Fig.1

Mode region settings"

Fig.2

FNL final analysis data on 0000 UTC (a) and 0600 UTC (b), and the high-level field on 0600 UTC in pre-assimilation (c) and post-assimilation (d) simulation results on June 23, 2016"

Fig.3

Pre-assimilation (a) and post-assimilation (b) simulated accumulated precipitation at 0300-0900 UTC and observations in Funing region (c) on June 23, 2016"

Fig.4

Radar reflectance factors at 0630 UTC in post-assimilation simulation in Funning region on June 23, 2016"

Fig.5

Radar reflectivity factor, wind at the first model level, and updraft helicity of convective cell 1 at 0820 UTC (a), 0830 UTC (b) and 0840 UTC (c) on the 333 m grid on June 23, 2016 of Funing region"

Fig.6

Radar reflectivity factor, lowest layer wind and updraft helicity of convective cell 1 in two-way (a), one-way(b), black box area of figure 6a (c) and figure 6b (d) nesting on the 111 m grid on June 23, 2016 of Funing region"

Fig.7

Vertical vorticity and wind in the lowest model layer on the 111 m grid during 0828 UTC (a), 0830 UTC (b), 0832 UTC (c) and 0834 UTC (d) on June 23, 2016 of Funing region"

Fig.8

Temporal variations in SRH at 0750UTC in grid resolution of 3 km (a), 1 km (b), 333 m (c) and 111 m (d), 0800 UTC in grid resolution of 3 km (e), 1 km (f), 333 m (g) and 111 m (h), 0810 UTC in grid resolution of 3 km (i), 1 km (j), 333 m (k) and 111 m (l) in Funing region on June 23, 2016"

Fig.9

Temporal variations in the maximum vertical vorticity of two-way and one-way nesting on June 23, 2016"