Table 2 Statistics derived from the wind anomaly observed on the first day of a MHW. Statistics are shown in 5 coastal sub-domains and for different MHW duration. The category “5–10 days coastal” regroups MHWs that are located less than 100 km from the coast, the other categories are within \(2.5^{\circ }\) of the shoreline. The last column indicates the number of grid point over which the average is calculated.

Latitude range	Duration range	Average wind anomaly (\(\hbox {m}\,\hbox {s}^{-1}\))	Standard deviation (\(\hbox {m}\,\hbox {s}^{-1}\))	Skewness (\(\hbox {m}\,\hbox {s}^{-1}\))	Number of grid points
2.5–\(6^{\circ}\,\hbox{S}\)	5–10 days coastal	− 0.06	1.06	− 0.06	1593
	5–10 days	0.05	1.13	0.23	2173
	5–30 days	0.10	1.17	0.05	4407
	30–100 days	0.45	1.54	− 1.01	431
	> 100 days	1.41	0.55	− 2.07	308
6–\(10^{\circ}\,\hbox{S}\)	5–10 days coastal	− 0.74	0.62	− 1.43	312
	5–10 days	− 0.28	0.91	0.42	638
	5–30 days	− 0.23	1.16	− 0.51	1633
	30–100 days	− 0.12	1.20	− 0.06	670
	> 100 days	0.92	0.87	− 1.83	499
10–\(14^{\circ}\,\hbox{S}\)	5–10 days coastal	− 1.45	1.44	− 0.67	900
	5–10 days	− 0.94	1.59	− 0.38	1480
	5–30 days	− 0.30	1.64	− 0.35	2569
	30–100 days	–0.44	0.96	− 0.52	918
	> 100 days	0.58	1.23	− 1.34	502
14–\(18^{\circ}\,\hbox{S}\)	5–10 days coastal	− 0.46	1.53	− 1.00	1092
	5–10 days	− 0.64	1.47	− 0.57	1924
	5–30 days	− 0.23	1.32	− 0.45	4962
	30–100 days	− 0.31	1.02	− 0.61	1978
	> 100 days	− 0.11	0.86	− 0.34	675
18–\(25^{\circ}\,\hbox{S}\)	5–10 days coastal	− 0.62	1.41	− 0.19	1914
	5–10 days	− 0.80	1.62	0.12	3933
	5–30 days	− 0.44	1.37	− 0.26	8436
	30–100 days	− 0.59	1.40	− 0.04	3512
	> 100 days	− 0.09	0.63	− 0.93	1271

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