Abstract
On the night of April 20, 2017, there was a heavy rain in Longyan City, accompanied by strong convective weather such as strong lightning, short-term heavy precipitation, and 6 - 8 thunderstorms. The three-hour rain intensity and the six-hour rain intensity of Shanghang Tongxian Township and Nanyang Town were once in a century. Through the use of radar, radar wind profile and lightning locator data, the process can be divided into two phases: The first stage is the strong precipitation stage of Changting Datong Town during the 20 - 22 periods on the 20th. The process is accompanied by short-term heavy precipitation (59.7 mm/h), strong lightning activity, and 6 - 8 thunderstorm gales. It is a convective cold cloud dominated precipitation. The second stage is the strong precipitation stage of Shanghang Tongxian Township on the 21st, 02 - 04, and the short-term strong precipitation intensity reaches 75.7 mm/h, but the lightning and wind activity are weak, which is the convective warm cloud-oriented precipitation. There are significant differences in the strong convective weather between the two phases in the same background. The analysis shows that the strong echo of the first stage radar (above 60 dBz) is block-shaped southward, the speed of movement is fast, the height of the echo top is high, and the rear nascent monomer forms a train effect. In the second stage, the southwest-northeast-oriented convective zone moves to the northeast direction, forming the train effect of the echo zone. The center intensity is above 50 dBz, the echo top height is low, and the precipitation center moves slowly. This caused a large amount of accumulated rainfall. In this paper, the radar data is used to analyze the heavy rainfall process on the west coast of the straits, which has certain indication significance for the predictability of strong convective weather.
Highlights
From the night of April 20, 2017 to the 21st, there was a heavy rainstorm in Longyan City
On the night of April 20, 2017, there was a heavy rain in Longyan City, accompanied by strong convective weather such as strong lightning, short-term heavy precipitation, and 6 - 8 thunderstorms
The analysis shows that the strong echo of the first stage radar is block-shaped southward, the speed of movement is fast, the height of the echo top is high, and the rear nascent monomer forms a train effect
Summary
From the night of April 20, 2017 to the 21st, there was a heavy rainstorm in Longyan City. The precipitation process lasted for a short time, but the accumulated rainfall was large, and the local convection developed strongly. According to statistics (Figure 1), from 20 o’clock on the 20th to 20 o’clock on the 21st, the city (excluding the traffic station) has a total of 52 regional stations with accumulated rainfall exceeding 50 mm. There are 8 regional stations over 100 mm, with 195.0 mm being the largest in Shanghang Tongxian Township and 192.1 mm in Nanyang Town. The three-hour rain intensity of Shanghang Tongxian Township reached 151.2 mm, the rain intensity reached 60.8 mm in 6 hours, the rain intensity in Nanyang Town reached 146.5 mm, and the rain intensity reached 69.3 mm in 6 hours. The three-hour rain intensity and the six-hour rain intensity of these two stations were once in a century
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