When is the coldest before, during and after the rainstorm?

The rainstorm caused by squall line in summer is the coldest in the rain. Of course, even if the temperature rises afterwards, it may not be fast.

In fact, there are many kinds of rainstorm, but short-term heavy precipitation with obvious temperature change in a very short time is generally caused by squall line. The characteristics of this kind of system when crossing the border are very obvious, such as strong wind and sudden change of wind direction, and some of them can change from static wind (within 5 minutes) to strong wind of 10 m/s; The temperature suddenly drops by 5℃ in 5 minutes, 1 hour 10℃. The pressure change is a little more complicated, and the crossing increases sharply. Within ten minutes, a few hundred pa will go up.

Frontal precipitation is generally divided into cold front precipitation and warm front precipitation. A cold front is a front formed by the cold air behind pushing the warm air in front, so it usually becomes cold after precipitation. The warm front pushes the cold air in front to the warm air in the back, so it is usually cold before precipitation? Thunderstorm precipitation is a strong convective weather. It is the thunderstorm high pressure where the thunderstorm cloud is located, accompanied by downdraft. When the intensity is high, it is a downburst. On the radar map, it shows gust front. Generally, the temperature will suddenly drop, dissipate or move out during the thunderstorm, and then recover, so it will become cold during the thunderstorm and precipitation.

The first cold front is also called slow moving cold front. You can see from its name that its moving speed is not fast, so the air in front of the front rises slowly, and the clouds formed are all layered clouds (nimbostratus Ns, stratocumulus As, cirrostratus Cs, cirrus Ci and cumulus Ac are not described later), and the precipitation is mainly concentrated in front of the front. So we know that the precipitation of the first kind of cold front is concentrated in front of the front, and the cold air is behind the cold front, so the precipitation of the first kind of cold front is mainly cold after rain. (nagging, the so-called autumn rain plus a cold means that cold air activities are frequent in early autumn, and the weather is getting colder and colder from the north to the south again and again. )

The second cold front is an isolated thunderstorm. Before talking about the second kind of cold front, we must first understand the structure of thunderstorms. Thunderstorms are mainly produced in cumulonimbus Cb, which is a mature internal structure of thunderstorms and can produce precipitation. Due to the gravitational drag of precipitation particles and the influence of cloud and water thermal process, there will be a large and strong downdraft area in the precipitation area of mature thunderstorms with low temperature. Sinking air accumulates on the ground, causing the air pressure to rise and X to form one. (Long-winded: In addition to accumulation, the downward airflow will spread around after hitting the ground, forming a strong wind, so it will also blow before the thunderstorm. Thunderstorm high is considered as a mesoscale cold high, which is equivalent to a smaller scale cold front. This cold front is called gust front. So when it rains, there is the cold of isolated thunderstorm. The second cold front is also called fast cold front. Because of its fast moving speed and steep front, the air rises sharply. Usually, the fronts are cumulus clouds and wave clouds (wave clouds: cirrocumulus Cc, Altocumulus Ac, Stratocumulus SC; Cumulus: Cumulus is dominant.