Orange warning refers to a meteorological disaster warning signal. According to the degree of harm, urgency and development trend that meteorological disasters may cause, the levels of meteorological disaster warning signals are generally divided into four levels: IV (general), III (heavier), II (serious) and I (particularly serious), which are indicated by blue, yellow, orange and red in turn and marked in Chinese and English. The warning signals of typhoon, rainstorm, blizzard, cold wave and gale are divided into four levels, which are represented by blue, yellow, orange and red respectively. The high temperature warning signal is divided into three levels, which are represented by yellow, orange and red respectively.

Primary warning

In the administrative area of a province (autonomous region or municipality) or in the administrative areas of several provinces, the meteorological stations subordinate to the competent meteorological departments forecast the occurrence of disastrous weather and climate processes, and the intensity reached the extreme disastrous weather and climate standards formulated by the competent meteorological departments of the State Council. Or the meteorological level of geological disasters reaches level 5, and the meteorological level of forest (grassland) fire danger reaches level 5.

Secondary early warning

Its intensity reaches the disastrous weather and climate standard formulated by the competent meteorological department of the State Council, or the meteorological grade of geological disasters reaches Grade 4, and the fire risk grade of forests (grasslands) reaches Grade 4.

Level Ⅲ early warning

Its intensity reaches the disastrous weather and climate standard formulated by the competent meteorological department of the State Council, or the meteorological grade of geological disasters reaches Grade III, and the meteorological grade of forest (grassland) fire danger reaches Grade III.

Four-level warning

Its intensity reaches the disastrous weather and climate standard formulated by the competent meteorological department of the State Council, or the meteorological grade of geological disasters reaches Grade II, and the meteorological grade of forest (grassland) fire danger reaches Grade II.