Total Precipitation

Total precipitation quantifies all atmospheric water reaching the ground as liquid equivalent millimeters, combining rain, drizzle, snow (melted), sleet, and hail into a single measurement that reveals storm intensity and water delivery to landscapes. For photographers, precipitation data serves multiple planning functions beyond simply avoiding rain. Tracking precipitation accumulation over 24-48 hours forecasts waterfall flow for cascade photography: 10-20mm produces moderate flow enhancement, 30-50mm creates impressive volumes, and 75mm+ generates flood-stage drama.

Post-precipitation clearing offers prime photography windows: storms that delivered 15-30mm precipitation often clear to dramatic partly-cloudy skies with enhanced color saturation from moisture-scrubbed air and lingering dynamic clouds. Light precipitation below 0.5 mm/h (light drizzle) allows outdoor photography with modest rain protection, creating moody overcast conditions and wet surfaces that enhance color and texture. Moderate precipitation of 1-3 mm/h (light to moderate rain) challenges non-weather-sealed cameras but produces dramatic rainy-day scenes for prepared photographers with proper protective equipment. Heavy precipitation above 5 mm/h (heavy rain) forces all but the most extreme weather photographers indoors or under shelter, though clearing edges of such intense precipitation zones offer incredible light and rainbow opportunities.

Snow precipitation requires conversion: 10mm liquid equivalent typically produces 10cm fresh snow, perfect for winter landscape photography timing. PhotoWeather tracks precipitation forecasts to alert photographers to post-storm clearing windows occurring 2-4 hours after precipitation ends, enhanced waterfall flow lasting 24-72 hours after significant precipitation, and approach of light precipitation periods that add atmosphere without forcing shoot cancellation. Understanding precipitation intensity trends helps photographers time arrivals: shooting just as light precipitation ends captures lingering drama and clearing light, while shooting during light stable precipitation produces moody atmospheric work. Cumulative precipitation totals also forecast fog: 15-25mm of rain saturating ground and vegetation creates ideal overnight fog formation conditions 12-24 hours later when skies clear and winds calm.