Home >> Experiment Case Overview BST=UTC+8h;BST is earlier than the local solar time of Guangdong province by approximately 11-41 minutes.
Case No. Time Period(UTC) Case Description ImagesView
Case9
Radar Mosaic CR
Surface Rainfall Distribution
Satellite TBB
Lightning Flash
2016-05-20 00
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2016-05-21 06
During 20-21 May 2016, widespread rainfall occurred over Guangdong and the east part of Guangxi, with three centers (>100 mm) located in the southeast of Guangxi, the central coastal area of Guangdong, and the north of Guangdong, respectively. In the morning on 20 May, a widespread southwest-northeast oriented rainband extending more than 500 km moved southeastward towards the coasts. Meanwhile, new convections were continuously initiated over the central coastal area of Guangdong, exhibiting a back-building pattern. Around the noon on 20 May, these convective elements merged with the southeastward advancing rainband and then dominated almost the entire Guangdong in the afternoon. At night, most of the precipitation inland weakened and dissipated, but the rain belt along the coastline of Guangdong intensified with reflectivity >40 dBZ and sustained until the midnight. From the early morning on 21 May, the rain belt along the coastline and the precipitation inland moved eastward gradually and left Guangdong in that afternoon.
Radar Mosaic CR
Surface Rainfall Distribution
Satellite TBB
Lightning Flash
Case8
Radar Mosaic CR
Surface Rainfall Distribution
Satellite TBB
Lightning Flash
2016-05-08 19
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2016-05-10 06
During 0300 BST 9 May to 1400 BST 10 May 2016, widespread rainfall exceeding 50 mm occurred in the central and northern parts of Guangdong Province, with the heavy precipitation of 100-200 mm fell over the Pearl River Delta area exhibiting a northwest-southeast oriented rainband. During the early morning to the midday on 9 May, convective cells were continuously initiated in the northern edge of the Pearl River Delta area, exhibiting a back-building pattern. Meanwhile, two groups of convective clusters were initiated in Guangxi and entered Guangdong in two directions. The convection in the southwestern Guangdong moved southeastward and dissipated quickly around noon on 9 May. The northern group which moved eastward intensified when they entered Guangdong and dominated the north of Guangdong until the late afternoon (1600-1700 BST 9 May). Around 2100 BST, there was an elongated rainband extending more than 400 km from the eastern Guangxi to the northern Guangdong and moving southeastward. The precipitation intensified sharply when the rainband entered the Pearl River Delta area. It exhibited a northwest-southeast oriented convective rainband with reflectivity > 50 dBZ, and it stayed in the central Guangdong from early morning to early afternoon on 10 May, contributing greatly to the heavy rainfall in the Pearl River Delta area.
Radar Mosaic CR
Surface Rainfall Distribution
Satellite TBB
Lightning Flash
Case7
Radar Mosaic CR
Surface Rainfall Distribution
Satellite TBB
Lightning Flash
2015-05-19 12
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2015-05-20 07
On 20 May 2015, the 24-h (2000 BST 19 May-2000 BST 20 May) accumulated rainfall (>100 mm) exhibited a northwest-southeast oriented band, with 10 stations exceeding 250 mm and 4 stations exceeding 400 mm. The maximal daily precipitation was observed in the east coast of Guangdong Province, with the maximum amount of 542 mm. At about 2000 BST 19 May, there were several isolated convective cells initiated near the coast. The continuously initiated convection and subsequent upscale growth of the convective cells led to the formation of a quasi-west-east-oriented, elongated MCS within 2 hours. This MCS matured at about 0300 BST 20 May, and then, it stayed quasi-stationary until 1200 BST 20 May, contributing to about 80% of the total accumulated precipitation. During this period, several southwest-northeast-oriented rainbands of meso-β scale within the MCS were formed and sustained a relatively long period (about 2-7 hours). These parallel aligned rainbands (rainband training; Luo et al., 2014) moved slowly eastward along the MCS, repeatedly affecting the east coast of Guangdong and producing the extreme precipitation there. The MCS dissipated after merging with another MCS coming from the northwest.
Radar Mosaic CR
Surface Rainfall Distribution
Satellite TBB
Lightning Flash
Case6
Radar Mosaic CR
Surface Rainfall Distribution
Satellite TBB
Lightning Flash
2014-05-22 14
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2014-05-23 12
On 23 May, the daily precipitation exceeding 50 mm day-1 showed a broad band extending from northern Guangdong southeastward to the coastal region from Hong Kong to Shanwei, with the precipitation of more than 200 mm day-1 located mostly over central Guangdong and its coasts . The extreme-rain-producing MCS consisted of numerous well-defined, southwest-northeast-oriented band-shaped convective precipitation regions with reflectivity >35 dBZ (simply referred to herein as rainbands) during its life span , exhibiting “band training” of the rainbands along the MCS (Luo et al. 2014). The rainbands, with a length of about 50 km, appeared quasi-stationary and moved little, continuously generating rain over the same areas for nearly 20 hours (i.e., 0030-2030 BST). The rainband-training organization of extreme-rain-producing MCS has recently been noticed in central East China during the Meiyu season (Luo et al. 2014), in western Guangdong coastal area on 10 May 2013 (Wang et al. 2014), and in eastern Guangdong coastal area on 20 May 2015 (Wu and Luo 2016).
Radar Mosaic CR
Surface Rainfall Distribution
Satellite TBB
Lightning Flash
Case5
Radar Mosaic CR
Surface Rainfall Distribution
Satellite TBB
Lightning Flash
2014-05-21 16
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2014-05-22 14
On 22 May, widespread precipitation was distributed over Guangdong province except for its southwest portion. However, heavy rainfall of more than 100 mm per day was confined over the northern mountains showing a narrow and nearly west-east-oriented rainband, along which five rain gauges recorded more than 200 mm of daily precipitation. The extreme precipitation was produced sequentially by two MCSs . The first MCS (B1) was initiated around midnight at the windward slope in northern Guangdong, it was rather slow-moving and lasted for about 9 hours (0200-1300 BST). The other MCS (B2) was a squall line that was initiated over northern Guangxi in the late afternoon of the previous day, moved southeastward into Guangdong at about 1100 BST 22 May, and passed across Guangdong in about 11 hours. The quasi-stationary MCS B1 and the fast moving squall line MCS B2, respectively, contributed about 60% and 40% of the total precipitation to this extreme rainfall event in northern Guangdong.
Radar Mosaic CR
Surface Rainfall Distribution
Satellite TBB
Lightning Flash
Case4
Radar Mosaic CR
Surface Rainfall Distribution
Satellite TBB
Lightning Flash
2014-05-10 16
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2014-05-11 16
On 11 May, extreme rainfall occurred over the central coastal area of Guangdong, with more than 200 mm day-1 located mostly around the Pearl River Delta region, while heavy precipitation of 100-200 mm day-1 fell over northern Guangxi. The extreme rainfall along the Guangdong coast on 11 May 2014 was generated mostly by two linearly shaped MCSs that sequentially moved along the coastline from Yangjiang to Shenzhen . The two MCSs had similar organizational characteristics, i.e., consisting of northeastward “echo training” convective cells (Doswell et al. 1996). During their development, new convective cells were continuously initiated at the southwestern periphery of the MCSs, leading to the growth and sustained development of MCSs. Another linear MCS originated in Guangxi and then merged with the locally developed MCS A2 in the late afternoon (about 1700 BST).
Radar Mosaic CR
Surface Rainfall Distribution
Satellite TBB
Lightning Flash
Case3
Radar Mosaic CR
Surface Rainfall Distribution
Satellite TBB
Lightning Flash
2014-05-08 02
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2014-05-08 18
On 8 May 2014, heavy rainfall exceeding 50 mm in a day exhibits a west-east-oriented band extending from southeast Guangxi to the Pearl River Delta area in Guangdong, with the heaviest daily rainfall of 100-200 mm located in the east of the rainband. Numerous convective clusters were observed around southwest Guangdong, southeast Guangxi, and the adjacent ocean to the east of Zhanjiang during late morning to early afternoon hours on 8 May . Although few convective clusters developed over the coastal waters, some developed over the land and grew in length, leading to the formation of a quasi-linear MCS over Guangdong coastal area in the late afternoon. This linear MCS lasted for 10 hours, from 1600 Beijing Standard Time (BST; BST = UTC + 8h) 8 May to 0200 BST 9 May, and contributed to about 90% of the daily rainfall amount over the Pearl River Delta area and its west on 8 May 2014.
Radar Mosaic CR
Surface Rainfall Distribution
Satellite TBB
Lightning Flash
Case2
Radar Mosaic CR
Surface Rainfall Distribution
Satellite TBB
Lightning Flash
2013-05-09 16
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2013-05-10 11
On 10 May 2013, the 19-hr (0000-1900 BST) accumulated rainfall distribution exhibited a narrow band of extreme rain that extended from the southwest (near Mountain Longgao) to the northeast (around Yangjiang city) over the coastal area. Within the northeast portion of this rainband, there were 4 rain gauges that recorded 19-hr accumulative rainfall exceeding 300 mm with a peak of 451 mm. The MCS began its development near midnight (i.e., 2300 BST 9 May) from the initiation of convective cells near the east of Mt. Longgao which is about 30 km southwest from Yangjiang city. Convection was also initiated near 0600 BST by orographic lifting near the east of Mt. Ehuangzhang. Shortly after 0900 BST, the repeated convective initiation not only continued at the southwestern edges of the two mountain-associated rainbands but also started to appear between the edges and 10-20-km further to the east, leading to the formation of 4 rainbands consisting of northeastward moving convective cells. Another MCS moving from the west approached Mt. Ehuangzhang and joined the locally developed rainbands at about 1012 BST. By then, one can see 5 rainbands distributed over and to the west of the control region. During the following few hours, the locations of newly initiated convective cells, i.e., the back building region, propagated southward to outside of the control region, increasing the length of the rainbands. By 1330 BST, all the rainbands weakened considerably and mostly moved to the southeast of the control region. While the locally developed MCS over the control region was weakening, another well-organized MCS entered Guangdong from the west at about 1300 BST and intensified during the following few hours. This MCS consisted of a northeast-southwest-oriented convective line and a trailing stratiform region to the northwest and west of the convective line. The northern portion of the leading convective line approached the control region at about 1510 BST, started affecting Yangjiang city at about 1600 BST, and moved out of the control region in another 1 hr (at 1700 BST). The associated stratiform rains affected the control region for about 2.5 hrs (1600-1830 BST). This fast-moving MCS or squall line contributed about 10%-15% to the total accumulative rainfall over the control region.
Radar Mosaic CR
Surface Rainfall Distribution
Satellite TBB
Lightning Flash
Case1
Radar Mosaic CR
Surface Rainfall Distribution
Satellite TBB
Lightning Flash
2013-05-07 16
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2013-05-08 16
During 0000 BST 8 May to 0000 BST 9 May 2013, heavy rainfall exceeding 50 mm per day was distributed in the Pearl River Delta area in Guangdong, southeast Guangxi, and northeast Guangxi, with the heaviest daily rainfall of 100-200 mm mainly located in the south of the Pearl River Delta area. Convective cells continuously developed in the southwest of Guangdong (approximately located in 111.6oE, 21.9oN) from 0100-1200 BST 8 May. At about 0900 BST, those echo training developed to a large convective cluster with the size of about 200 km×180 km in the horizontal. New cells were continuously initiated in the west end of the cluster, exhibiting a back-building pattern. The cluster moved eastward slowly, contributing most to the heavy rainfall in the Pearl River Delta area.
Radar Mosaic CR
Surface Rainfall Distribution
Satellite TBB
Lightning Flash
Chinese Academy of Meteorological Sciences (CAMS) 
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