How many kinds of high temperature warning are there?

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

The yellow warning signal of high temperature indicates that the weather is sultry, which generally means that the maximum temperature will approach or reach above 35℃ within 24 hours; The high-temperature orange warning signal indicates that the weather is hot, which generally means that the maximum temperature will rise above 37℃ within 24 hours;

High temperature red warning signal means extremely hot weather, which generally means that the maximum temperature will rise above 39℃ within 24 hours.