{
 "generated_utc": "2026-09-23T17:28:08Z",
 "gfs_cycle_utc": "2026-09-23T12:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 486.0,
  "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_12Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260923_12Z.geojson.gz"
 },
 "counts": {
  "flights": 50,
  "members": 9,
  "rows": 213318
 },
 "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": 1.69,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 15:15:00",
    "lat": 41.8084,
    "lon": 80.84161,
    "alt_m": 13233.8
   },
   "member_spread_deg": {
    "lat": 30.77,
    "lon": 122.76
   },
   "member_spread_now_deg": {
    "lat": 0.23,
    "lon": 0.4
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AE4ZZ-23",
   "flight_id": "AE4ZZ-23_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 16:56:41",
   "seed_lat": 41.60414,
   "seed_lon": -38.87496,
   "seed_alt_m": 13530.0,
   "seed_age_h": 0.39,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 17:00:00",
    "lat": 46.14999,
    "lon": 59.04016,
    "alt_m": 12980.6
   },
   "member_spread_deg": {
    "lat": 34.55,
    "lon": 74.32
   },
   "member_spread_now_deg": {
    "lat": 0.16,
    "lon": 0.2
   },
   "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": 7.36,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 11:30:00",
    "lat": -76.41786,
    "lon": 13.81702,
    "alt_m": 12128.7
   },
   "member_spread_deg": {
    "lat": 21.82,
    "lon": 108.68
   },
   "member_spread_now_deg": {
    "lat": 1.39,
    "lon": 6.78
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AIRCOR-6",
   "flight_id": "AIRCOR-6_2026-09-14",
   "payload_type": "APRS",
   "seed_time": "2026-09-23 16:24:37",
   "seed_lat": 40.40309,
   "seed_lon": -104.83167,
   "seed_alt_m": 18386.0,
   "seed_age_h": 0.92,
   "float_reliable": false,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 16:00:00",
    "lat": 32.57551,
    "lon": -87.54324,
    "alt_m": 18568.2
   },
   "member_spread_deg": {
    "lat": 11.89,
    "lon": 43.76
   },
   "member_spread_now_deg": {
    "lat": 0.29,
    "lon": 0.63
   },
   "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": 20.8,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-30 11:30:00",
    "lat": 29.92084,
    "lon": -132.90381,
    "alt_m": 13747.8
   },
   "member_spread_deg": {
    "lat": 39.55,
    "lon": 327.82
   },
   "member_spread_now_deg": {
    "lat": 6.96,
    "lon": 11.6
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 16:53:18",
   "seed_lat": 42.54167,
   "seed_lon": -137.25,
   "seed_alt_m": 13130.0,
   "seed_age_h": 0.45,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 17:00:00",
    "lat": 28.82853,
    "lon": 10.2859,
    "alt_m": 13525.3
   },
   "member_spread_deg": {
    "lat": 34.93,
    "lon": 72.85
   },
   "member_spread_now_deg": {
    "lat": 0.11,
    "lon": 0.19
   },
   "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": 6.73,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-30 11:30:00",
    "lat": 58.6453,
    "lon": -72.05865,
    "alt_m": 13632.4
   },
   "member_spread_deg": {
    "lat": 17.95,
    "lon": 91.49
   },
   "member_spread_now_deg": {
    "lat": 0.16,
    "lon": 2.0
   },
   "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": 81.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-30 11:30:00",
    "lat": 42.26444,
    "lon": 172.62781,
    "alt_m": 11463.7
   },
   "member_spread_deg": {
    "lat": 40.99,
    "lon": 317.79
   },
   "member_spread_now_deg": {
    "lat": 16.75,
    "lon": 61.56
   },
   "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 02:33:46",
   "seed_lat": 50.125,
   "seed_lon": -166.08333,
   "seed_alt_m": 11920.0,
   "seed_age_h": 14.77,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-30 11:30:00",
    "lat": 46.33676,
    "lon": 24.3761,
    "alt_m": 12312.3
   },
   "member_spread_deg": {
    "lat": 40.87,
    "lon": 164.34
   },
   "member_spread_now_deg": {
    "lat": 4.08,
    "lon": 7.31
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 02:34:32",
   "seed_lat": 50.11823,
   "seed_lon": -166.07778,
   "seed_alt_m": 11920.0,
   "seed_age_h": 14.76,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-30 11:30:00",
    "lat": 46.33358,
    "lon": 24.36774,
    "alt_m": 12312.0
   },
   "member_spread_deg": {
    "lat": 40.96,
    "lon": 164.19
   },
   "member_spread_now_deg": {
    "lat": 4.08,
    "lon": 7.32
   },
   "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": 3.98,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 12:45:00",
    "lat": 48.64838,
    "lon": 171.42487,
    "alt_m": 12437.7
   },
   "member_spread_deg": {
    "lat": 26.54,
    "lon": 350.25
   },
   "member_spread_now_deg": {
    "lat": 1.88,
    "lon": 1.95
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-31",
   "flight_id": "DG2GG-31_2026-08-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 03:12:00",
   "seed_lat": 40.39583,
   "seed_lon": 128.04167,
   "seed_alt_m": 13150.0,
   "seed_age_h": 14.13,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 11:45:00",
    "lat": 42.85663,
    "lon": -45.54088,
    "alt_m": 13474.8
   },
   "member_spread_deg": {
    "lat": 46.94,
    "lon": 95.75
   },
   "member_spread_now_deg": {
    "lat": 1.86,
    "lon": 7.74
   },
   "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": 34.57,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 11:45:00",
    "lat": 58.09085,
    "lon": -35.16795,
    "alt_m": 12587.6
   },
   "member_spread_deg": {
    "lat": 22.2,
    "lon": 67.5
   },
   "member_spread_now_deg": {
    "lat": 3.21,
    "lon": 17.12
   },
   "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": 13.0,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 11:45:00",
    "lat": 28.07366,
    "lon": -135.80375,
    "alt_m": 13483.2
   },
   "member_spread_deg": {
    "lat": 50.36,
    "lon": 255.53
   },
   "member_spread_now_deg": {
    "lat": 1.3,
    "lon": 4.5
   },
   "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": 124.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 11:45:00",
    "lat": 2.4383,
    "lon": -42.09775,
    "alt_m": 15330.6
   },
   "member_spread_deg": {
    "lat": 51.95,
    "lon": 138.83
   },
   "member_spread_now_deg": {
    "lat": 26.71,
    "lon": 41.74
   },
   "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": 129.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 11:30:00",
    "lat": 45.75639,
    "lon": -3.99824,
    "alt_m": 14599.0
   },
   "member_spread_deg": {
    "lat": 31.4,
    "lon": 74.06
   },
   "member_spread_now_deg": {
    "lat": 9.3,
    "lon": 45.29
   },
   "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": 100.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-30 11:45:00",
    "lat": 39.38414,
    "lon": -127.67676,
    "alt_m": 14140.6
   },
   "member_spread_deg": {
    "lat": 53.6,
    "lon": 294.61
   },
   "member_spread_now_deg": {
    "lat": 23.7,
    "lon": 351.78
   },
   "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": 129.1,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 11:45:00",
    "lat": 39.53245,
    "lon": -8.95669,
    "alt_m": 14547.8
   },
   "member_spread_deg": {
    "lat": 29.82,
    "lon": 125.36
   },
   "member_spread_now_deg": {
    "lat": 3.02,
    "lon": 59.18
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 16:23:00",
   "seed_lat": 42.95833,
   "seed_lon": -58.25,
   "seed_alt_m": 13430.0,
   "seed_age_h": 0.95,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 16:00:00",
    "lat": 59.25621,
    "lon": 178.82907,
    "alt_m": 12570.8
   },
   "member_spread_deg": {
    "lat": 24.86,
    "lon": 330.75
   },
   "member_spread_now_deg": {
    "lat": 0.37,
    "lon": 1.14
   },
   "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": 323.92,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-30 11:30:00",
    "lat": 30.05973,
    "lon": -51.75296,
    "alt_m": 12826.1
   },
   "member_spread_deg": {
    "lat": 59.48,
    "lon": 245.9
   },
   "member_spread_now_deg": {
    "lat": 48.37,
    "lon": 238.21
   },
   "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": 186.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 11:45:00",
    "lat": 15.78453,
    "lon": 20.95747,
    "alt_m": 13911.5
   },
   "member_spread_deg": {
    "lat": 36.67,
    "lon": 323.13
   },
   "member_spread_now_deg": {
    "lat": 21.63,
    "lon": 99.98
   },
   "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": 84.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 11:30:00",
    "lat": 46.69486,
    "lon": -25.49561,
    "alt_m": 12924.9
   },
   "member_spread_deg": {
    "lat": 37.45,
    "lon": 169.37
   },
   "member_spread_now_deg": {
    "lat": 10.53,
    "lon": 39.82
   },
   "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": 275.25,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 11:30:00",
    "lat": 54.98319,
    "lon": -98.86786,
    "alt_m": 12112.1
   },
   "member_spread_deg": {
    "lat": 34.36,
    "lon": 344.48
   },
   "member_spread_now_deg": {
    "lat": 39.03,
    "lon": 186.34
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KE8RES-8",
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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": 4.74,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-30 12:00:00",
    "lat": 25.95074,
    "lon": 134.94924,
    "alt_m": 13144.1
   },
   "member_spread_deg": {
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   },
   "member_spread_now_deg": {
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   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "ZS6WBT-1",
   "flight_id": "ZS6WBT-1_2026-08-19",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 05:51:00",
   "seed_lat": -13.66667,
   "seed_lon": 161.33333,
   "seed_alt_m": 15970.0,
   "seed_age_h": 11.48,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-30 11:45:00",
    "lat": -30.91434,
    "lon": -77.46948,
    "alt_m": 15409.5
   },
   "member_spread_deg": {
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   },
   "member_spread_now_deg": {
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    "lon": 1.68
   },
   "display_as": "track",
   "display_reason": "fresh"
  }
 ]
}