TITLE:
Comparative Analysis of Strong Convection Process of Convective Cold Cloud and Convective Warm Cloud Type
AUTHORS:
Yue Ni, Yuan Su, Jinqin Feng
KEYWORDS:
Strong Convection, Convective Cold Cloud Dominated Precipitation, Convective Warm Cloud Dominant Precipitation, Oblique Pressure
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.6 No.9,
September
3,
2018
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.