diff --git a/docs/algo-reports/2026-08-01-full-recalibration.md b/docs/algo-reports/2026-08-01-full-recalibration.md
new file mode 100644
index 00000000..885a0f54
--- /dev/null
+++ b/docs/algo-reports/2026-08-01-full-recalibration.md
@@ -0,0 +1,65 @@
+# Full Recalibration Report — 2026-08-01
+
+> Auto-generated by `scripts/recalibrate.py`. The companion JSON file at `priv/algo/band_weights.json` is the machine-readable output that Elixir loads at runtime. This report is the human-readable audit trail.
+
+Connection: `postgres://prop:***@10.0.19.30:6432/prop`
+Generated: `2026-08-01T21:30:41+00:00`
+
+## Data sources
+
+- **PSKR** (VHF/UHF, label = `spot_count`): bands [50, 144, 432, 1296, 2304, 3400, 10000], 1,726,757 samples
+- **Contacts ↔ HRRR** (microwave, label = `distance_km`): 12 bands, 74,072 matched contacts
+
+## Per-band evidence
+
+| Band | Source | n | label avg | ρ_tc | ρ_dpc | ρ_pr | ρ_pwat | ρ_grad |
+|------|--------|---:|----------:|-----:|------:|-----:|-------:|-------:|
+| 50 MHz | pskr | 1,633,976 | 2.24 | +0.113 | +0.102 | +0.044 | +0.114 | -0.033 |
+| 144 MHz | pskr | 87,724 | 3.07 | +0.057 | +0.101 | +0.140 | +0.117 | +0.004 |
+| 222 MHz | contacts | 7,517 | 229.17 | -0.082 | +0.078 | -0.012 | +0.069 | +0.041 |
+| 432 MHz | pskr | 4,152 | 1.62 | +0.094 | -0.205 | +0.123 | -0.188 | +0.207 |
+| 902 MHz | contacts | 1,753 | 172.23 | -0.070 | +0.094 | +0.077 | +0.047 | -0.041 |
+| 1296 MHz | contacts | 2,951 | 160.98 | -0.035 | +0.100 | +0.023 | +0.052 | -0.072 |
+| 2304 MHz | contacts | 718 | 154.72 | -0.053 | +0.169 | +0.082 | +0.128 | -0.094 |
+| 3400 MHz | contacts | 334 | 154.14 | -0.052 | +0.149 | -0.025 | +0.145 | +0.076 |
+| 5760 MHz | contacts | 320 | 127.92 | -0.058 | +0.071 | +0.151 | +0.097 | -0.020 |
+| 10000 MHz | contacts | 47,260 | 208.25 | -0.001 | -0.024 | -0.089 | -0.029 | +0.030 |
+| 24000 MHz | contacts | 3,330 | 95.36 | -0.215 | -0.333 | -0.204 | -0.366 | +0.005 |
+| 47000 MHz | contacts | 661 | 62.80 | -0.121 | -0.187 | -0.246 | -0.220 | -0.027 |
+| 75000 MHz | contacts | 93 | 49.90 | -0.688 | -0.696 | -0.774 | -0.636 | +0.495 |
+| 122000 MHz | contacts | 63 | 16.26 | +0.038 | -0.130 | -0.042 | -0.128 | +0.356 |
+
+## Derived per-band weights
+
+| Band | n | source | humidity | time_of_day | td_depression | refractivity | sky | season | wind | rain | pwat | pressure |
+|------|---:|--------|----:|----:|----:|----:|----:|----:|----:|----:|----:|----:|
+| 50 MHz | 1,633,976 | pskr | 0.2039 | 0.0184 | 0.1632 | 0.0823 | 0.0679 | 0.1466 | 0.0679 | 0.0116 | 0.1853 | 0.0528 |
+| 144 MHz | 87,724 | pskr | 0.2020 | 0.0213 | 0.1617 | 0.0527 | 0.0673 | 0.1271 | 0.0673 | 0.0115 | 0.1836 | 0.1055 |
+| 222 MHz | 7,517 | contacts | 0.1947 | 0.0273 | 0.1815 | 0.1000 | 0.0756 | 0.1325 | 0.0756 | 0.0129 | 0.1565 | 0.0434 |
+| 432 MHz | 4,152 | pskr | 0.1869 | 0.0225 | 0.1496 | 0.1460 | 0.0623 | 0.1008 | 0.0623 | 0.0106 | 0.1699 | 0.0892 |
+| 902 MHz | 1,753 | contacts | 0.2167 | 0.0302 | 0.1787 | 0.0988 | 0.0744 | 0.1103 | 0.0744 | 0.0127 | 0.1256 | 0.0782 |
+| 1296 MHz | 2,951 | contacts | 0.2289 | 0.0345 | 0.1510 | 0.1361 | 0.0763 | 0.1029 | 0.0763 | 0.0130 | 0.1350 | 0.0462 |
+| 2304 MHz | 718 | contacts | 0.1916 | 0.0289 | 0.1530 | 0.1344 | 0.0639 | 0.0861 | 0.0639 | 0.0344 | 0.1742 | 0.0698 |
+| 3400 MHz | 334 | contacts | 0.1983 | 0.0298 | 0.1574 | 0.1217 | 0.0661 | 0.0891 | 0.0661 | 0.0503 | 0.1802 | 0.0411 |
+| 5760 MHz | 320 | contacts | 0.1621 | 0.0299 | 0.1591 | 0.0676 | 0.0662 | 0.0893 | 0.0662 | 0.0797 | 0.1696 | 0.1101 |
+| 10000 MHz | 47,260 | contacts | 0.1262 | 0.0380 | 0.1010 | 0.0986 | 0.0841 | 0.1134 | 0.0841 | 0.1431 | 0.1147 | 0.0967 |
+| 24000 MHz | 3,330 | contacts | 0.1514 | 0.0410 | 0.1211 | 0.0402 | 0.0504 | 0.0748 | 0.0504 | 0.2270 | 0.1376 | 0.1061 |
+| 47000 MHz | 661 | contacts | 0.1402 | 0.0528 | 0.1122 | 0.0522 | 0.0467 | 0.0756 | 0.0467 | 0.2385 | 0.1275 | 0.1075 |
+
+## Changes vs prior `band_weights.json`
+
+Largest weight moves (≥0.5 pp), sorted by magnitude:
+
+| Band | Factor | Prior | New | Δ |
+|------|--------|------:|----:|--:|
+| 47000 MHz | refractivity | 0.0688 | 0.0522 | -0.0166 |
+| 3400 MHz | refractivity | 0.1090 | 0.1217 | +0.0127 |
+| 2304 MHz | refractivity | 0.1439 | 0.1344 | -0.0095 |
+| 5760 MHz | refractivity | 0.0764 | 0.0676 | -0.0088 |
+| 24000 MHz | refractivity | 0.0453 | 0.0402 | -0.0051 |
+
+## Applying these weights
+
+These weights are **live scoring inputs, not documentation**. `BandConfig.weights/1` consults `BandWeights.lookup/1` (which reads this JSON) *before* falling back to the in-source `:weights` override or the global `@weights` default. This script still never edits `band_config.ex` — it only rewrites the JSON.
+
+`BandWeights` caches the parsed file in `:persistent_term` on first read, so a running node keeps serving the *previous* weights until it restarts. To put this run into effect, deploy (the file ships under `priv/`) or call `BandWeights.reset/0` on every node.
diff --git a/priv/algo/band_weights.json b/priv/algo/band_weights.json
index d00d85ad..b50904d1 100644
--- a/priv/algo/band_weights.json
+++ b/priv/algo/band_weights.json
@@ -1,5 +1,5 @@
 {
-  "generated_at": "2026-05-25T19:44:49+00:00",
+  "generated_at": "2026-08-01T21:30:41+00:00",
   "generated_by": "scripts/recalibrate.py",
   "schema_version": 1,
   "global_weights": {
@@ -22,9 +22,10 @@
         432,
         1296,
         2304,
+        3400,
         10000
       ],
-      "total_samples": 411619
+      "total_samples": 1726757
     },
     "contacts": {
       "bands": [
@@ -41,152 +42,152 @@
         75000,
         122000
       ],
-      "total_samples": 81571
+      "total_samples": 74072
     }
   },
   "band_overrides": {
     "50": {
       "weights": {
-        "humidity": 0.1252,
-        "time_of_day": 0.0273,
-        "td_depression": 0.1511,
-        "refractivity": 0.0764,
-        "sky": 0.1006,
-        "season": 0.2171,
-        "wind": 0.1006,
-        "rain": 0.0171,
-        "pwat": 0.1197,
-        "pressure": 0.0649
+        "humidity": 0.2039,
+        "time_of_day": 0.0184,
+        "td_depression": 0.1632,
+        "refractivity": 0.0823,
+        "sky": 0.0679,
+        "season": 0.1466,
+        "wind": 0.0679,
+        "rain": 0.0116,
+        "pwat": 0.1853,
+        "pressure": 0.0528
       },
-      "n_samples": 396474,
+      "n_samples": 1633976,
       "source": "pskr"
     },
     "144": {
       "weights": {
-        "humidity": 0.1865,
-        "time_of_day": 0.0197,
-        "td_depression": 0.1492,
-        "refractivity": 0.1106,
-        "sky": 0.0621,
-        "season": 0.1173,
-        "wind": 0.0621,
-        "rain": 0.0106,
-        "pwat": 0.1695,
-        "pressure": 0.1125
+        "humidity": 0.202,
+        "time_of_day": 0.0213,
+        "td_depression": 0.1617,
+        "refractivity": 0.0527,
+        "sky": 0.0673,
+        "season": 0.1271,
+        "wind": 0.0673,
+        "rain": 0.0115,
+        "pwat": 0.1836,
+        "pressure": 0.1055
       },
-      "n_samples": 13710,
+      "n_samples": 87724,
       "source": "pskr"
     },
     "222": {
       "weights": {
-        "humidity": 0.2002,
-        "time_of_day": 0.0271,
-        "td_depression": 0.1804,
-        "refractivity": 0.101,
-        "sky": 0.0751,
-        "season": 0.1316,
-        "wind": 0.0751,
-        "rain": 0.0128,
-        "pwat": 0.1535,
-        "pressure": 0.0432
+        "humidity": 0.1947,
+        "time_of_day": 0.0273,
+        "td_depression": 0.1815,
+        "refractivity": 0.1,
+        "sky": 0.0756,
+        "season": 0.1325,
+        "wind": 0.0756,
+        "rain": 0.0129,
+        "pwat": 0.1565,
+        "pressure": 0.0434
       },
-      "n_samples": 7518,
+      "n_samples": 7517,
       "source": "contacts"
     },
     "432": {
       "weights": {
-        "humidity": 0.153,
-        "time_of_day": 0.0256,
-        "td_depression": 0.17,
-        "refractivity": 0.1659,
-        "sky": 0.0708,
-        "season": 0.1145,
-        "wind": 0.0708,
-        "rain": 0.012,
-        "pwat": 0.1376,
-        "pressure": 0.0799
+        "humidity": 0.1869,
+        "time_of_day": 0.0225,
+        "td_depression": 0.1496,
+        "refractivity": 0.146,
+        "sky": 0.0623,
+        "season": 0.1008,
+        "wind": 0.0623,
+        "rain": 0.0106,
+        "pwat": 0.1699,
+        "pressure": 0.0892
       },
-      "n_samples": 1013,
+      "n_samples": 4152,
       "source": "pskr"
     },
     "902": {
       "weights": {
-        "humidity": 0.2204,
-        "time_of_day": 0.0299,
-        "td_depression": 0.1764,
-        "refractivity": 0.0967,
-        "sky": 0.0734,
-        "season": 0.1089,
-        "wind": 0.0734,
-        "rain": 0.0125,
-        "pwat": 0.1273,
-        "pressure": 0.081
+        "humidity": 0.2167,
+        "time_of_day": 0.0302,
+        "td_depression": 0.1787,
+        "refractivity": 0.0988,
+        "sky": 0.0744,
+        "season": 0.1103,
+        "wind": 0.0744,
+        "rain": 0.0127,
+        "pwat": 0.1256,
+        "pressure": 0.0782
       },
-      "n_samples": 1754,
+      "n_samples": 1753,
       "source": "contacts"
     },
     "1296": {
       "weights": {
-        "humidity": 0.2259,
-        "time_of_day": 0.034,
-        "td_depression": 0.1528,
-        "refractivity": 0.1429,
-        "sky": 0.0753,
-        "season": 0.1015,
-        "wind": 0.0753,
-        "rain": 0.0128,
-        "pwat": 0.1327,
-        "pressure": 0.0468
+        "humidity": 0.2289,
+        "time_of_day": 0.0345,
+        "td_depression": 0.151,
+        "refractivity": 0.1361,
+        "sky": 0.0763,
+        "season": 0.1029,
+        "wind": 0.0763,
+        "rain": 0.013,
+        "pwat": 0.135,
+        "pressure": 0.0462
       },
       "n_samples": 2951,
       "source": "contacts"
     },
     "2304": {
       "weights": {
-        "humidity": 0.1886,
-        "time_of_day": 0.0284,
-        "td_depression": 0.1503,
-        "refractivity": 0.1474,
-        "sky": 0.0629,
-        "season": 0.0848,
-        "wind": 0.0629,
-        "rain": 0.0338,
-        "pwat": 0.1714,
-        "pressure": 0.0695
+        "humidity": 0.1916,
+        "time_of_day": 0.0289,
+        "td_depression": 0.153,
+        "refractivity": 0.1344,
+        "sky": 0.0639,
+        "season": 0.0861,
+        "wind": 0.0639,
+        "rain": 0.0344,
+        "pwat": 0.1742,
+        "pressure": 0.0698
       },
-      "n_samples": 719,
+      "n_samples": 718,
       "source": "contacts"
     },
     "3400": {
       "weights": {
-        "humidity": 0.2001,
-        "time_of_day": 0.0301,
-        "td_depression": 0.1601,
-        "refractivity": 0.1102,
-        "sky": 0.0667,
-        "season": 0.0899,
-        "wind": 0.0667,
-        "rain": 0.0507,
-        "pwat": 0.1818,
-        "pressure": 0.0437
+        "humidity": 0.1983,
+        "time_of_day": 0.0298,
+        "td_depression": 0.1574,
+        "refractivity": 0.1217,
+        "sky": 0.0661,
+        "season": 0.0891,
+        "wind": 0.0661,
+        "rain": 0.0503,
+        "pwat": 0.1802,
+        "pressure": 0.0411
       },
-      "n_samples": 335,
+      "n_samples": 334,
       "source": "contacts"
     },
     "5760": {
       "weights": {
-        "humidity": 0.1753,
+        "humidity": 0.1621,
         "time_of_day": 0.0299,
-        "td_depression": 0.1589,
-        "refractivity": 0.0491,
-        "sky": 0.0661,
-        "season": 0.0892,
-        "wind": 0.0661,
-        "rain": 0.0796,
-        "pwat": 0.1708,
-        "pressure": 0.1151
+        "td_depression": 0.1591,
+        "refractivity": 0.0676,
+        "sky": 0.0662,
+        "season": 0.0893,
+        "wind": 0.0662,
+        "rain": 0.0797,
+        "pwat": 0.1696,
+        "pressure": 0.1101
       },
-      "n_samples": 321,
+      "n_samples": 320,
       "source": "contacts"
     },
     "10000": {
@@ -202,39 +203,39 @@
         "pwat": 0.1147,
         "pressure": 0.0967
       },
-      "n_samples": 54161,
+      "n_samples": 47260,
       "source": "contacts"
     },
     "24000": {
       "weights": {
-        "humidity": 0.1483,
-        "time_of_day": 0.0402,
-        "td_depression": 0.1187,
-        "refractivity": 0.0517,
-        "sky": 0.0494,
-        "season": 0.0733,
-        "wind": 0.0494,
-        "rain": 0.2224,
-        "pwat": 0.1348,
-        "pressure": 0.112
+        "humidity": 0.1514,
+        "time_of_day": 0.041,
+        "td_depression": 0.1211,
+        "refractivity": 0.0402,
+        "sky": 0.0504,
+        "season": 0.0748,
+        "wind": 0.0504,
+        "rain": 0.227,
+        "pwat": 0.1376,
+        "pressure": 0.1061
       },
-      "n_samples": 3808,
+      "n_samples": 3330,
       "source": "contacts"
     },
     "47000": {
       "weights": {
-        "humidity": 0.1403,
+        "humidity": 0.1402,
         "time_of_day": 0.0528,
-        "td_depression": 0.1123,
-        "refractivity": 0.0517,
-        "sky": 0.0468,
-        "season": 0.0757,
-        "wind": 0.0468,
-        "rain": 0.2387,
+        "td_depression": 0.1122,
+        "refractivity": 0.0522,
+        "sky": 0.0467,
+        "season": 0.0756,
+        "wind": 0.0467,
+        "rain": 0.2385,
         "pwat": 0.1275,
         "pressure": 0.1075
       },
-      "n_samples": 759,
+      "n_samples": 661,
       "source": "contacts"
     }
   }