What level is the orange warning for cold wave warning?

Level three. my country's cold wave early warning signal is the early warning signal used by the Central Meteorological Observatory when issuing cold wave disaster early warning in accordance with the "Central Meteorological Observatory Meteorological Disaster Early Warning Release Methods". The current cold wave warning is divided into three levels, which are represented by orange, yellow, and blue. The orange warning signal is the highest level of cold wave warning. However, some provinces and cities continue to use the "Central Meteorological Observatory Meteorological Disaster Warning Release Methods" issued by the China Meteorological Administration in 2007 according to their own characteristics, dividing cold wave warning signals into four levels: red warning, orange warning, yellow warning, and blue warning.

The cold wave early warning signal icon is represented by a thick arrow pointing downward from the upper left corner, in which the "℃" mark is "branded", which means that the temperature has dropped significantly. Cold wave is a common disastrous weather in China. It occurs frequently and has a wide range of activities. Cold wave, as the name suggests, means cold air rushing over like a tide. But it does not mean that all cold air that invades is called a cold wave. Generally, after the cold air invades a certain place, if it can reduce the temperature in those places by more than 10℃ within a day (24 hours), and at the same time, the lowest temperature on that day will When the temperature is below 5℃, we call this cold air a cold wave.