How many levels of early warning signals are there and how to divide them?

Typhoon warning signals are divided into five levels, which are represented by white, blue, yellow, orange and red respectively.

(1) Typhoon White Warning Signal

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Meaning: It may be affected by tropical cyclones within 48 hours.

(2) Typhoon blue warning signal

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Meaning: it may be affected by tropical cyclones within 24 hours, with an average wind force of above 6 or a gust of above 7; Or have been affected by tropical cyclones, the average wind force is 6 ~ 7, or the gust is 7 ~ 8 and may continue.

(3) Typhoon yellow warning signal

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Meaning: It may be affected by tropical cyclones within 24 hours, with an average wind force of more than 8 or a gust of more than 9; Or it has been affected by tropical cyclones, with an average wind force of 8 ~ 9, or a gust of 9 ~ 10 and may continue.

(4) Typhoon orange warning signal

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Meaning: it may be affected by tropical cyclones within 12 hours, and the average wind force may be above 10, or the gust 1 1 above; Or have been affected by tropical cyclones, the average wind force 10 ~ 1 1, or the gust1/kloc-0 ~/2 may continue.

(5) Typhoon red warning signal

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Meaning: It may be or has been affected by typhoon within 12 hours, and the average wind power can reach above 12, or it has reached above 12 and may continue.

Second, the rainstorm warning signal

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

(1) Yellow rainstorm warning signal

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Meaning: There may be heavy rain in the local area within 6 hours, or heavy precipitation may continue.

(b) An orange rainstorm warning signal

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Meaning: In the past three hours, the local rainfall has reached more than 50 mm, and the rainfall may continue.

(3) Rainstorm red warning signal

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Meaning: In the past three hours, the local rainfall reached more than 100 mm, and the rainfall may continue.

Third, the high temperature warning signal

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

(A) high temperature yellow warning signal

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Meaning: It's sultry. Generally speaking, the maximum temperature will approach or reach above 35℃ within 24 hours.

(2) High temperature orange warning signal

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It's very hot. Generally speaking, the maximum temperature will rise above 37℃ within 24 hours.

(3) High temperature red warning signal.

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It's very hot. Generally speaking, the maximum temperature will rise above 39℃ within 24 hours.

Fourth, the cold warning signal

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

(A) cold yellow warning signal

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Meaning: It is estimated that within 24 hours, affected by the invasion of cold air in the north, the local temperature will drop by more than 10℃, or the daily average temperature will remain below 12℃.

(2) Cold wave orange warning signal

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Meaning: Affected by the invasion of cold air in the north, it is expected that the local minimum temperature will drop below 5℃.

(3) Cold red warning signal

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Meaning: Affected by the invasion of cold air in the north, it is expected that the local minimum temperature will drop below 0℃.

Five, fog warning signal

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

(1) foggy yellow warning signal

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Meaning: Fog with visibility less than 500 meters may appear within 12 hours, or fog with visibility less than 500 meters and greater than or equal to 200 meters has appeared and may continue.

(2) Fog orange warning signal

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Meaning: Dense fog with visibility less than 200 meters may appear within 6 hours, or dense fog with visibility less than 200 meters and greater than or equal to 50 meters has appeared and may continue.

(3) Fog red warning signal

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Meaning: Strong fog with visibility less than 50 meters may appear within 2 hours, or strong fog with visibility less than 50 meters has appeared and may continue.

Sixth, the smog weather warning signal

Haze weather warning signal, expressed in yellow.

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Meaning:/kloc-smog weather may occur within 0/2 hours, or it has already appeared and may continue.

Seven, thunderstorm gale warning signal

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

(1) blue warning signal of thunderstorm and gale

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Meaning: It may be affected by thunderstorms and strong winds within 6 hours, with an average wind force of more than 6, or a gust of more than 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.

(2) Yellow warning signal of thunderstorm and gale

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Meaning: It may be affected by thunderstorms and strong winds within 6 hours, with an average wind force of 8 or above, or a gust of 9 or above 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.

(3) orange warning signal of thunderstorm and gale

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Meaning: It may be affected by thunderstorms and strong winds within 2 hours, and the average wind power may be 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.

(4) Thunderstorm and gale red warning signal

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Meaning: It may be affected by thunderstorms and strong winds within 2 hours, and the average wind power can reach more than 12 with strong lightning; Or it has been affected by thunderstorms and strong winds, and the average wind force is above 12 with strong lightning, and it may continue.

Eight, road icing warning signal

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

(A) road icing yellow warning signal

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Meaning:/kloc-There may be road icing that has an impact on traffic within 0/2 hours.

(b) orange warning signal for road icing

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Meaning: There may be road icing that has a great impact on traffic within 6 hours.

(3) The road is frozen in red warning signal.

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Meaning: There may be or has been road icing that has a great impact on traffic within 2 hours.

Nine, hail warning signal

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

(1) Hail orange warning signal

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Meaning: There may be hail with lightning weather within 6 hours, and it may cause hail disaster.

(2) Hail red warning signal

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Meaning: There is a great possibility of hail with lightning weather within 2 hours, which may cause a great hail disaster.

Ten, forest fire warning signal

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

(A) the yellow warning signal of forest fire

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Meaning: The forest fire risk rating is Grade III. Moderate danger, combustible materials in the forest are easy to burn and forest fires are easy to occur.

(b) orange warning signal of forest fire danger

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Meaning: The forest fire risk rating is Grade 4. Highly dangerous and combustible substances in the forest are easy to burn, and forest fires are prone to occur, and the fire spreads quickly.

(3) Forest fire risk red warning signal

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Meaning: The forest fire risk rating is five. Extremely dangerous, combustible materials in the forest are easy to burn, and forest fires are prone to occur, and the fire spreads very quickly.