Many expressway in Hebei Province were closed due to heavy fog. Why is there so much fog in the north?

Not only in Hebei, but also in the whole north.

Why?

When the spring is warm, the temperature rises suddenly, and the cold hidden in the ground begins to rise slowly, so fog is formed.

First, even at noon, you can see the underground water vapor slowly rising to the ground.

Last year's snow fell to the ground and turned into water and slowly infiltrated into the ground, but if it is warm today, the snow water around the world will gradually turn into fog and return to the sky. Only in the north can it look like spring and the snow will be clean. The snow on the top of the mountain will flow to the bottom of the mountain, and the fields under the mountain will be harvested.

The fog in the morning is the breath brewed by the earth all night, just like we yawn and stretch in the morning. In fact, the earth is alive, and fog is his breath. Really, I won't play with you.

Second, the fog in the north lasts for a long time, and the fog is still struggling when the sun comes out.

Fog is directly proportional to clouds. If there are more clouds in the north in spring, there will be more fog and vice versa. I feel like the clouds in the sky are calling the fog on the ground. The cloud stretched out its index finger in the sky and shouted at the fog. Come here ~ Then the fog slowly emerged from the ground, invisible and everywhere.

Haha, jokes aside, in fact, it's not all foggy in the north. Where there are mountains, there is more fog. Of course, except Beijing, the fog in Beijing is not clean. Fog clouds in other places disappeared after sunrise.

Third, this is a long process, because too much snow water has infiltrated into the ground and frozen for a winter, so this is the earth's slow awakening.

The bark of poplar is white in winter in the north. Spring has come, and it slowly returns to turquoise, which is vitality. At the same time, it is also the time when the fog rises. Fog is a kind of warmth, and the temperature rises. I think you can wear short sleeves in less than a week. There are four distinct seasons in the north, unlike spring and autumn in the south.

By the way, in foggy days, try to reduce going out. When going out, you must go on the road. The line of sight on the road is limited, which is prone to unnecessary danger or property loss. The front car can't see the rear car, and the rear car can't see the front car. There is a layer of fog on the rearview mirror.