Document SPC convective outlook behavior

docs/internal/briefing.md

@@ -61,6 +61,17 @@ builders run. Configured `location` values are prompt context only; Weather API
 `area_forecast_discussion` uses optional `sections` configuration to include a
 subset of discussion fields.
 
+`spc_convective_outlooks` uses collected SPC run metadata and derived
+report-period outlooks. It emits `checked: true` for a successfully fetched
+empty run, reports `outlook_count`, and includes prompt-facing outlook fields
+such as risk label, severity rank, valid times, source URL, image URL, and
+whether the outlook contains the configured location. It does not emit GeoJSON
+geometry.
+
+`spc_convective_discussion` uses the same derived report-period outlooks and
+discussion records. It is omitted unless at least one retained outlook has
+severity rank `3` or higher and matching discussion text exists.
+
 ## External Adapters Used
 
 None directly.
@@ -91,8 +102,8 @@ return an error for invalid required inputs.
 - SPC convective outlook output distinguishes checked empty outlook data from
   missing outlook source data and omits GeoJSON geometry from prompt-facing
   fields.
-- SPC convective discussion output is omitted unless a retained outlook meets
-  the internal severity threshold and matching discussion text is available.
+- SPC convective discussion output is omitted unless a retained outlook has
+  severity rank `3` or higher and matching discussion text is available.
 
 ## Tests