{
 "generated_utc": "2026-07-30T17:28:14Z",
 "gfs_cycle_utc": "2026-07-30T12:00:00Z",
 "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_20260730_12Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260730_12Z.geojson.gz"
 },
 "counts": {
  "flights": 48,
  "members": 9,
  "rows": 250398
 },
 "flights": [
  {
   "callsign": "9A1CTF-16",
   "flight_id": "9A1CTF-16_2026-07-10",
   "payload_type": "WSPR",
   "seed_time": "2026-07-16 23:22:00",
   "seed_lat": 22.83333,
   "seed_lon": 138.79167,
   "seed_alt_m": 12180.0,
   "seed_age_h": 329.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-06 11:45:00",
    "lat": 31.25057,
    "lon": 61.65063,
    "alt_m": 12078.5
   },
   "member_spread_deg": {
    "lat": 76.73,
    "lon": 185.96
   },
   "member_spread_now_deg": {
    "lat": 74.86,
    "lon": 317.03
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "AE0SS-9",
   "flight_id": "AE0SS-9_2026-07-12",
   "payload_type": "APRS",
   "seed_time": "2026-07-19 01:40:35",
   "seed_lat": 33.85425,
   "seed_lon": -115.42858,
   "seed_alt_m": 14321.0,
   "seed_age_h": 279.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 11:45:00",
    "lat": 25.05002,
    "lon": -87.31595,
    "alt_m": 14327.6
   },
   "member_spread_deg": {
    "lat": 61.11,
    "lon": 120.12
   },
   "member_spread_now_deg": {
    "lat": 32.99,
    "lon": 51.09
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-07-30 04:28:40",
   "seed_lat": -63.27084,
   "seed_lon": 131.16668,
   "seed_alt_m": 12240.0,
   "seed_age_h": 12.86,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-06 11:30:00",
    "lat": -48.16473,
    "lon": 39.15145,
    "alt_m": 12316.9
   },
   "member_spread_deg": {
    "lat": 12.07,
    "lon": 97.24
   },
   "member_spread_now_deg": {
    "lat": 5.99,
    "lon": 6.01
   },
   "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": 143.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 11:45:00",
    "lat": 42.58964,
    "lon": -108.56549,
    "alt_m": 13368.9
   },
   "member_spread_deg": {
    "lat": 42.33,
    "lon": 336.19
   },
   "member_spread_now_deg": {
    "lat": 19.98,
    "lon": 76.35
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 12:50:18",
   "seed_lat": 56.52083,
   "seed_lon": 13.66667,
   "seed_alt_m": 12770.0,
   "seed_age_h": 28.5,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 11:45:00",
    "lat": 66.31617,
    "lon": 159.64018,
    "alt_m": 12879.5
   },
   "member_spread_deg": {
    "lat": 37.25,
    "lon": 351.82
   },
   "member_spread_now_deg": {
    "lat": 4.0,
    "lon": 5.8
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-07-30 17:01:33",
   "seed_lat": 46.375,
   "seed_lon": -59.66667,
   "seed_alt_m": 14100.0,
   "seed_age_h": 0.31,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-06 17:00:00",
    "lat": 41.4568,
    "lon": 9.43651,
    "alt_m": 14250.6
   },
   "member_spread_deg": {
    "lat": 22.97,
    "lon": 172.43
   },
   "member_spread_now_deg": {
    "lat": 0.23,
    "lon": 0.36
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-07-30 02:49:00",
   "seed_lat": 29.64583,
   "seed_lon": -162.625,
   "seed_alt_m": 13040.0,
   "seed_age_h": 14.52,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 11:45:00",
    "lat": 38.6077,
    "lon": -41.67383,
    "alt_m": 13038.4
   },
   "member_spread_deg": {
    "lat": 26.52,
    "lon": 107.42
   },
   "member_spread_now_deg": {
    "lat": 2.58,
    "lon": 2.19
   },
   "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": 129.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 11:45:00",
    "lat": 57.61537,
    "lon": -34.99001,
    "alt_m": 13181.6
   },
   "member_spread_deg": {
    "lat": 27.83,
    "lon": 266.35
   },
   "member_spread_now_deg": {
    "lat": 28.15,
    "lon": 324.36
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DG2GG-27",
   "flight_id": "DG2GG-27_2026-07-04",
   "payload_type": "WSPR",
   "seed_time": "2026-07-30 05:58:00",
   "seed_lat": 50.35417,
   "seed_lon": 151.79167,
   "seed_alt_m": 13390.0,
   "seed_age_h": 11.37,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 11:30:00",
    "lat": 47.95386,
    "lon": -135.76607,
    "alt_m": 13639.0
   },
   "member_spread_deg": {
    "lat": 36.45,
    "lon": 172.15
   },
   "member_spread_now_deg": {
    "lat": 0.55,
    "lon": 5.07
   },
   "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": 50.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-06 11:45:00",
    "lat": 43.06207,
    "lon": 38.06491,
    "alt_m": 9049.4
   },
   "member_spread_deg": {
    "lat": 48.07,
    "lon": 250.21
   },
   "member_spread_now_deg": {
    "lat": 9.68,
    "lon": 25.11
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 121.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-06 11:30:00",
    "lat": 44.44698,
    "lon": -113.47088,
    "alt_m": 8674.4
   },
   "member_spread_deg": {
    "lat": 35.63,
    "lon": 345.31
   },
   "member_spread_now_deg": {
    "lat": 24.5,
    "lon": 45.71
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "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": 33.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-06 11:30:00",
    "lat": 56.85399,
    "lon": 172.53434,
    "alt_m": 12397.5
   },
   "member_spread_deg": {
    "lat": 39.25,
    "lon": 337.65
   },
   "member_spread_now_deg": {
    "lat": 4.46,
    "lon": 30.61
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 33.88,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-06 11:30:00",
    "lat": 39.3087,
    "lon": -164.10292,
    "alt_m": 12475.8
   },
   "member_spread_deg": {
    "lat": 25.02,
    "lon": 109.16
   },
   "member_spread_now_deg": {
    "lat": 4.58,
    "lon": 30.31
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-07-30 16:43:00",
   "seed_lat": 60.10417,
   "seed_lon": 8.66667,
   "seed_alt_m": 12310.0,
   "seed_age_h": 0.62,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-06 16:15:00",
    "lat": 74.92704,
    "lon": -128.37164,
    "alt_m": 12341.6
   },
   "member_spread_deg": {
    "lat": 39.35,
    "lon": 306.29
   },
   "member_spread_now_deg": {
    "lat": 0.24,
    "lon": 0.41
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 149.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 11:45:00",
    "lat": 66.91703,
    "lon": -110.16959,
    "alt_m": 15058.1
   },
   "member_spread_deg": {
    "lat": 32.38,
    "lon": 265.02
   },
   "member_spread_now_deg": {
    "lat": 9.31,
    "lon": 304.17
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-30 05:43:00",
   "seed_lat": 76.0625,
   "seed_lon": 95.45833,
   "seed_alt_m": 12560.0,
   "seed_age_h": 11.62,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 11:45:00",
    "lat": 70.41083,
    "lon": -111.91291,
    "alt_m": 12694.5
   },
   "member_spread_deg": {
    "lat": 52.14,
    "lon": 79.88
   },
   "member_spread_now_deg": {
    "lat": 7.13,
    "lon": 16.85
   },
   "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": 173.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 11:45:00",
    "lat": 40.58229,
    "lon": -178.59794,
    "alt_m": 14196.3
   },
   "member_spread_deg": {
    "lat": 42.39,
    "lon": 348.44
   },
   "member_spread_now_deg": {
    "lat": 20.8,
    "lon": 307.33
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "K5NOT-11",
   "flight_id": "K5NOT-11_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-07-30 16:55:37",
   "seed_lat": 27.16661,
   "seed_lon": -22.125,
   "seed_alt_m": 13480.0,
   "seed_age_h": 0.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 17:00:00",
    "lat": 30.17702,
    "lon": 108.31599,
    "alt_m": 13260.4
   },
   "member_spread_deg": {
    "lat": 17.34,
    "lon": 140.6
   },
   "member_spread_now_deg": {
    "lat": 0.11,
    "lon": 0.15
   },
   "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": 82.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 11:30:00",
    "lat": 35.24348,
    "lon": 135.44068,
    "alt_m": 13154.1
   },
   "member_spread_deg": {
    "lat": 70.85,
    "lon": 323.86
   },
   "member_spread_now_deg": {
    "lat": 27.8,
    "lon": 349.86
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC3LBR-422-10",
   "flight_id": "KC3LBR-422-10_2026-01-02",
   "payload_type": "WSPR",
   "seed_time": "2026-07-19 21:57:02",
   "seed_lat": -26.39583,
   "seed_lon": -68.16667,
   "seed_alt_m": 14380.0,
   "seed_age_h": 259.38,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 11:30:00",
    "lat": -28.97092,
    "lon": 146.80968,
    "alt_m": 14325.3
   },
   "member_spread_deg": {
    "lat": 47.81,
    "lon": 301.74
   },
   "member_spread_now_deg": {
    "lat": 22.89,
    "lon": 280.62
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC3LBR-449",
   "flight_id": "KC3LBR-449_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-07-30 16:57:03",
   "seed_lat": 72.97917,
   "seed_lon": -164.33333,
   "seed_alt_m": 13150.0,
   "seed_age_h": 0.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 17:00:00",
    "lat": 59.97175,
    "lon": -84.04504,
    "alt_m": 13167.4
   },
   "member_spread_deg": {
    "lat": 28.01,
    "lon": 90.55
   },
   "member_spread_now_deg": {
    "lat": 0.13,
    "lon": 0.83
   },
   "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": 56.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 11:45:00",
    "lat": 65.41068,
    "lon": 100.92811,
    "alt_m": 13090.2
   },
   "member_spread_deg": {
    "lat": 21.28,
    "lon": 289.99
   },
   "member_spread_now_deg": {
    "lat": 22.39,
    "lon": 3.86
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KC5TRB-1",
   "flight_id": "KC5TRB-1_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-07-30 15:50:43",
   "seed_lat": 57.08328,
   "seed_lon": 7.00003,
   "seed_alt_m": 12720.0,
   "seed_age_h": 1.49,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-06 15:15:00",
    "lat": 79.43041,
    "lon": 155.55313,
    "alt_m": 12597.3
   },
   "member_spread_deg": {
    "lat": 54.0,
    "lon": 60.21
   },
   "member_spread_now_deg": {
    "lat": 0.71,
    "lon": 1.21
   },
   "display_as": "track",
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   "member_spread_deg": {
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    "lon": 160.4
   },
   "member_spread_now_deg": {
    "lat": 11.63,
    "lon": 348.38
   },
   "display_as": "region",
   "display_reason": "member_spread"
  }
 ]
}