How to understand the weather forecast indicators: UV index, rainfall, temperature, humidity

Every day, we look at the weather forecast, but do we understand all the indicators in the weather forecast report?

When it comes to climatic conditions, people have to mention many important factors, not merely environmental temperatures, which are: temperature, humidity, wind speed and heat radiation, index UV . These elements have a close interaction, which can increase or decrease the harshness of the surrounding environment.

How to read temperature index in weather forecast

Temperature is the most familiar and understandable indicator in weather forecasts. Ambient temperature for the body is 20-25 degrees C. With this temperature, the body feels comfortable, works optimally without seeing or very few disorders occur.

The body feels hot when the temperature is 33 degrees or more.(Photo: CT Sinus Center).

The average temperature of the skin is about 33 degrees Celsius. Therefore, if the ambient temperature of 33 degrees C or below, the body will be able to radiate heat out and not feel hot. But if the ambient temperature is 33 degrees or more, the body will receive more heat from the environment causing a feeling of heat.

When predicting the ambient temperature, the forecasting agency usually informs the two lowest (at night) and the highest (in the afternoon). The highest number to predict in advance the body heat may suffer.

Also note, some applications have additional RealFeel temperatures - understood as actual temperatures (outdoor) that can be higher or lower than the predicted heat level. This temperature difference is due to the impact of other indicators such as humidity, wind, sun intensity .

How to read the number of rainfall in the weather forecast

Rainfall is a quantity that represents the level of rainfall more or less after each rain. The amount purchased is measured by the amount of rainwater collected on a flat surface that is not covered or covered by trees or trees and is measured in millimeters (millimeters).

1 mm rainfall means that the amount of rainwater collected per 1 square meter of flat ground after rain is 1 mm. Thus, if the rainfall is measured 200 mm, it means that after the rain the water will flood 200mm per 1 square meter of soil (in the condition of soil without water). In fact, water will seep into the ground and flow into rivers and streams, so we rarely feel the rain, except in the days of heavy rain.

Every year, there are about 100 rainy days in Vietnam with an average rainfall of 1,500 to 2,000mm, unevenly distributed. In the area of ​​Vietnam, about 600 billion tons of rain water is received each year, equivalent to about 20,000 tons of rainwater per hectare, concentrated mostly in the rainy season.

How to read in weather forecast news

Ultraviolet (UV index) index is an international standard measure of UV intensity on the surface of the earth - to assess the level of ultraviolet radiation at a specific location on a specific day.

This index is to encourage people to take appropriate protective measures because too much exposure to sunlight will cause sunburn, eye damage such as cataracts, skin aging, immunosuppression and cancer. leather letter.

Should be shielded carefully when going out on a sunny day to protect the skin.(Photo: Anitasfeast).

UV index is calculated from 1 to 11+, displayed from low to high in green, yellow, orange, red, purple and accompanied by recommendations.

UV indices are calculated from 1 to 11+.

How to read humidity index in weather forecast news

Humidity is a physical quantity typical of the amount of water vapor in the air; is an important feature of weather and climate. According to researchers, the humidity in the air is divided into 2 types: absolute humidity and relative humidity.

Absolute humidity is the moisture content in a unit of air volume, ie, how many mg of water / cm3 of air. But in reality the humidity absolutely does not show anything specific because it is not related to the evaporation ability of the air.

Relative humidity is expressed as a percentage (%), 100% relative humidity indicates that the air is filled with water vapor, to the saturation state.

High humidity for a long time can easily lead to cold.(Photo: Blog - Reliance Home Comfort).

In Vietnam, there is a humid tropical climate, the relative humidity is very high (90-100%). High humidity also reduces the ability to escape sweat, the body becomes heavy, tired, lifeless, if it takes place for a long time, it will lead to cold, flu .

In places with high humidity (tropical rain) the humid regular air contains very high bacterial density which can cause discomfort to humans, causing moisture, peeling wallpaper . this is the work Causes of respiratory problems, dengue fever, gastrointestinal disease in both humans and animals. High humidity also affects the operation of electrical and electronic devices.

Conversely, when the temperature rises, the weather gets warmer, the humidity in the air will decrease to a certain level. When the humidity is too low (polar, desert, high mountains), people will be dehydrated, causing dry, cracked skin . the resistance of plants and animals will also decrease.

Both low humidity and high humidity have certain effects on human life, so maintaining proper humidity is essential.

According to the researchers, the most ideal moisture, which makes people feel refreshed is about 50-60%, the process of perspiration occurs better, people feel more comfortable and refreshed.

How to read the dew point index in weather forecast news

The dew point of an air mass, at fixed atmospheric pressure, is the temperature at which the moisture content in the air mass condenses into liquid water. In other words, the dew point is the temperature at which the relative humidity of the air mass reaches 100%.

Dew frost determines relative humidity. When the relative humidity is high, the dew point is close to the current air temperature. If the relative humidity is 100%, the dew point will be equal to or higher than the air temperature at that time. If the relative humidity decreases, the dew point will be lower for the same temperature of the air mass.

People who are accustomed to continental climates often begin to feel uncomfortable when the dew point reaches about 15 ° - 20 ° C. Most people living in this area will assume that the dew point above 21 ° C is very suffocating.