Update the shared precipitation timing template

docs/internal/reporttemplate.md

@@ -76,9 +76,9 @@ fail rendering instead of producing incomplete Markdown.
 
 Daily and Tomorrow call the shared `daypart_forecast` partial. Today calls
 `today_daypart_forecast` so it can omit elapsed or missing dayparts. Daily,
-Today, and Tomorrow call the shared `precipitation_timing` partial. Partial
-files are parsed with each top-level template at render time and receive the
-same typed render context as the caller.
+Today, Tomorrow, and Hourly call the shared `precipitation_timing` partial.
+Partial files are parsed with each top-level template at render time and
+receive the same typed render context as the caller.
 
 ## Schema Contract
 

docs/templates.md

@@ -18,7 +18,7 @@ Shared named partials live under `internal/reporttemplate/templates/partials/`:
 
 - `daypart_forecast.md.tmpl`, used by Daily and Tomorrow
 - `today_daypart_forecast.md.tmpl`, used by Today
-- `precipitation_timing.md.tmpl`, used by Daily, Today, and Tomorrow
+- `precipitation_timing.md.tmpl`, used by Daily, Today, Tomorrow, and Hourly
 
 Templates are rendered from structured contexts such as `DailyRenderContext`,
 `TodayRenderContext`, `TomorrowRenderContext`, and `HourlyRenderContext`.
@@ -294,7 +294,7 @@ Common fields:
 | `.Modules.PrecipTiming.PrecipitationWindows[].MaxPopTime` | string | Friendly local time for the window maximum. |
 | `.Modules.PrecipTiming.PrecipitationWindows[].MaxPopHourLabel` | string | Friendly hour label for the window maximum. |
 | `.Modules.PrecipTiming.PrecipitationWindows[].PrecipitationType` | string | Conservatively inferred precipitation type, such as `showers and thunderstorms`. |
-| `.Modules.PrecipTiming.PrecipitationWindows[].ExpectationPhrase` | string | Probability-based sentence used by day-style templates. |
+| `.Modules.PrecipTiming.PrecipitationWindows[].ExpectationPhrase` | string | Probability-based sentence used by precipitation timing templates. |
 | `.Modules.PrecipTiming.ThunderMentioned` | bool | Whether thunder is mentioned in the forecast text. |
 
 ### Daypart Summaries

internal/reporttemplate/reporttemplate_test.go

@@ -236,7 +236,7 @@ func TestRenderHourly(t *testing.T) {
 				MaxPopPercent: intPtr(70),
 				MaxPopTime:    "10 AM",
 				PrecipitationWindows: []testPrecipWindow{
-					{PeriodBegins: "10 AM", PeriodBeginsHourLabel: "10:00 AM", PeriodEnds: "12 PM", PeriodEndsHourLabel: "12:00 PM", MaxPopPercent: intPtr(70), MaxPopTime: "10 AM", MaxPopHourLabel: "10:00 AM"},
+					{PeriodBegins: "10 AM", PeriodBeginsHourLabel: "10:00 AM", PeriodEnds: "12 PM", PeriodEndsHourLabel: "12:00 PM", MaxPopPercent: intPtr(70), MaxPopTime: "10 AM", MaxPopHourLabel: "10:00 AM", ExpectationPhrase: "Expect showers."},
 				},
 			},
 			AlertDigest: &testAlertDigest{
@@ -272,7 +272,7 @@ func TestRenderHourly(t *testing.T) {
 		"- **Flood Watch**: Flood Watch until 2:30 PM",
 		"- **9:00 AM:** 74°F and cloudy.",
 		"- **10:00 AM:** 75°F and showers. Probability of precipitation is 70%.",
-		"- **10:00 AM** to **12:00 PM**: Precipitation is expected during this period. The peak precipitation chance is 70% at 10:00 AM.",
+		"- **10:00 AM** to **12:00 PM**: Expect showers. The peak precipitation chance is 70% at 10:00 AM.",
 		"A cold front is moving into the region.",
 		"A front will keep the region unsettled.",
 	} {
@@ -732,6 +732,48 @@ func TestRenderHourlyOmitsConditionalSectionsForClearWeather(t *testing.T) {
 	}
 }
 
+func TestRenderHourlyUsesSharedOpenEndedPrecipitationTiming(t *testing.T) {
+	rendered, err := Render("hourly", testRenderContext{
+		Report: testReportContext{
+			Title:            "Hourly Report",
+			GeneratedAtLabel: "Saturday, June 14, 2026 at 9:14 AM",
+		},
+		GeneratedText: testGeneratedText{
+			Summary:             "Rain chances increase through midday.",
+			ForecastDiscussion:  "Showers may continue beyond the report period.",
+			PrecipitationTiming: "Plan for wet roads through the end of the period.",
+		},
+		Modules: testModules{
+			CurrentConditions: &testCurrentConditions{},
+			HourlyForecast:    &testHourlyForecast{},
+			AlertDigest:       &testAlertDigest{},
+			PrecipTiming: &testPrecipTiming{
+				PrecipitationWindows: []testPrecipWindow{
+					{
+						PeriodBeginsHourLabel: "8:00 AM",
+						MaxPopPercent:         intPtr(60),
+						MaxPopHourLabel:       "10:00 AM",
+						ExpectationPhrase:     "Showers likely.",
+					},
+				},
+			},
+		},
+	})
+	if err != nil {
+		t.Fatalf("Render() error = %v", err)
+	}
+	text := string(rendered)
+	for _, want := range []string{
+		"## Precipitation Timing",
+		"- **Starting at 8:00 AM**: Showers likely. The peak precipitation chance is 60% at 10:00 AM.",
+		"Plan for wet roads through the end of the period.",
+	} {
+		if !strings.Contains(text, want) {
+			t.Fatalf("rendered template missing %q:\n%s", want, text)
+		}
+	}
+}
+
 func TestUnknownAssetsReturnActionableErrors(t *testing.T) {
 	if _, err := Template("missing"); err == nil || !strings.Contains(err.Error(), `unknown report template "missing"`) {
 		t.Fatalf("Template() error = %v, want unknown template", err)

internal/reporttemplate/templates/hourly.md.tmpl

@@ -26,14 +26,7 @@ Current conditions are unavailable.
 - No hourly forecast rows are available.
 {{ end }}
 
-{{ with .Modules.PrecipTiming }}{{ with .PrecipitationWindows }}
-## Precipitation Timing
-{{ range . }}{{ $window := . }}
-- **{{ if .PeriodBeginsHourLabel }}{{ .PeriodBeginsHourLabel }}{{ else }}{{ .PeriodBegins }}{{ end }}**{{ with .PeriodEndsHourLabel }} to **{{ . }}**{{ else }}{{ with .PeriodEnds }} to **{{ . }}**{{ end }}{{ end }}: Precipitation is expected during this period.{{ with .MaxPopPercent }} The peak precipitation chance is {{ . }}%{{ with $window.MaxPopHourLabel }} at {{ . }}{{ else }}{{ with $window.MaxPopTime }} at {{ . }}{{ end }}{{ end }}.{{ end }}
-{{ end }}{{ with $.GeneratedText.PrecipitationTiming }}
-{{ . }}
-{{ end }}
-{{ end }}{{ end }}
+{{ template "precipitation_timing" . }}
 ## Forecast Discussion
 
 {{ .GeneratedText.ForecastDiscussion }}

internal/reporttemplate/templates/partials/precipitation_timing.md.tmpl

@@ -1,7 +1,7 @@
 {{ define "precipitation_timing" }}{{ with .Modules.PrecipTiming }}{{ with .PrecipitationWindows }}
 ## Precipitation Timing
 {{ range . }}{{ $window := . }}
-- **{{ if .PeriodBeginsHourLabel }}{{ .PeriodBeginsHourLabel }}{{ else }}{{ .PeriodBegins }}{{ end }}**{{ with .PeriodEndsHourLabel }} to **{{ . }}**{{ else }}{{ with .PeriodEnds }} to **{{ . }}**{{ end }}{{ end }}: {{ with .ExpectationPhrase }}{{ . }}{{ else }}Chance of precipitation.{{ end }}{{ with .MaxPopPercent }} The peak precipitation chance is {{ . }}%{{ with $window.MaxPopHourLabel }} at {{ . }}{{ else }}{{ with $window.MaxPopTime }} at {{ . }}{{ end }}{{ end }}.{{ end }}
+- **{{ if or .PeriodEndsHourLabel .PeriodEnds }}{{ if .PeriodBeginsHourLabel }}{{ .PeriodBeginsHourLabel }}{{ else }}{{ .PeriodBegins }}{{ end }}{{ else }}Starting at {{ if .PeriodBeginsHourLabel }}{{ .PeriodBeginsHourLabel }}{{ else }}{{ .PeriodBegins }}{{ end }}{{ end }}**{{ with .PeriodEndsHourLabel }} to **{{ . }}**{{ else }}{{ with .PeriodEnds }} to **{{ . }}**{{ end }}{{ end }}: {{ with .ExpectationPhrase }}{{ . }}{{ else }}Chance of precipitation.{{ end }}{{ with .MaxPopPercent }} The peak precipitation chance is {{ . }}%{{ with $window.MaxPopHourLabel }} at {{ . }}{{ else }}{{ with $window.MaxPopTime }} at {{ . }}{{ end }}{{ end }}.{{ end }}
 {{ end }}{{ with $.GeneratedText.PrecipitationTiming }}
 {{ . }}
 {{ end }}