"How Much Will It Rain?" What will the weather be like tomorrow PPT courseware 4

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"How Much Will It Rain?" What will the weather be like tomorrow PPT courseware 4

What is rainfall?

The depth of rainwater that falls from the sky on the ground and accumulates on the ground without evaporation, infiltration, or loss is called rainfall.

What is the unit of rainfall?

The unit of rainfall is millimeters (mm), and meteorological experts use millimeters to express the size of rainfall.

The amount of rain is expressed in terms of rainfall, which can be measured in millimeters.

So how is the rainfall measured?

Let’s take a look at how various types of rainfall are classified in the weather forecast.

Light rain: refers to the amount of rainfall between 0.1 and 10 millimeters in 24 hours, which can wet clothes and make the soil and ground completely wet, but there is no accumulation of water.

Moderate rain: refers to the rainfall between 10 and 25 mm within 24 hours, the sound of rain can be heard, and there is a small amount of water in low-lying areas.

Heavy rain: refers to the amount of rainfall between 25 and 50 millimeters within 24 hours, the sound of rain is intense, water accumulates in areas with poor drainage, and the water in ditches flows quickly.

Heavy rain: refers to the amount of rainfall between 50 and 100 millimeters within 24 hours. It rains heavily and water accumulates on the road.

Heavy rainstorm: refers to rainfall between 100 and 200 millimeters within 24 hours. The rain is fierce and the water in low-lying areas is knee-deep.

Extremely heavy rain: refers to rainfall exceeding 200 millimeters within 24 hours. The heavy rain comes overwhelmingly, often leading to flash floods and flooding of large areas of farmland and even villages.

Rainfall will have an impact on human production and life:

There is little rainfall throughout the year and there will be droughts.

Heavy rainfall in summer can cause floods.

think

Does the diameter of the rain gauge affect the measurement?

Is it okay to use rain gauges of different sizes to measure precipitation?

Measuring precipitation has nothing to do with the thickness and size of the rain gauge used. What matters is the height of the rain in the gauge.

You can pour some water into the unscaled part of the simple rain gauge first.

Expand knowledge

1. When collecting rainwater using containers with different diameters, they should be placed on a flat and open ground; for the convenience of observation, use a transparent container to directly measure the height of the water with a ruler.

2. When measuring rainfall, the measurement time should be recorded in order to compare the magnitude of the rainfall.

3. Use a simple rain gauge to measure rainfall. The location of the rain gauge will not affect the height of collected rainwater, but you should pay attention to whether there will be water droplets splashing or dripping from the eaves, which will affect the accuracy of the measurement.

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Update Time: 2024-10-03

This template belongs to science courseware E-education edition fourth grade science volume 1 industry PPT template

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