The cold air activity is frequent in the coming week, and the drought in Huanghuai in North China continues.

First, the weather in the past week

In the early part of the past week (December 20 to 23), foggy weather occurred in the southern region; after the cold weather from 10 to 16 days, from 22 to 26, strong cold air once again invaded most of China, and the central and eastern regions appeared. Dramatic cooling, Xinjiang and the Northeast, Jiangnan and other places have obvious rain and snow weather (Figure 1).

Figure 1 National precipitation map (December 20, 2010, 20:00 to 26:00)

(1) Most of China's regions are once again exposed to cold air, and some areas are more obvious in cooling and precipitation.

1. Strong winds and cool weather in most parts of China

After the cold wave weather in mid-December, from 22 to 26, most of China's regions experienced strong winds and cool weather. The average daily temperature in most areas has dropped by 6 to 10 °C, with temperatures ranging from 12 to 16 °C in the northern part of Xinjiang, central Inner Mongolia, Jilin, eastern and southern Liaoning, and northeastern Shandong (Fig. 2); There are 5 to 7 northerly winds. Affected by cold air, some regions in Inner Mongolia, North China and Shandong have the lowest temperature since winter; the lowest daily temperature in Hubei, central and northern Hunan, Anhui, northwestern Jiangsu, Jiangsu and northern Zhejiang has dropped to 0 °C. Below; the sea ice cover area in Liaodong Bay has increased significantly, and sea ice has also appeared in the northern part of the Yellow Sea.

Figure 2 The maximum daily temperature range of the national average temperature (December 21 to 25, 2010)

2. Strong snowfall in Xinjiang, rain and snow again in the south

From December 20th to 26th, there was strong snowfall in the northern Xinjiang and the Tianshan Mountains. The cumulative snowfall in most areas was 5-15 mm, the Tacheng area was 20-30 mm, and the Yumin snowfall was 42 mm. It appeared in the 20th to 23rd; snowfall occurred in eastern Inner Mongolia, Heilongjiang and central and eastern Jilin. The cumulative snowfall in northern Heilongjiang was 5-15 mm, and Fuyuan reached 28 mm (Fig. 1). At 08:00 on the 26th, the depth of snow in the northern part of Xinjiang and the northern part of Heilongjiang is 20 to 40 cm, and the local area is 50 to 60 cm.

Affected by the cold air in the south, from the 23rd to the 25th, there were obvious rain and snow in the southern part of the country. Among them, there were rains and snow or sleet in central Guizhou, southern Hubei, Hunan, Jiangxi and Zhejiang, and the cumulative precipitation in most parts of the south was 10 ~25 mm

In addition, from the 23rd to the 24th, snowfall or sleet of less than 10 mm occurred in the central and southern Gansu, southwestern Shaanxi, and western Henan, which is beneficial to alleviate the local drought. In the meteorological arid regions of North China and Huanghuai, only southern North China Local precipitation of less than 2 mm occurred, and drought in most areas continued.

(2) Heavy fog weather occurred in most parts of the southern part of last week

From December 20th to 23rd, fogs with visibility less than 1000 meters appeared in the eastern and southern parts of the southwestern region, Jianghan, most of the south of the Yangtze River, and Guangxi, including parts of the Sichuan Basin, southern Yunnan, central and northern Hunan, and northwestern Fujian. Visibility is less than 200 meters.

Second, the weather forecast for the next week

(1) Precipitation and temperature trend forecast

It is estimated that in the next week, the snowfall in northern Xinjiang, eastern Inner Mongolia and northeastern China will generally be 1 to 5 mm, including 10 to 15 mm in the northwestern part of Xinjiang and the central and eastern parts of Heilongjiang; southeast, southwest, and southwest of northwestern China. The precipitation in the west and northwestern China is generally 2 to 5 mm, and precipitation in some parts of southwestern Tibet, southeastern Sichuan, southeastern Chongqing, and northwestern Guizhou is 10 to 20 mm (Fig. 3).

Figure 3 National Precipitation Forecast Chart (December 26, 2010 to January 1, 2011)

In the coming week, the cold air affecting China is strong. The average temperature in most parts of central and eastern China is 1~2°C lower than normal. The eastern part of Inner Mongolia and the southeastern part of China are about 3°C ​​lower.

(2) Main weather processes

From the 26th to the 27th, there were small to medium snows in northern Xinjiang, northeastern Inner Mongolia, and most of the northeastern regions. Among them, there were medium to heavy snow in the northwestern part of Xinjiang and northeastern Heilongjiang, and local snowstorms.

From 28th to 31st, affected by strong cold air, most of the northwestern region, central and southern China, Huanghuai, Jianghuai, Jianghan, Jiangnan, South China and the southwestern region will have a temperature drop of 6-10 °C, including the eastern part of the northwest. The temperature drop in the areas of Huanghuai, Jianghuai, Jianghan, and Jiangnan is 12~14°C, and the local area can reach 16°C. Small to medium snow will appear in the north of Xinjiang, the central and eastern Inner Mongolia, the north central part of Northeast China, the Shandong Peninsula, and the southwestern part of Tibet. Among them, the northeastern part of the Shandong Peninsula, the Xinjiang Tacheng and the Ili River Valley have medium to heavy snow, Tibet. There are large blizzards in the southwestern part of the country; in addition, there are light rains (snow) or sleet in southern Sichuan, Chongqing, Guizhou, northern and eastern Yunnan, western Hunan, and western Guangxi; there is no significant precipitation in most other parts of central and eastern China. Affected by cold air, most of the above areas will be accompanied by 4 to 6 northerly winds, including 8 to 9 winds in the Shankou area of ​​Xinjiang, 7 to 8 winds in the rivers and rivers, and 30 to 31 in the east and south of China. The sea area will have 7 to 8 grades, and the gusts will be 9 to 10 northerly.

On January 2nd, another strong cold air began to affect Xinjiang. After 3 days, it will bring strong winds and cool weather to most parts of China. There are small to medium snow in the northeastern part of Xinjiang and the southwestern part of the southwestern part of China. There is little to moderate rain (snow) in the northwestern part of South China.

In the coming week, there will be no obvious precipitation in the arid regions of the northwestern region, central and southern North China, and Huanghuai, and the drought will continue to develop.

Third, attention and recommendations

The strong cold air from 28th to 31st will bring strong winds and cool weather to most parts of China, and there will be strong snowfall in Xinjiang, Tibet and Shandong. Relevant localities and departments need to strengthen their prevention of adverse impacts on transportation, power supply and heating, agriculture, animal husbandry and people's lives.

The Bohai Sea and the Yellow Sea should pay close attention to the changes in ice conditions and prevent the adverse effects caused by sea ice.

The drought in most areas such as North China and Huanghuai will continue. The winter wheat area needs to strengthen field management, and adopt measures such as suppression, fertilization and cover to protect against drought and freeze, so as to ensure winter wheat safely.

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