Cold front categories

China classifies the strength of cold fronts according to five categories based on the temperature change before and after the front.

The categories are weak, medium, strong, extremely strong and cold-air outbreak, which can bring temperature drops of 6 to 10 degrees or more within two days.

Cold fronts and cold-air outbreaks, which bring temperature drops and heavy winds, usually occur in April and September in China, according to the China Meteorological Administration.

Cold fronts are seen more frequently in Xinjiang and in the northeastern parts of the country than in the southern areas.

In addition to the drop in temperatures, cold fronts can also bring complex changes in barometric pressure, wind direction, humidity and even in pollutants levels, which can affect public health.

Colds and respiratory diseases are common during front colds, with children and older people facing an increased risk of getting sick.

Dramatic temperature drops may also lead to higher death rates.

Drivers should also be aware of the possibility of icy roads due to the drop in temperatures.

wangqian@chinadaily.com.cn