Fig.1

Partition map of Liaoning province"

Fig.2

Spatial distribution of interannual variation trend (a) and variation of time series (b) of precipitation in summer from 1999-2018 in Liaoning province"

Fig.3

Time series of standardized precipitation in different areas (S1, S2, S3, and S4) of in summer from 1999-2018 in Liaoning province"

Fig.4

Spatial distribution of water vapor flux and water vapor content in summer from 1999-2018"

Table 1

Correlation of water vapor flux at different borders and net water vapor flux in zonal and meridional directions with the precipitation in Liaoning province in summer from 1999-2018"

Fig.5

Average potential height at 500 hPa in summer from 1999-2018"

Fig.6

Vertical shear field of zonal wind (a) and the correlation between the westerly index and meridional water vapor flux at different longitudes (b) in summer during 1999-2018 in Liaoning province"

Table 2

Trends of the westerly index at different longitudes in summer from 1999-2018"

Table 3

Correlation of the area, intensity, ridge, line, and extension point of the western Pacific subtropical high with the meridional water vapor flux in Liaoning province in summer from 1999-2018"

Fig.7

Spatial distribution of the correlation between ridge position of western Pacific subtropical high and meridional water vapor flux (a) and the variation of time series of ridge position of western Pacific subtropical high (b) in summer from 1999-2018"

Fig.8

Spatial distribution of the correlation between meridional water vapor flux and precipitation (a) and interannual variation trend of meridional water vapor flux (b) in summer from 1999-2018"

Fig.9

Vertical distribution of meridional-mean meridional water vapor flux (a) and interannual variation trend of meridional water vapor flux(b) in Liaoning province in summer from 1999-2018"

Fig.10

Vertical distribution of zonal-mean meridional water vapor flux (a) and interannual variation trend of zonal-mean meridional water vapor flux (b) in Liaoning province in summer from 1999-2018"

Fig.11

Vertical distribution of the correlation between meridional-mean (a), zonal-mean (b) water vapor flux and precipitation in Liaoning province in summer from 1999-2018"