What Does mm of Rain Mean?
When you hear weather forecasts mention “mm of rain“, it refers to millimeters of precipitation. This unit measures the depth of rainwater collected on a flat surface, assuming no runoff or absorption. One millimeter of rain equals one liter of water per square meter. Understanding mm of rain meaning helps interpret rainfall intensity and its impact.
How Rainfall Measurement Works
Meteorologists use rain gauges to collect and measure precipitation. The collected water depth in millimeters indicates rainfall amount. Light rain might be under 2.5 mm, while heavy downpours exceed 7.6 mm per hour.
Why Millimeters Are Used
Millimeters provide a precise, standardized unit compatible with global meteorological systems. This measurement helps compare rainfall data across regions and seasons accurately.
Common Questions About mm Rain Measurement
Is 10 mm of rain a lot? Yes, 10 mm per hour is considered heavy rain, potentially causing flooding.
How does mm relate to weather warnings? Higher mm values often trigger alerts for agriculture, transportation, and safety planning.
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