Why are there frequent thunderstorms in summer?
In the afternoon or evening of summer, people often feel extremely sultry, and then suddenly thunder rumbles, lightning flashes and thunder rumbles, and it rains heavily, and the sky seems to be angry. However, before long, the thunder went away, the dark clouds dissipated, and the blue sky and white clouds set each other off, which was particularly quiet and beautiful, and the air was particularly fresh. This is a weather phenomenon that we often encounter in summer-thunderstorm.
Thundershower is due to the hot summer weather, and strong air convection occurs in some places, which leads to a large number of hot and humid air rising violently and forming cumulonimbus clouds.
In summer, there is a lot of water vapor in the air. When the ground temperature rises under strong sunlight, the air will rise upwards. After the water vapor is pushed by the strong updraft over 1-2km, a large cumulus cloud is formed. The continuous rise of air can thicken and expand the clouds of cumulus clouds and become thick cumulus clouds. At this time, if there are suitable conditions, the cumulonimbus cloud will continue to develop upwards, rising to the height of 7- 10 km, forming cumulonimbus clouds. When there is a stable gas layer or the upward tensile force is insufficient, the cloud top will spread in all directions. Before a thunderstorm comes, we often see the dark clouds in the sky thicken and spread rapidly, and they will cover the whole sky in a short time.
Thunderstorms often occur in summer because of the strong thermal convection that produces cumulonimbus clouds. Because the cumulonimbus clouds caused by thermal convection are very disturbed, lightning often occurs, and the updraft is sometimes strong and sometimes weak. After one cumulonimbus cloud passed, another cumulonimbus cloud moved over, so the rainfall changed greatly and it was intermittent, so it was called thunderstorm.
On land, the temperature is the highest after noon, and the air ascending movement is also the strongest at this time, so thunderstorms mostly occur in the afternoon to evening.
In the ocean, due to the large specific heat of seawater, the solar energy absorbed by seawater can be transferred to the deep layer. During the day, the temperature near the water surface is not high, and the whole air layer is very stable, so it is not easy to produce convective thunderstorms. At night, the temperature drops at high altitude, but under the influence of the water surface, the low altitude is obviously higher than the high altitude, so the air becomes unstable and convection occurs, thus forming thunderstorms. It can be seen that thunderstorms on land are mostly in the daytime, and thunderstorms on the ocean are mostly at night.