Updated precipitation timing language in the shared template

internal/forecast/derive.go

@@ -81,6 +81,7 @@ type PrecipitationWindow struct {
 	End                         *time.Time `json:"end,omitempty"`
 	MaxPrecipitationProbability TimedValue `json:"maxPrecipitationProbability"`
 	ProbabilityThreshold        float64    `json:"probabilityThreshold"`
+	TextDescriptions            []string   `json:"textDescriptions,omitempty"`
 }
 
 func BuildPrecipTiming(periods []weatherdata.ForecastPeriod) PrecipTiming {
@@ -114,6 +115,7 @@ func buildPrecipTimingWithThreshold(periods []weatherdata.ForecastPeriod, thresh
 			},
 			ProbabilityThreshold: threshold,
 		}
+		appendActiveTextDescription(active, forecastPeriod.TextDescription)
 		activeLastEnd = forecastPeriod.EndTime
 		if timing.FirstPrecipitation == nil {
 			timing.FirstPrecipitation = &TimedValue{
@@ -135,6 +137,8 @@ func buildPrecipTimingWithThreshold(periods []weatherdata.ForecastPeriod, thresh
 				if forecastPeriod.StartTime.After(activeLastEnd) {
 					closeActive()
 					startActive(forecastPeriod, probability)
+				} else {
+					appendActiveTextDescription(active, forecastPeriod.TextDescription)
 				}
 				if probability > active.MaxPrecipitationProbability.Value {
 					active.MaxPrecipitationProbability = TimedValue{
@@ -166,6 +170,17 @@ func buildPrecipTimingWithThreshold(periods []weatherdata.ForecastPeriod, thresh
 	return timing
 }
 
+func appendActiveTextDescription(window *PrecipitationWindow, text string) {
+	if window == nil {
+		return
+	}
+	text = strings.TrimSpace(text)
+	if text == "" {
+		return
+	}
+	window.TextDescriptions = append(window.TextDescriptions, text)
+}
+
 func BuildDailySummary(bundle *weatherdata.Bundle, date time.Time, location *time.Location, dayparts []DaypartDefinition) (*DailySummary, error) {
 	if bundle == nil {
 		return nil, fmt.Errorf("forecast bundle is required")

internal/forecast/derive_test.go

@@ -245,10 +245,16 @@ func TestBuildPrecipTimingBuildsThresholdWindows(t *testing.T) {
 	if first.MaxPrecipitationProbability.Value != 60 || first.MaxPrecipitationProbability.Time.Format(time.RFC3339) != "2026-05-29T10:00:00-05:00" {
 		t.Fatalf("first window max = %#v, want 60 at 10 AM", first.MaxPrecipitationProbability)
 	}
+	if len(first.TextDescriptions) != 2 || first.TextDescriptions[0] != "Showers" || first.TextDescriptions[1] != "Rain likely" {
+		t.Fatalf("first window text descriptions = %#v, want contributing hourly descriptions", first.TextDescriptions)
+	}
 	second := timing.PrecipitationWindows[1]
 	if second.Start.Format(time.RFC3339) != "2026-05-29T12:00:00-05:00" || second.End == nil || second.End.Format(time.RFC3339) != "2026-05-29T13:00:00-05:00" {
 		t.Fatalf("second window = %#v, want noon-1 PM", second)
 	}
+	if len(second.TextDescriptions) != 1 || second.TextDescriptions[0] != "Thunderstorms" {
+		t.Fatalf("second window text descriptions = %#v, want thunderstorm description", second.TextDescriptions)
+	}
 	if !timing.ThunderMentioned {
 		t.Fatal("ThunderMentioned = false, want true")
 	}