When will the fog in Shanghai dissipate?

On February 28, 2023, the fog gradually dispersed.

Under the conditions of radiation cooling and static weather, from midnight today to tomorrow morning, foggy weather with visibility less than 500 meters will appear in most parts of the city, and the visibility in the western suburbs and coastal areas along the river will be less than 200 meters.

During the day, the sun appeared and the fog gradually dissipated, but there was a slight haze. Low visibility weather has a great impact on traffic, especially inter-provincial traffic. Pay attention to safety when traveling and keep abreast of traffic information.

Nationwide, the smog weather mainly affects the period from 28th to 30th, and the strongest smog process will occur in North China, Huanghuai and other places since autumn and winter this year.

The fog on the 28th mainly affected eastern Shandong and Jiangsu. The 29th mainly affected southern Shandong, eastern Anhui, Jiangsu, northern Zhejiang and other places; The 30th mainly affected southern Tianjin, eastern Hebei, western Shandong, Sichuan, Chongqing and other places. From 28th to 30th, the haze mainly affected North China, North China and Northeast China, and Tianjin, central and southern Hebei, western Shandong and northern Henan were severe haze.

Causes of foggy weather

1, radiation cooling: at night, a lot of heat is lost on the ground, which leads to the decrease of the ground temperature. The air near the ground also cools down, and the water vapor in the air condenses into water droplets, forming a radiation fog. This kind of fog usually forms on clear and windless nights and often appears in the morning.

2. Sea-land breeze: In coastal areas, the temperature of the ocean changes little, while the temperature of the land changes greatly. At night, the land radiation cools down quickly, and the water vapor in the air condenses to form fog. During the day, the land heats up faster and the fog dissipates.

3. Cooling process: In the process of cold air going south, the temperature gradually decreases, and the water vapor in the air condenses into water droplets and forms fog. This fog is usually accompanied by precipitation and cooling.

4. Water source: Close to lakes, rivers and other waters, there is more water vapor in the air, which is conducive to the formation of foggy weather.

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