When will it rain today? When will it stop?

As of June 20021,10, the weather in Shijiazhuang was sunny without rain.

Shijiazhuang is located at the eastern edge of the Eurasian continent in the middle and low latitudes, close to the Bohai Sea belonging to the Pacific Ocean, and has a temperate monsoon climate. The seasonal variation of solar radiation is remarkable, with frequent high and low pressure activities on the ground, four distinct seasons, distinct cold and summer, and precipitation concentrated in summer and autumn. The dry-wet cycle is obvious, with long summer and winter and short spring and autumn.

It takes about 55 days in spring, 0/05 days in summer, 60 days in autumn and 0/45 days in winter. The annual average humidity of air is 65%. There is little precipitation in spring, and there is often a northerly wind or southerly wind of Grade 4, and the temperature rises rapidly in March and April. In summer, affected by the ocean temperature and humidity airflow, the precipitation in June, July, August and September accounts for 63%-70% of the annual precipitation, and the weather is humid. In the dog days of July and August, the air humidity is as high as 100%.

Influenced by Mongolian high pressure in autumn, it is sunny and rainy, with moderate temperature and pleasant climate, with an average air humidity of 78%. In late autumn, there are many northeast winds and cold waves; In winter, influenced by Siberian cold high pressure, northwest wind prevails, the climate is cold, the weather is sunny, and it is cloudy and often snows.

Formation of rain

When the cloud reaches a certain thickness, the water droplets that make up the cloud naturally fall to form rain. Rain is the water on the earth after being irradiated by sunlight, which forms water vapor and evaporates into the air. When it meets cold air in the air, water vapor condenses into water droplets.

Condensation releases heat and raises the temperature, so the warm air will continue to rise, and when it is cold again, the water vapor will continue to condense, and so on. The updraft can extend from low altitude to 10,000 meters.

At higher altitudes, when the temperature is below 0℃, ice crystals will appear, and small water droplets and ice crystals will form cumulonimbus clouds. When the cumulonimbus cloud reaches the tropopause, the upward movement stops.

When the ice crystals in the cloud collide and fuse with each other, part of the water vapor directly condenses and adheres to the surface of the ice crystals, and small ice crystals will grow up. When the updraft supports it, it will fall under the action of gravity. In the process of falling, the low-altitude temperature rises and the ice crystals melt, which becomes rainfall.