# About precipitation in simple words

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Precipitation is an atmospheric moisture that falls on the ground in the form of rain, snow, or hail.

## How to measure precipitation

Usually precipitation is calculated in millimeters.

Millimeters of precipitation is a layer of water that would have formed from precipitation if it had not penetrated into the soil, did not flow, or evaporate.

1 mm of precipitation equals one liter of water per square meter.

The amount of precipitation is measured over a certain period of time, for example, per day, month, or year.

To measure precipitation meteorologists use tanks - rain gauges. These are, most often, simple metal barrels. A funnel with an area of ​​one square meter is installed above the tank. When it's time to measure precipitation - calculate by how much the water has risen.

By the way, when solid precipitation - snow or hail - melts, the experts measure the height of the resulting water.

If it is raining, according to the forecast, should you take an umbrella, or should you wait it out altogether? Take into account this approximate amount of precipitation per day:

• light rain gives up to 2–4 mm of precipitation;
• moderate rain gives 5–6 mm of precipitation;
• strong - about 15–20 mm;
• and rainfall - more than 30 mm.

To realize how large this amount of water is, you should know that 1 mm of precipitation per 1 ha of area gives 900 buckets of water.

In Windy.app the Compare mode allows not only to observe the amount of precipitation, but also to compare forecasts by several weather forecast models.

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