Table 2 Correlations among 3 groups of parameters.

Correlation	PDI group				Circulation group				TC-atm. group (genesis region)
	PDI			N	I	Easterly	SHAI	SHII	ZVWS	Vor.	1st lon	1st lat
PDI group
PDI	1.00	0.86	0.72	0.43	0.58	−0.83	−0.77	−0.72	−0.79	0.64	0.77	−0.45
	0.86	1.00	0.83	0.50	0.29	−0.68	−0.60	−0.63	−0.71	0.70	0.88	−0.76
	0.72	0.83	1.00	0.89	−0.06	−0.67	−0.67	−0.75	−0.71	0.57	0.76	−0.69
N	0.43	0.50	0.89	1.00	−0.31	−0.51	−0.57	−0.66	−0.56	0.37	0.51	−0.49
I	0.58	0.29	−0.06	−0.31	1.00	−0.49	−0.45	−0.22	−0.36	0.25	0.25	0.12
Circulation group
Easterly	−0.83	−0.68	−0.67	−0.51	−0.49	1.00	0.90	0.78	0.91	−0.68	−0.61	0.42
SHAI	−0.77	−0.60	−0.67	−0.57	−0.45	0.90	1.00	0.91	0.83	−0.44	−0.61	0.32
SHII	−0.72	−0.63	−0.75	−0.66	−0.22	0.78	0.91	1.00	0.79	−0.46	−0.64	0.38
TC−atm. group (genesis region)
ZVWS	−0.79	−0.71	−0.71	−0.56	−0.36	0.91	0.83	0.79	1.00	−0.79	−0.74	0.60
Vor.	0.64	0.70	0.57	0.37	0.25	−0.68	−0.44	−0.46	−0.79	1.00	0.72	−0.69
1st lon	0.77	0.88	0.76	0.51	0.25	−0.61	−0.61	−0.64	−0.74	0.72	1.00	−0.73
1st lat	−0.45	−0.76	−0.69	−0.49	0.12	0.42	0.32	0.38	0.60	−0.69	−0.73	1.00

lat, latitude; lon, longitude; PDI, Power Dissipation Index; SHAI, subtropical high area index; SHII, Subtropical High-Intensity Index; TC-atm., TC-atmosphere; Vor., Vorticity.
Correlations among the PDI, circulation and TC-atmosphere groups of parameters, based on observations in 1993–2012. The PDI group consists of PDI-related parameters including PDI, (duration), (case number × duration), N (case number) and I (intensity). The circulation group consists of three parameters related to the large-scale circulation at 850 hPa, including the easterly wind, SHAI and SHII. The typhoon-atmosphere group at the genesis region consists of typhoon-related atmospheric parameters, including ZVWS (zonal vertical wind shear), 850 hPa vorticity, genesis longitude and genesis latitude. This table is part of the large 23 parameter by 23 parameter table in Supplementary Table 2.

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