{
 "generated_utc": "2026-09-29T17:28:01Z",
 "gfs_cycle_utc": "2026-09-29T12:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 492.5,
  "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_20260929_12Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260929_12Z.geojson.gz"
 },
 "counts": {
  "flights": 48,
  "members": 9,
  "rows": 200259
 },
 "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": 145.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 11:45:00",
    "lat": 38.04221,
    "lon": -98.33303,
    "alt_m": 13383.8
   },
   "member_spread_deg": {
    "lat": 51.56,
    "lon": 72.63
   },
   "member_spread_now_deg": {
    "lat": 35.86,
    "lon": 92.28
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "AE4ZZ-23",
   "flight_id": "AE4ZZ-23_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 14:00:00",
   "seed_lat": 38.2083,
   "seed_lon": 33.29167,
   "seed_alt_m": 13150.0,
   "seed_age_h": 3.33,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 13:30:00",
    "lat": 43.71049,
    "lon": -118.91061,
    "alt_m": 13270.5
   },
   "member_spread_deg": {
    "lat": 26.44,
    "lon": 56.19
   },
   "member_spread_now_deg": {
    "lat": 0.3,
    "lon": 1.06
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 10:58:40",
   "seed_lat": -67.5625,
   "seed_lon": 74.41668,
   "seed_alt_m": 12150.0,
   "seed_age_h": 6.36,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-06 11:30:00",
    "lat": -51.2997,
    "lon": 0.97136,
    "alt_m": 12217.5
   },
   "member_spread_deg": {
    "lat": 38.15,
    "lon": 276.2
   },
   "member_spread_now_deg": {
    "lat": 1.74,
    "lon": 13.56
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 16:55:18",
   "seed_lat": 44.97917,
   "seed_lon": -90.29167,
   "seed_alt_m": 13450.0,
   "seed_age_h": 0.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 17:00:00",
    "lat": 20.05759,
    "lon": -78.52507,
    "alt_m": 13915.2
   },
   "member_spread_deg": {
    "lat": 12.11,
    "lon": 36.29
   },
   "member_spread_now_deg": {
    "lat": 0.09,
    "lon": 0.41
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 16:56:17",
   "seed_lat": 18.625,
   "seed_lon": -37.91667,
   "seed_alt_m": 13520.0,
   "seed_age_h": 0.4,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 17:00:00",
    "lat": 44.55914,
    "lon": 97.92202,
    "alt_m": 13295.4
   },
   "member_spread_deg": {
    "lat": 12.35,
    "lon": 53.01
   },
   "member_spread_now_deg": {
    "lat": 0.12,
    "lon": 0.07
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 22:19:48",
   "seed_lat": 57.77083,
   "seed_lon": -110.79167,
   "seed_alt_m": 13260.0,
   "seed_age_h": 19.0,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 11:45:00",
    "lat": 46.70926,
    "lon": 71.14302,
    "alt_m": 13557.1
   },
   "member_spread_deg": {
    "lat": 20.6,
    "lon": 156.48
   },
   "member_spread_now_deg": {
    "lat": 1.41,
    "lon": 5.43
   },
   "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": 225.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-06 11:30:00",
    "lat": 39.2642,
    "lon": -90.35724,
    "alt_m": 11548.2
   },
   "member_spread_deg": {
    "lat": 24.18,
    "lon": 260.95
   },
   "member_spread_now_deg": {
    "lat": 22.88,
    "lon": 289.89
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 15:39:47",
   "seed_lat": 26.54167,
   "seed_lon": 4.83333,
   "seed_alt_m": 12680.0,
   "seed_age_h": 1.67,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 15:15:00",
    "lat": 35.53311,
    "lon": -141.63013,
    "alt_m": 12181.1
   },
   "member_spread_deg": {
    "lat": 24.14,
    "lon": 62.72
   },
   "member_spread_now_deg": {
    "lat": 0.11,
    "lon": 0.68
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 14:55:32",
   "seed_lat": 26.44306,
   "seed_lon": 4.26233,
   "seed_alt_m": 12700.0,
   "seed_age_h": 2.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 14:30:00",
    "lat": 37.45635,
    "lon": -141.87035,
    "alt_m": 12229.6
   },
   "member_spread_deg": {
    "lat": 22.61,
    "lon": 63.15
   },
   "member_spread_now_deg": {
    "lat": 0.16,
    "lon": 1.13
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-30",
   "flight_id": "DG2GG-30_2026-08-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 05:11:00",
   "seed_lat": 52.08333,
   "seed_lon": 135.45833,
   "seed_alt_m": 12450.0,
   "seed_age_h": 12.15,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 11:45:00",
    "lat": 70.46031,
    "lon": 14.28001,
    "alt_m": 11827.2
   },
   "member_spread_deg": {
    "lat": 20.37,
    "lon": 93.93
   },
   "member_spread_now_deg": {
    "lat": 3.17,
    "lon": 1.04
   },
   "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": 27.3,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 11:30:00",
    "lat": 35.72846,
    "lon": 50.47036,
    "alt_m": 13428.6
   },
   "member_spread_deg": {
    "lat": 23.39,
    "lon": 72.99
   },
   "member_spread_now_deg": {
    "lat": 3.91,
    "lon": 3.83
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 2.9,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 14:00:00",
    "lat": 57.59651,
    "lon": 93.1552,
    "alt_m": 12694.1
   },
   "member_spread_deg": {
    "lat": 20.46,
    "lon": 324.98
   },
   "member_spread_now_deg": {
    "lat": 1.93,
    "lon": 1.04
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 00:05:00",
   "seed_lat": 32.875,
   "seed_lon": -134.54167,
   "seed_alt_m": 13430.0,
   "seed_age_h": 17.25,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 11:30:00",
    "lat": 22.56834,
    "lon": -57.11987,
    "alt_m": 13667.6
   },
   "member_spread_deg": {
    "lat": 48.21,
    "lon": 69.87
   },
   "member_spread_now_deg": {
    "lat": 1.98,
    "lon": 13.67
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-36",
   "flight_id": "DG2GG-36_2026-09-26",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 11:05:00",
   "seed_lat": 38.95833,
   "seed_lon": 48.08333,
   "seed_alt_m": 13120.0,
   "seed_age_h": 6.25,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 11:30:00",
    "lat": 41.91843,
    "lon": -116.19109,
    "alt_m": 13299.4
   },
   "member_spread_deg": {
    "lat": 21.29,
    "lon": 92.01
   },
   "member_spread_now_deg": {
    "lat": 0.11,
    "lon": 3.19
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DH1PR-578",
   "flight_id": "DH1PR-578_2026-09-27",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 16:36:01",
   "seed_lat": 35.54167,
   "seed_lon": 18.33333,
   "seed_alt_m": 11610.0,
   "seed_age_h": 0.73,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-06 16:00:00",
    "lat": 54.08602,
    "lon": -114.99715,
    "alt_m": 11170.6
   },
   "member_spread_deg": {
    "lat": 6.66,
    "lon": 31.94
   },
   "member_spread_now_deg": {
    "lat": 0.03,
    "lon": 0.06
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DH1PR-578e",
   "flight_id": "DH1PR-578e_2026-09-27",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 16:37:32",
   "seed_lat": 35.54141,
   "seed_lon": 18.3408,
   "seed_alt_m": 11610.0,
   "seed_age_h": 0.71,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-06 16:15:00",
    "lat": 53.94372,
    "lon": -114.32746,
    "alt_m": 11156.7
   },
   "member_spread_deg": {
    "lat": 6.33,
    "lon": 30.4
   },
   "member_spread_now_deg": {
    "lat": 0.04,
    "lon": 0.06
   },
   "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": 268.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 11:45:00",
    "lat": 5.61182,
    "lon": -27.94556,
    "alt_m": 15322.5
   },
   "member_spread_deg": {
    "lat": 42.73,
    "lon": 260.92
   },
   "member_spread_now_deg": {
    "lat": 48.09,
    "lon": 126.98
   },
   "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": 273.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 11:30:00",
    "lat": 76.67928,
    "lon": 77.09619,
    "alt_m": 14006.1
   },
   "member_spread_deg": {
    "lat": 28.25,
    "lon": 319.28
   },
   "member_spread_now_deg": {
    "lat": 27.3,
    "lon": 68.48
   },
   "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": 244.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-06 11:45:00",
    "lat": 18.30046,
    "lon": -17.80591,
    "alt_m": 14357.9
   },
   "member_spread_deg": {
    "lat": 57.46,
    "lon": 212.42
   },
   "member_spread_now_deg": {
    "lat": 57.88,
    "lon": 311.57
   },
   "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": 69.64,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 11:45:00",
    "lat": 45.72474,
    "lon": 106.30317,
    "alt_m": 14376.7
   },
   "member_spread_deg": {
    "lat": 19.26,
    "lon": 113.48
   },
   "member_spread_now_deg": {
    "lat": 22.19,
    "lon": 41.72
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 14:35:30",
   "seed_lat": 39.125,
   "seed_lon": 15.33333,
   "seed_alt_m": 13350.0,
   "seed_age_h": 2.74,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 14:00:00",
    "lat": 44.0227,
    "lon": -158.58369,
    "alt_m": 12914.5
   },
   "member_spread_deg": {
    "lat": 13.46,
    "lon": 346.29
   },
   "member_spread_now_deg": {
    "lat": 0.37,
    "lon": 0.17
   },
   "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": 330.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-06 11:45:00",
    "lat": 51.43975,
    "lon": -109.59268,
    "alt_m": 13041.3
   },
   "member_spread_deg": {
    "lat": 33.69,
    "lon": 209.86
   },
   "member_spread_now_deg": {
    "lat": 31.82,
    "lon": 326.25
   },
   "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": 228.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-06 11:30:00",
    "lat": 42.47909,
    "lon": 114.73308,
    "alt_m": 12792.8
   },
   "member_spread_deg": {
    "lat": 35.02,
    "lon": 283.0
   },
   "member_spread_now_deg": {
    "lat": 22.98,
    "lon": 175.92
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
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 ]
}