{
 "generated_utc": "2026-09-30T23:27:29Z",
 "gfs_cycle_utc": "2026-09-30T18:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 466.0,
  "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_20260930_18Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260930_18Z.geojson.gz"
 },
 "counts": {
  "flights": 49,
  "members": 9,
  "rows": 200721
 },
 "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": 175.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 17:45:00",
    "lat": 36.66036,
    "lon": -64.63259,
    "alt_m": 13403.6
   },
   "member_spread_deg": {
    "lat": 26.44,
    "lon": 63.21
   },
   "member_spread_now_deg": {
    "lat": 22.98,
    "lon": 92.93
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "AE4ZZ-23",
   "flight_id": "AE4ZZ-23_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 10:51:41",
   "seed_lat": 38.10414,
   "seed_lon": 57.29167,
   "seed_alt_m": 13000.0,
   "seed_age_h": 12.47,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 17:45:00",
    "lat": 39.54207,
    "lon": -58.04062,
    "alt_m": 13203.6
   },
   "member_spread_deg": {
    "lat": 32.75,
    "lon": 72.74
   },
   "member_spread_now_deg": {
    "lat": 3.06,
    "lon": 4.27
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 22:43:40",
   "seed_lat": -64.4375,
   "seed_lon": 128.83334,
   "seed_alt_m": 12090.0,
   "seed_age_h": 0.61,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-07 22:45:00",
    "lat": -65.69197,
    "lon": 71.85429,
    "alt_m": 12014.3
   },
   "member_spread_deg": {
    "lat": 4.49,
    "lon": 208.01
   },
   "member_spread_now_deg": {
    "lat": 0.02,
    "lon": 0.2
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 20:22:48",
   "seed_lat": 36.1875,
   "seed_lon": -75.95833,
   "seed_alt_m": 13644.0,
   "seed_age_h": 2.95,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 20:00:00",
    "lat": 22.46445,
    "lon": -71.62182,
    "alt_m": 13988.3
   },
   "member_spread_deg": {
    "lat": 10.58,
    "lon": 65.45
   },
   "member_spread_now_deg": {
    "lat": 1.29,
    "lon": 1.5
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 18:47:18",
   "seed_lat": 30.58333,
   "seed_lon": -24.79167,
   "seed_alt_m": 13570.0,
   "seed_age_h": 4.55,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 18:15:00",
    "lat": 35.79999,
    "lon": 124.87894,
    "alt_m": 13063.7
   },
   "member_spread_deg": {
    "lat": 6.54,
    "lon": 19.08
   },
   "member_spread_now_deg": {
    "lat": 0.3,
    "lon": 0.7
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 19:00:48",
   "seed_lat": 57.95833,
   "seed_lon": -59.125,
   "seed_alt_m": 13400.0,
   "seed_age_h": 4.32,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 18:30:00",
    "lat": 46.44,
    "lon": 39.31075,
    "alt_m": 13804.8
   },
   "member_spread_deg": {
    "lat": 28.41,
    "lon": 187.9
   },
   "member_spread_now_deg": {
    "lat": 1.79,
    "lon": 2.93
   },
   "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": 255.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-07 17:30:00",
    "lat": 25.62765,
    "lon": -159.7859,
    "alt_m": 11430.6
   },
   "member_spread_deg": {
    "lat": 35.33,
    "lon": 323.05
   },
   "member_spread_now_deg": {
    "lat": 19.14,
    "lon": 275.44
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 14:03:54",
   "seed_lat": 25.04167,
   "seed_lon": 29.04167,
   "seed_alt_m": 12630.0,
   "seed_age_h": 9.27,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 17:30:00",
    "lat": 43.07494,
    "lon": -63.68902,
    "alt_m": 12329.7
   },
   "member_spread_deg": {
    "lat": 18.84,
    "lon": 68.13
   },
   "member_spread_now_deg": {
    "lat": 2.38,
    "lon": 2.25
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 13:40:32",
   "seed_lat": 24.96823,
   "seed_lon": 28.62083,
   "seed_alt_m": 12650.0,
   "seed_age_h": 9.66,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 17:45:00",
    "lat": 43.25107,
    "lon": -64.36825,
    "alt_m": 12340.5
   },
   "member_spread_deg": {
    "lat": 20.63,
    "lon": 66.8
   },
   "member_spread_now_deg": {
    "lat": 2.3,
    "lon": 2.13
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-30",
   "flight_id": "DG2GG-30_2026-08-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 22:06:00",
   "seed_lat": 54.0,
   "seed_lon": 170.91667,
   "seed_alt_m": 12130.0,
   "seed_age_h": 1.23,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-07 21:30:00",
    "lat": 47.89805,
    "lon": 2.29289,
    "alt_m": 12641.4
   },
   "member_spread_deg": {
    "lat": 28.22,
    "lon": 112.28
   },
   "member_spread_now_deg": {
    "lat": 0.07,
    "lon": 0.74
   },
   "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": 57.3,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 17:30:00",
    "lat": 28.62163,
    "lon": 33.59579,
    "alt_m": 13545.3
   },
   "member_spread_deg": {
    "lat": 24.21,
    "lon": 109.53
   },
   "member_spread_now_deg": {
    "lat": 11.87,
    "lon": 27.5
   },
   "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": 32.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 17:30:00",
    "lat": 47.73352,
    "lon": 77.56863,
    "alt_m": 13181.5
   },
   "member_spread_deg": {
    "lat": 36.47,
    "lon": 338.91
   },
   "member_spread_now_deg": {
    "lat": 14.97,
    "lon": 10.06
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 20:10:00",
   "seed_lat": 44.35417,
   "seed_lon": -95.0,
   "seed_alt_m": 13420.0,
   "seed_age_h": 3.17,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 19:45:00",
    "lat": 17.94924,
    "lon": -69.3606,
    "alt_m": 13710.7
   },
   "member_spread_deg": {
    "lat": 35.98,
    "lon": 70.59
   },
   "member_spread_now_deg": {
    "lat": 1.08,
    "lon": 1.92
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-36",
   "flight_id": "DG2GG-36_2026-09-26",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 10:35:00",
   "seed_lat": 40.9375,
   "seed_lon": 69.5,
   "seed_alt_m": 12990.0,
   "seed_age_h": 12.75,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 17:30:00",
    "lat": 44.30851,
    "lon": -128.75586,
    "alt_m": 13034.3
   },
   "member_spread_deg": {
    "lat": 18.7,
    "lon": 134.78
   },
   "member_spread_now_deg": {
    "lat": 0.84,
    "lon": 1.24
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DH1PR-578",
   "flight_id": "DH1PR-578_2026-09-27",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 15:45:46",
   "seed_lat": 36.41667,
   "seed_lon": 29.04167,
   "seed_alt_m": 11480.0,
   "seed_age_h": 7.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 17:45:00",
    "lat": 48.47536,
    "lon": -73.62807,
    "alt_m": 11347.8
   },
   "member_spread_deg": {
    "lat": 9.86,
    "lon": 16.99
   },
   "member_spread_now_deg": {
    "lat": 0.46,
    "lon": 1.82
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DH1PR-578e",
   "flight_id": "DH1PR-578e_2026-09-27",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 15:46:32",
   "seed_lat": 36.41737,
   "seed_lon": 29.04045,
   "seed_alt_m": 11480.0,
   "seed_age_h": 7.56,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 17:45:00",
    "lat": 48.47339,
    "lon": -73.6325,
    "alt_m": 11347.7
   },
   "member_spread_deg": {
    "lat": 9.86,
    "lon": 16.98
   },
   "member_spread_now_deg": {
    "lat": 0.46,
    "lon": 1.82
   },
   "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": 298.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 17:45:00",
    "lat": 2.85191,
    "lon": -58.37731,
    "alt_m": 15328.5
   },
   "member_spread_deg": {
    "lat": 54.36,
    "lon": 332.07
   },
   "member_spread_now_deg": {
    "lat": 46.87,
    "lon": 173.35
   },
   "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": 303.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 17:30:00",
    "lat": 76.09339,
    "lon": 88.09523,
    "alt_m": 14013.7
   },
   "member_spread_deg": {
    "lat": 37.23,
    "lon": 310.77
   },
   "member_spread_now_deg": {
    "lat": 32.08,
    "lon": 45.22
   },
   "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": 274.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-07 17:45:00",
    "lat": 23.03074,
    "lon": 1.92057,
    "alt_m": 14389.0
   },
   "member_spread_deg": {
    "lat": 54.09,
    "lon": 343.23
   },
   "member_spread_now_deg": {
    "lat": 58.44,
    "lon": 285.32
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DO3GU-8",
   "flight_id": "DO3GU-8_2026-08-12",
   "payload_type": "APRS",
   "seed_time": "2026-09-30 15:43:46",
   "seed_lat": 54.64466,
   "seed_lon": -1.98475,
   "seed_alt_m": 14350.0,
   "seed_age_h": 7.6,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 17:45:00",
    "lat": 65.07249,
    "lon": 171.01063,
    "alt_m": 13486.8
   },
   "member_spread_deg": {
    "lat": 16.26,
    "lon": 352.1
   },
   "member_spread_now_deg": {
    "lat": 5.93,
    "lon": 2.69
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 13:43:00",
   "seed_lat": 34.41667,
   "seed_lon": 25.91667,
   "seed_alt_m": 13160.0,
   "seed_age_h": 9.62,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 17:45:00",
    "lat": 45.035,
    "lon": -90.86555,
    "alt_m": 12925.7
   },
   "member_spread_deg": {
    "lat": 14.49,
    "lon": 77.51
   },
   "member_spread_now_deg": {
    "lat": 0.51,
    "lon": 0.77
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 258.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 17:30:00",
    "lat": 42.88257,
    "lon": 76.15648,
    "alt_m": 12987.7
   },
   "member_spread_deg": {
    "lat": 27.32,
    "lon": 334.04
   },
   "member_spread_now_deg": {
    "lat": 21.11,
    "lon": 156.26
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 16:45:45",
   "seed_lat": 50.99995,
   "seed_lon": -11.95831,
   "seed_alt_m": 13150.0,
   "seed_age_h": 6.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 17:45:00",
    "lat": 57.22048,
    "lon": -161.95234,
    "alt_m": 13041.5
   },
   "member_spread_deg": {
    "lat": 23.15,
    "lon": 337.6
   },
   "member_spread_now_deg": {
    "lat": 1.73,
    "lon": 0.35
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KJ4AWK-1",
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  }
 ]
}