Fig.1

Distributions of accumulating precipitation from 08:00 on August 2 to 08:00 on August 3 (a), radar reflectivity with a time-latitude cross-section along 117°E from 17:00 on August 2 to 02:00 on August 3 (b), and hourly precipitation from 20:00 to 21:00 on August 2 (c), 2017"

Fig.2

Distributions of radar composite reflectivity at 20:00 (a), 20:12 (b), 20:24 (c), and 20:36 (d) on August 2, 2017"

Fig.3

Distributions of potential height at 500 hPa, stream field and special humidity at 20:00 (a), products of cloud driving wind from FY-2G satellite at 19:30 (b) on August 2, 2017"

Fig.4

Distributions of stream field, dew point temperature observed using automatic stations at 19:00 (a), 20:00 (b), and combined reflectivity observed using Tanggu radar in Tianjin at 20:42 (c) on August 2, 2017"

Fig.5

Distributions of pressure and wind field at 303 K isentropic layer (a), cross-section of radial velocity along the line segment in Fig 3c (b), a cross-section of disturbance temperature along southeast (121°E, 35°N)- northwest (113°E, 43°N)(d) at 20:00, and time-height cross-section of wind field observed by wind profiler from 20:24 to 22:42 (c) on August 2, 2017"

Fig.6

Distributions of a baroclinic item of moist potential vorticity (MPV2) at 925 hPa (a), cross-section of pseudo equivalent temperature along 117°E (b) at 20:00, vertical shear between 200-1000 meters (c), and vorticity at 1000 meters (d) based on the VDRAS data at 20:06 on August 2, 2017"

Fig.7

Distributions of radar composite reflectivity at 20:00 (a), 22:00 (b), and 23:00 (c) on August 2 and at 00:00 on August 3 (d), 2017"

Fig.8

Distributions of stream field, dew point temperature observed using automatic stations at 21:00 (a), 22:00 (b), and 23:00 (c) on August 2 and at 00:00 on August 3 (d), 2017"