Yesterday was the third day of the "March Nineth," and the maximum temperature at the observatory in the southern suburbs of the city rose to 7.3 °C in the afternoon. On the "<>" day this winter, why is the capital so warm?

Jing Hao, chief forecaster of the Municipal Meteorological Observatory, said that the Beijing was relatively warm yesterday, which was formed by the superposition of many reasons. Yesterday, Beijing was under the control of a warm air mass, and the temperature began to rise, which is the background of the weather. In fact, there is a weak cold air on the day, but the main body of the cold air arrives at night, and during the day, under the disturbance of the north wind, the sinking and warming effect is obvious, but it is very warm; and the temperature rises significantly in the afternoon, which is also because of the influence of the diurnal change of temperature, plus yesterday was a sunny day, the sky is basically cloudless, and the effect of solar radiation is also relatively obvious.

In December 2023, the capital experienced extremely cold weather, why did it become warmer when it entered the "Sanjiu". Jing Hao told reporters that this is mainly because of the recent adjustment of atmospheric circulation. Although the cold air activity is quite frequent, the overall intensity is weak, the impact is northerly, and the speed of activity is fast, which will soon pass, resulting in the overall temperature is higher. Historical data shows that in the past 12 years, the average maximum temperature in Beijing in mid-January was 30.1°C, and the average minimum temperature was -1.7°C. Judging from the current forecast, temperatures in mid-January this year will be higher than the historical average.

However, the power of winter should not be underestimated. According to the forecast of the Municipal Meteorological Observatory, the temperature will drop significantly on Saturdays and Sundays this week, and the maximum temperature is expected to be between 3 °C and 4 °C. Especially under the influence of cold air, the north wind is obvious from Saturday night to Sunday daytime, and the wind chill effect is superimposed on Sunday, and the body feels cold.

■ Reminder

A large area of the river has thawed, let's not walk on the ice

Although it has entered the "39" at present, the ice surface of many wild rivers in the capital is not solid. On the Fengcao River near Jinzhongdu South Road, there are already more water surface areas than ice surfaces, and there are still parents who ignore the danger and warning signs and take their children to play on the ice.

Standing on the bridge on the south side of the auxiliary road of Jinzhongdu South Road and looking down, there is already a large area of melted water on the surface of the Fengcao River, and only a third of the water near the north bank is still covered with a layer of ice. At this time, two children, a man and a woman, were standing on the ice, stretching out their fishing nets to catch up in the water, and jumping around from time to time.

Then, accompanied by her parents, the girl took out a wooden ice cart from the shore and slid back and forth on the ice with two skating sticks, accelerating as her parents followed. Another boy stood on the edge and played, stomping hard from time to time, trying to stomp the ice beneath his feet. The reporter noticed that there are warning signs along the river that "for the safety of your life, please do not go down to the river to play in the water, swim, fish, and skate". However, the children and their parents who played on the ice turned a blind eye.

As the saying goes, "Three-nine-four-nine walks on ice." However, this year's "March Nine" weather is warm, and the hidden danger of wild ice has further increased, reminding the public not to engage in ice activities such as wild ice skating and wild fishing.

Reporter Chu Yingshuo took the article