{
 "generated_utc": "2026-08-06T11:27:42Z",
 "gfs_cycle_utc": "2026-08-06T06:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 497.5,
  "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_20260806_06Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260806_06Z.geojson.gz"
 },
 "counts": {
  "flights": 36,
  "members": 9,
  "rows": 185184
 },
 "flights": [
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 10:53:40",
   "seed_lat": -41.75,
   "seed_lon": 21.33335,
   "seed_alt_m": 12630.0,
   "seed_age_h": 0.44,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 11:00:00",
    "lat": -66.17939,
    "lon": -83.8024,
    "alt_m": 13076.2
   },
   "member_spread_deg": {
    "lat": 29.58,
    "lon": 85.87
   },
   "member_spread_now_deg": {
    "lat": 0.03,
    "lon": 0.08
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-24 17:39:48",
   "seed_lat": 59.97917,
   "seed_lon": 4.08333,
   "seed_alt_m": 13000.0,
   "seed_age_h": 305.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 05:45:00",
    "lat": 50.46392,
    "lon": -97.37889,
    "alt_m": 12982.2
   },
   "member_spread_deg": {
    "lat": 34.46,
    "lon": 261.96
   },
   "member_spread_now_deg": {
    "lat": 56.2,
    "lon": 334.54
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 02:18:49",
   "seed_lat": 65.10417,
   "seed_lon": -125.75,
   "seed_alt_m": 12940.0,
   "seed_age_h": 9.02,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 05:45:00",
    "lat": 65.43521,
    "lon": -4.58877,
    "alt_m": 12492.3
   },
   "member_spread_deg": {
    "lat": 17.4,
    "lon": 187.39
   },
   "member_spread_now_deg": {
    "lat": 5.9,
    "lon": 7.11
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 09:15:03",
   "seed_lat": 58.04167,
   "seed_lon": 26.125,
   "seed_alt_m": 13940.0,
   "seed_age_h": 2.08,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-13 08:45:00",
    "lat": 45.74612,
    "lon": 162.54446,
    "alt_m": 14177.9
   },
   "member_spread_deg": {
    "lat": 20.19,
    "lon": 339.67
   },
   "member_spread_now_deg": {
    "lat": 0.37,
    "lon": 1.63
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 02:49:00",
   "seed_lat": 32.41667,
   "seed_lon": -153.20833,
   "seed_alt_m": 13120.0,
   "seed_age_h": 8.52,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 05:45:00",
    "lat": 54.66518,
    "lon": 11.88393,
    "alt_m": 12932.3
   },
   "member_spread_deg": {
    "lat": 26.15,
    "lon": 131.18
   },
   "member_spread_now_deg": {
    "lat": 0.7,
    "lon": 3.77
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-25",
   "flight_id": "DG2GG-25_2026-06-15",
   "payload_type": "WSPR",
   "seed_time": "2026-07-25 07:22:00",
   "seed_lat": 68.97917,
   "seed_lon": 68.16667,
   "seed_alt_m": 12990.0,
   "seed_age_h": 291.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 05:45:00",
    "lat": 83.32508,
    "lon": 43.27558,
    "alt_m": 12459.5
   },
   "member_spread_deg": {
    "lat": 49.99,
    "lon": 324.3
   },
   "member_spread_now_deg": {
    "lat": 33.97,
    "lon": 209.91
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DG2GG-27",
   "flight_id": "DG2GG-27_2026-07-04",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 00:03:00",
   "seed_lat": 47.41667,
   "seed_lon": -119.875,
   "seed_alt_m": 13670.0,
   "seed_age_h": 11.28,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 05:30:00",
    "lat": 22.25731,
    "lon": -127.11276,
    "alt_m": 14059.4
   },
   "member_spread_deg": {
    "lat": 26.63,
    "lon": 72.91
   },
   "member_spread_now_deg": {
    "lat": 3.47,
    "lon": 5.06
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-29",
   "flight_id": "DG2GG-29_2026-07-28",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 04:57:00",
   "seed_lat": 46.91667,
   "seed_lon": 165.25,
   "seed_alt_m": 13380.0,
   "seed_age_h": 54.38,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 05:30:00",
    "lat": 44.16434,
    "lon": -48.99473,
    "alt_m": 13472.2
   },
   "member_spread_deg": {
    "lat": 75.25,
    "lon": 308.07
   },
   "member_spread_now_deg": {
    "lat": 19.64,
    "lon": 18.91
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DJ2DS-34",
   "flight_id": "DJ2DS-34_2026-04-22",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 14:41:00",
   "seed_lat": 30.70833,
   "seed_lon": -70.5,
   "seed_alt_m": 9190.0,
   "seed_age_h": 212.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-13 05:45:00",
    "lat": 39.72635,
    "lon": 78.96625,
    "alt_m": 9095.0
   },
   "member_spread_deg": {
    "lat": 37.93,
    "lon": 332.85
   },
   "member_spread_now_deg": {
    "lat": 47.03,
    "lon": 145.28
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DL0MMZ",
   "flight_id": "DL0MMZ_2026-07-24",
   "payload_type": "OTHER",
   "seed_time": "2026-07-25 15:59:04",
   "seed_lat": 36.60802,
   "seed_lon": 30.46457,
   "seed_alt_m": 8441.0,
   "seed_age_h": 283.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-13 05:30:00",
    "lat": 55.5308,
    "lon": 13.10587,
    "alt_m": 8703.7
   },
   "member_spread_deg": {
    "lat": 24.37,
    "lon": 322.23
   },
   "member_spread_now_deg": {
    "lat": 50.67,
    "lon": 325.63
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DL0MZ-493",
   "flight_id": "DL0MZ-493_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 07:36:01",
   "seed_lat": 64.20833,
   "seed_lon": 58.16667,
   "seed_alt_m": 12170.0,
   "seed_age_h": 195.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-13 05:30:00",
    "lat": 63.69068,
    "lon": -10.43332,
    "alt_m": 11966.1
   },
   "member_spread_deg": {
    "lat": 27.37,
    "lon": 253.74
   },
   "member_spread_now_deg": {
    "lat": 34.19,
    "lon": 99.35
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DL0MZ-493e",
   "flight_id": "DL0MZ-493e_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 07:27:02",
   "seed_lat": 64.15625,
   "seed_lon": 58.08889,
   "seed_alt_m": 12170.0,
   "seed_age_h": 195.88,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-13 05:30:00",
    "lat": 29.91805,
    "lon": -42.30924,
    "alt_m": 12746.5
   },
   "member_spread_deg": {
    "lat": 34.82,
    "lon": 185.43
   },
   "member_spread_now_deg": {
    "lat": 41.0,
    "lon": 53.57
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 05:38:00",
   "seed_lat": 85.95833,
   "seed_lon": -162.29167,
   "seed_alt_m": 12000.0,
   "seed_age_h": 5.7,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-13 05:45:00",
    "lat": 62.21583,
    "lon": 108.59401,
    "alt_m": 12150.4
   },
   "member_spread_deg": {
    "lat": 21.58,
    "lon": 232.35
   },
   "member_spread_now_deg": {
    "lat": 2.32,
    "lon": 78.77
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DO3GU-40",
   "flight_id": "DO3GU-40_2026-06-19",
   "payload_type": "WSPR",
   "seed_time": "2026-07-24 12:15:47",
   "seed_lat": 71.20833,
   "seed_lon": 93.16667,
   "seed_alt_m": 15164.0,
   "seed_age_h": 311.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 05:45:00",
    "lat": 67.59286,
    "lon": -108.93406,
    "alt_m": 15171.8
   },
   "member_spread_deg": {
    "lat": 23.59,
    "lon": 351.97
   },
   "member_spread_now_deg": {
    "lat": 21.21,
    "lon": 339.73
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 02:08:00",
   "seed_lat": 65.45833,
   "seed_lon": -130.45833,
   "seed_alt_m": 13220.0,
   "seed_age_h": 9.2,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 05:45:00",
    "lat": 69.9216,
    "lon": -144.34827,
    "alt_m": 12878.3
   },
   "member_spread_deg": {
    "lat": 23.1,
    "lon": 117.45
   },
   "member_spread_now_deg": {
    "lat": 3.02,
    "lon": 2.17
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "K0PEA-28",
   "flight_id": "K0PEA-28_2026-01-07",
   "payload_type": "WSPR",
   "seed_time": "2026-07-23 12:15:25",
   "seed_lat": 49.85411,
   "seed_lon": 24.91668,
   "seed_alt_m": 13360.0,
   "seed_age_h": 335.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 05:45:00",
    "lat": 55.97527,
    "lon": -18.18564,
    "alt_m": 13478.0
   },
   "member_spread_deg": {
    "lat": 85.31,
    "lon": 336.49
   },
   "member_spread_now_deg": {
    "lat": 64.66,
    "lon": 346.54
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "K5NOT-11",
   "flight_id": "K5NOT-11_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 07:15:37",
   "seed_lat": 53.91661,
   "seed_lon": 105.08333,
   "seed_alt_m": 13060.0,
   "seed_age_h": 4.07,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 06:45:00",
    "lat": 36.52146,
    "lon": -140.67261,
    "alt_m": 13405.3
   },
   "member_spread_deg": {
    "lat": 63.51,
    "lon": 350.27
   },
   "member_spread_now_deg": {
    "lat": 1.07,
    "lon": 2.01
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "K9YO-23",
   "flight_id": "K9YO-23_2026-07-13",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 06:25:49",
   "seed_lat": 52.5833,
   "seed_lon": 125.16663,
   "seed_alt_m": 12840.0,
   "seed_age_h": 244.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 05:30:00",
    "lat": 35.98006,
    "lon": 174.56755,
    "alt_m": 13072.7
   },
   "member_spread_deg": {
    "lat": 55.4,
    "lon": 350.01
   },
   "member_spread_now_deg": {
    "lat": 69.58,
    "lon": 289.43
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC3LBR-449",
   "flight_id": "KC3LBR-449_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 10:57:03",
   "seed_lat": 52.9375,
   "seed_lon": -82.04167,
   "seed_alt_m": 13320.0,
   "seed_age_h": 0.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 11:00:00",
    "lat": 64.75065,
    "lon": -13.65873,
    "alt_m": 13160.5
   },
   "member_spread_deg": {
    "lat": 9.4,
    "lon": 53.18
   },
   "member_spread_now_deg": {
    "lat": 0.05,
    "lon": 0.27
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KC3LBR-485",
   "flight_id": "KC3LBR-485_2026-03-19",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 09:08:18",
   "seed_lat": 50.14583,
   "seed_lon": 23.375,
   "seed_alt_m": 12850.0,
   "seed_age_h": 218.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 05:45:00",
    "lat": 53.56476,
    "lon": -109.62008,
    "alt_m": 13090.8
   },
   "member_spread_deg": {
    "lat": 35.1,
    "lon": 253.49
   },
   "member_spread_now_deg": {
    "lat": 22.98,
    "lon": 294.08
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC5TRB-1",
   "flight_id": "KC5TRB-1_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 01:55:43",
   "seed_lat": 77.04161,
   "seed_lon": 175.7917,
   "seed_alt_m": 12360.0,
   "seed_age_h": 9.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-13 05:30:00",
    "lat": 80.04602,
    "lon": 90.05965,
    "alt_m": 12564.8
   },
   "member_spread_deg": {
    "lat": 23.4,
    "lon": 298.08
   },
   "member_spread_now_deg": {
    "lat": 7.96,
    "lon": 151.13
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KD7FXO-1",
   "flight_id": "KD7FXO-1_2026-08-02",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 01:25:00",
   "seed_lat": 43.47917,
   "seed_lon": -105.08333,
   "seed_alt_m": 12790.0,
   "seed_age_h": 9.92,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 05:30:00",
    "lat": 70.25499,
    "lon": 82.59003,
    "alt_m": 12392.8
   },
   "member_spread_deg": {
    "lat": 28.5,
    "lon": 59.8
   },
   "member_spread_now_deg": {
    "lat": 1.95,
    "lon": 3.66
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KE8RES-8",
   "flight_id": "KE8RES-8_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 23:31:00",
   "seed_lat": 58.5625,
   "seed_lon": -82.5,
   "seed_alt_m": 12030.0,
   "seed_age_h": 11.82,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-13 05:30:00",
    "lat": 49.55352,
    "lon": -86.8516,
    "alt_m": 12149.5
   },
   "member_spread_deg": {
    "lat": 11.03,
    "lon": 48.29
   },
   "member_spread_now_deg": {
    "lat": 1.59,
    "lon": 3.93
   },
   "display_as": "track",
   "display_reason": "fresh"
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  },
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  },
  {
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  },
  {
   "callsign": "PC4L-11",
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   "seed_time": "2026-07-26 12:46:26",
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   "display_as": "region",
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  },
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  },
  {
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   "display_as": "track",
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  },
  {
   "callsign": "SP6MPL-34",
   "flight_id": "SP6MPL-34_2025-12-03",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 18:52:00",
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   "display_as": "region",
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  },
  {
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  },
  {
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  },
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  {
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  },
  {
   "callsign": "ZS6SRC-37",
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   "seed_time": "2026-07-31 04:34:00",
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  },
  {
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   "payload_type": "WSPR",
   "seed_time": "2026-07-27 15:20:00",
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  }
 ]
}