg": {
    "lat": 52.06,
    "lon": 142.99
   },
   "member_spread_now_deg": {
    "lat": 32.41,
    "lon": 48.52
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "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": 135.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 17:30:00",
    "lat": 57.85938,
    "lon": -19.38704,
    "alt_m": 13954.7
   },
   "member_spread_deg": {
    "lat": 9.81,
    "lon": 38.07
   },
   "member_spread_now_deg": {
    "lat": 13.39,
    "lon": 41.62
   },
   "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": 106.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-30 17:45:00",
    "lat": 33.28914,
    "lon": -141.40727,
    "alt_m": 14249.3
   },
   "member_spread_deg": {
    "lat": 44.92,
    "lon": 308.02
   },
   "member_spread_now_deg": {
    "lat": 25.76,
    "lon": 350.01
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "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": 135.1,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 17:45:00",
    "lat": 43.67601,
    "lon": 0.58047,
    "alt_m": 14626.2
   },
   "member_spread_deg": {
    "lat": 27.45,
    "lon": 123.76
   },
   "member_spread_now_deg": {
    "lat": 4.5,
    "lon": 66.79
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 17:58:00",
   "seed_lat": 42.97917,
   "seed_lon": -54.41667,
   "seed_alt_m": 13380.0,
   "seed_age_h": 5.37,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 17:30:00",
    "lat": 46.70815,
    "lon": 53.132,
    "alt_m": 13090.8
   },
   "member_spread_deg": {
    "lat": 21.57,
    "lon": 346.11
   },
   "member_spread_now_deg": {
    "lat": 1.33,
    "lon": 7.67
   },
   "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": 329.92,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-30 17:30:00",
    "lat": 31.80921,
    "lon": -54.26116,
    "alt_m": 12826.8
   },
   "member_spread_deg": {
    "lat": 62.99,
    "lon": 306.38
   },
   "member_spread_now_deg": {
    "lat": 47.33,
    "lon": 228.48
   },
   "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": 192.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 17:45:00",
    "lat": 31.41068,
    "lon": 56.35457,
    "alt_m": 13716.3
   },
   "member_spread_deg": {
    "lat": 38.17,
    "lon": 344.6
   },
   "member_spread_now_deg": {
    "lat": 32.12,
    "lon": 105.4
   },
   "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": 90.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 17:30:00",
    "lat": 46.61859,
    "lon": -20.67798,
    "alt_m": 12930.4
   },
   "member_spread_deg": {
    "lat": 20.9,
    "lon": 150.5
   },
   "member_spread_now_deg": {
    "lat": 10.15,
    "lon": 45.08
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "KD7FXO-1",
   "flight_id": "KD7FXO-1_2026-08-02",
   "payload_type": "WSPR",
   "seed_time": "2026-09-12 06:05:00",
   "seed_lat": 45.47917,
   "seed_lon": 159.375,
   "seed_alt_m": 12660.0,
   "seed_age_h": 281.25,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 17:30:00",
    "lat": 56.77281,
    "lon": -95.02598,
    "alt_m": 12076.2
   },
   "member_spread_deg": {
    "lat": 40.1,
    "lon": 355.59
   },
   "member_spread_now_deg": {
    "lat": 40.58,
    "lon": 188.91
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KE8RES-8",
   "flight_id": "KE8RES-8_2026-06-20",
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   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "WD4CFN-21",
   "flight_id": "WD4CFN-21_2026-09-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 12:35:33",
   "seed_lat": 21.45828,
   "seed_lon": 25.6251,
   "seed_alt_m": 13090.0,
   "seed_age_h": 10.74,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 17:30:00",
    "lat": 31.98451,
    "lon": -161.41084,
    "alt_m": 13164.2
   },
   "member_spread_deg": {
    "lat": 10.93,
    "lon": 355.85
   },
   "member_spread_now_deg": {
    "lat": 3.29,
    "lon": 2.53
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "ZS6WBT-1",
   "flight_id": "ZS6WBT-1_2026-08-19",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 21:56:00",
   "seed_lat": -12.6875,
   "seed_lon": 161.41667,
   "seed_alt_m": 15940.0,
   "seed_age_h": 1.4,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-30 21:30:00",
    "lat": -30.74806,
    "lon": -80.63545,
    "alt_m": 15517.0
   },
   "member_spread_deg": {
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   },
   "member_spread_now_deg": {
    "lat": 0.06,
    "lon": 0.2
   },
   "display_as": "track",
   "display_reason": "fresh"
  }
 ]
}