My four-year-old son watches the weather forecast every day. How to stop him when it snows?

With the weather forecast becoming more and more accurate, many of these indexes are just "looking at flowers" in our daily life. We only know that some high indexes may be harmful to our health, some low indexes may be harmful to our health, and some indexes may be dangerous if we travel in dark colors. Today, Bian Xiao will give you a popular science lesson about how to classify the levels of color warning in weather forecast. This article is one of the articles on weather science. Interested friends can pay attention to Bian Xiao. The next article focuses on PM2.5, air pressure, visibility, ultraviolet index and air quality index. )

Color trend arrangement chart

Color warning

The high temperature warning signal is divided into two levels, which are represented by orange and red respectively.

The hail warning signal is divided into two levels, which are represented by orange and red respectively.

The cold wave warning signal is divided into three levels, which are represented by blue, yellow and orange respectively.

The rainstorm warning signal is divided into three levels, which are represented by yellow, orange and red respectively.

The fog warning signal is divided into three levels, which are represented by yellow, orange and red respectively.

The warning signal of sandstorm is divided into three levels, which are represented by yellow, orange and red respectively.

Snow disaster warning signals are divided into three levels, which are represented by yellow, orange and red respectively.

The warning signal of road icing is divided into three levels, which are represented by yellow, orange and red respectively.

Thunderstorm and gale warning signals are divided into four levels, which are represented by blue, yellow, orange and red respectively.

Gale warning (except typhoon, thunderstorm and gale) is divided into four levels, which are represented by blue, yellow, orange and red respectively.

Typhoon warning is divided into four levels according to approaching time and intensity, which are represented by blue, yellow, orange and red respectively.

From the above, we can see such a rule:

No matter how many grades there are, the color grades from low to high are blue (lowest), yellow, orange and red (highest).

Seeing this, some friends must have questions. To what extent are these colors used in daily life?

Color correspondence degree

1, blue warning

Blue rainstorm warning signal:/kloc-within 0/2 hours, the rainfall will reach more than 50 mm, or it has reached more than 50 mm and the rainfall may continue.

Warning signal of blue blizzard: 12 hours, the snowfall will reach more than 4 mm, or it has reached more than 4 mm and the snowfall continues, which may have an impact on traffic or agriculture and animal husbandry.

Typhoon blue warning signal: it may or may have been affected by tropical cyclones within 24 hours, and the average wind force along the coast or land is above 6, or the gust is above 8 and may continue.

Blue warning signal of thunderstorm and gale: it may be affected by thunderstorm and gale within 6 hours, with an average wind force of above 6 or a gust of above 7 accompanied by lightning; Or have been affected by thunderstorms and strong winds, with an average wind force of 6-7, or gusts of 7-8 accompanied by lightning, and may continue.

Blue rainstorm warning signal:/kloc-within 0/2 hours, the rainfall will reach more than 50 mm, or it has reached more than 50 mm and the rainfall may continue.

Blue warning signal of frost: within 48 hours, the ground minimum temperature drops below 0℃, which has an impact on agriculture, or has dropped below 0℃, which has already had an impact on agriculture and may continue.

2. Yellow warning

Yellow rainstorm warning signal: The rainfall will reach more than 50 mm within 6 hours, or it has already reached more than 50 mm and the rainfall may continue.

Yellow warning signal of blizzard: 12 hours, the snowfall will reach more than 6 mm, or it has reached more than 6 mm and the snowfall continues, which may affect traffic or agriculture and animal husbandry.

Yellow warning signal of ozone: ozone with an hourly average concentration exceeding 100ppb may appear in the next 4 hours, or ozone with an hourly concentration exceeding 100ppb has already appeared and may continue.

Yellow warning of forest fire: moderate danger, combustible materials in the forest are easy to burn, and forest fires are easy to occur.

Yellow warning signal of blizzard: 12 hours, there may be snowfall affecting traffic or agriculture.

Haze yellow warning signal: Haze with visibility less than 3000m may appear within 12 hours, or haze with visibility less than 3000m has already appeared and may continue.

Yellow warning signal of typhoon: it may or may have been affected by tropical cyclones within 24 hours, and the average wind force along the coast or land is above 8, or the gust is above 10 and may continue.

Yellow warning signal of thunderstorm and gale: it may be affected by thunderstorm and gale within 6 hours, and the average wind force can reach above 8, or the gust is above 9 accompanied by strong lightning; Or have been affected by thunderstorms and strong winds, with an average wind force of 8-9, or a gust of 9- 10 accompanied by strong lightning, and may continue.

Orange alert

Rainstorm orange warning signal: within 3 hours, the rainfall will reach more than 50 mm, or it has reached more than 50 mm and the rainfall may continue.

Blizzard orange warning signal: the snowfall will reach10mm or above within 6 hours, or it has reached10mm and the snowfall continues, which may or has already caused great impact on traffic or agriculture and animal husbandry.

Hail orange warning signal: there may be hail accompanied by lightning within 6 hours, which may cause hail disaster.

Ozone orange warning signal: ozone concentration exceeds 120ppb.

Orange warning of forest fire: highly dangerous, combustible materials in the forest are easy to burn, forest fires are prone to occur, and the fire spreads quickly.

Snow disaster orange warning signal: within 6 hours, there may be snowfall that has a great impact on traffic or agriculture, or there has been snowfall that has a great impact on traffic or agriculture and may continue.

Haze orange warning signal: Haze with visibility less than 2000 meters may appear within 6 hours, or haze with visibility less than 2000 meters has appeared and may continue.

Typhoon orange warning signal: it may be or has been affected by tropical cyclones within 12 hours, and the average coastal or land wind force is above 10, or the gust is above 12 and may continue.

Orange warning signal of thunderstorm and gale: it may be affected by thunderstorm and gale within 6 hours, and the average wind force can reach above 8, or the gust is above 9 accompanied by strong lightning; Or have been affected by thunderstorms and strong winds, with an average wind force of 8-9, or a gust of 9- 10 accompanied by strong lightning, and may continue.

red alert

Rainstorm in red warning signal: within 3 hours, the rainfall will reach 100 mm or above 100 mm and the rainfall may continue.

Red Blizzard Warning Signal: The snowfall will reach 15mm or above within 6 hours, or it has reached 15mm and the snowfall continues, which may or has already caused a great impact on traffic or agriculture and animal husbandry.

Red Hail Warning Signal: It is more likely that there will be hail with lightning weather within 2 hours, which may cause a large hail disaster.

Red warning of forest fire danger: extremely dangerous, combustible materials in the forest are extremely easy to burn, and forest fires are prone to occur, and the fire spreads very fast.

Blizzard in red warning signal: There may be snowfall that has a great impact on traffic or agriculture within 2 hours, or there has been snowfall that has a great impact on traffic or agriculture and may continue.

Haze red warning signal: visibility is less than 5000m, and PM2.5 concentration is more than 500μ g/m3.

Typhoon red warning signal: It may or may have been affected by tropical cyclones within 6 hours, with the average wind force 12 or gust 14 above along the coast or land, and it may continue.

Thunderstorm and gale red warning signal: It may be affected by thunderstorm and gale within 2 hours, with the average wind force reaching above 10, or the gust 1 1 above, accompanied by strong lightning; Or have been affected by thunderstorms and strong winds, the average wind force 10- 1 1, or gust112 accompanied by strong lightning, and may continue.

How many times have there been red warnings in the history of China?

A foggy red warning: 20 17-0 1-03, the Central Meteorological Observatory issued the highest level foggy red warning for the first time!

thick fog

More common sense in daily life and less anxiety in life.