Research Article

Observed Change in Sahel Rainfall, Circulations, African Easterly Waves, and Atlantic Hurricanes Since 1979

Figure 9

Number of Atlantic tropical cyclones (TCs) during July–September, for (a) total TCs, (b) AEW-induced TCs, and (c) southern-track AEW-induced TCs. (d)–(f) same as (a)–(c) but for intense TCs of Category 3 and above. The linear trends and slopes are given. All trends are significant at the 95% confidence interval per t-test.
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