diff --git a/sql/migrations/004_nws_states_to_bbox.sql b/sql/migrations/004_nws_states_to_bbox.sql
new file mode 100644
index 0000000..5294a87
--- /dev/null
+++ b/sql/migrations/004_nws_states_to_bbox.sql
@@ -0,0 +1,11 @@
+-- Migration: 004_nws_states_to_bbox
+-- Converts NWS adapter settings from states list to region bbox.
+-- Bbox covers ID/OR/WA/MT/WY/UT/NV with buffer.
+
+UPDATE config.adapters
+SET settings = jsonb_set(
+    settings - 'states',  -- Remove states key
+    '{region}',
+    '{"north": 49.5, "south": 31.0, "east": -102.0, "west": -124.5}'::jsonb
+)
+WHERE name = 'nws';