Table 1 Correlation between typhoon intensification rate and various atmospheric and oceanic variables.

V|200−850, full shear; |Δu|200−850, shear of zonal wind; |Δv|200−850, shear of meridional wind; ζ850, 850-hPa vorticity; ω500, 500-hPa pressure velocity; SLP, sea-level pressure; PIinten, PI over the main intensification region; PIgenesis, PI over the main genesis region defined in ref. (21); RSST, SST over the typhoon intensification region relative to global tropical mean SST; T75m, ocean temperature at 75-m depth; rupper and rlower, the upper and lower bounds, respectively, for a 95% credible interval.

V|u|v|ζ850ω500SLPPIintenPIgenesisSSTRSSTT75m
r−0.170.13−0.03−0.180.070.160.33−0.030.320.090.58
rupper0.100.380.240.090.330.410.540.230.540.350.36
rlower−0.42−0.14−0.29−0.43−0.20−0.110.07−0.300.05−0.180.73