Made forecast-period conditionCode optional

internal/normalizers/nws/forecast.go

@@ -23,10 +23,11 @@ import (
 // builders by raw schema.
 //
 // Caveats / policy:
-//  1. NWS forecast periods do not include METAR presentWeather phenomena, so ConditionCode
-//     is inferred from period.shortForecast (with a conservative icon-based fallback).
-//  2. Temperature is converted to °C when NWS supplies °F.
-//  3. WindSpeed is parsed from strings like "9 mph" / "10 to 15 mph" and converted to km/h.
+//  1. Hourly NWS forecast periods do not include METAR presentWeather phenomena, so
+//     ConditionCode is inferred from period.shortForecast (with a conservative icon fallback).
+//  2. Narrative NWS periods intentionally leave ConditionCode unset.
+//  3. Temperature is converted to °C when NWS supplies °F.
+//  4. WindSpeed is parsed from strings like "9 mph" / "10 to 15 mph" and converted to km/h.
 type ForecastNormalizer struct{}
 
 func (ForecastNormalizer) Match(e event.Event) bool {
@@ -224,6 +225,7 @@ func mapHourlyForecastPeriod(idx int, p nwsHourlyForecastPeriod) (model.WeatherF
 	// Infer WMO from shortForecast (and fall back to icon token).
 	providerDesc := strings.TrimSpace(p.ShortForecast)
 	wmo := wmoFromNWSForecast(providerDesc, p.Icon, tempC)
+	wmoPtr := wmoCodePtr(wmo)
 
 	return model.WeatherForecastPeriod{
 		StartTime: start,
@@ -232,7 +234,7 @@ func mapHourlyForecastPeriod(idx int, p nwsHourlyForecastPeriod) (model.WeatherF
 		Name:  strings.TrimSpace(p.Name),
 		IsDay: isDay,
 
-		ConditionCode: wmo,
+		ConditionCode: wmoPtr,
 
 		// For forecasts, keep provider short forecast text as the human-facing description.
 		TextDescription: providerDesc,
@@ -264,9 +266,7 @@ func mapNarrativeForecastPeriod(idx int, p nwsNarrativeForecastPeriod) (model.We
 
 	tempC := tempCFromNWS(p.Temperature, p.TemperatureUnit)
 
-	// Infer WMO from shortForecast (and fall back to icon token).
 	shortForecast := strings.TrimSpace(p.ShortForecast)
-	wmo := wmoFromNWSForecast(shortForecast, p.Icon, tempC)
 
 	textDescription := strings.TrimSpace(p.DetailedForecast)
 	if textDescription == "" {
@@ -280,7 +280,7 @@ func mapNarrativeForecastPeriod(idx int, p nwsNarrativeForecastPeriod) (model.We
 		Name:  strings.TrimSpace(p.Name),
 		IsDay: isDay,
 
-		ConditionCode: wmo,
+		ConditionCode: nil,
 
 		TextDescription: textDescription,
 
@@ -292,3 +292,8 @@ func mapNarrativeForecastPeriod(idx int, p nwsNarrativeForecastPeriod) (model.We
 		ProbabilityOfPrecipitationPercent: p.ProbabilityOfPrecipitation.Value,
 	}, nil
 }
+
+func wmoCodePtr(code model.WMOCode) *model.WMOCode {
+	out := code
+	return &out
+}

internal/normalizers/nws/forecast_test.go

@@ -35,6 +35,9 @@ func TestBuildHourlyForecastUsesShortForecastAsTextDescription(t *testing.T) {
 	if got, want := run.Periods[0].TextDescription, "Mostly Cloudy"; got != want {
 		t.Fatalf("TextDescription = %q, want %q", got, want)
 	}
+	if run.Periods[0].ConditionCode == nil {
+		t.Fatalf("ConditionCode is nil, want inferred hourly WMO code")
+	}
 
 	wantIssued := time.Date(2026, 3, 16, 18, 0, 0, 0, time.UTC)
 	if !run.IssuedAt.Equal(wantIssued) {
@@ -261,6 +264,9 @@ func TestBuildNarrativeForecastMapsExpectedFields(t *testing.T) {
 	if p.ProbabilityOfPrecipitationPercent == nil || *p.ProbabilityOfPrecipitationPercent != 20 {
 		t.Fatalf("ProbabilityOfPrecipitationPercent = %v, want 20", p.ProbabilityOfPrecipitationPercent)
 	}
+	if p.ConditionCode != nil {
+		t.Fatalf("ConditionCode = %v, want nil for narrative period", p.ConditionCode)
+	}
 
 	wantIssued := time.Date(2026, 3, 27, 15, 17, 1, 0, time.UTC)
 	if !run.IssuedAt.Equal(wantIssued) {