Fig. 2. Locations of 38 rainfall stations that make up the western Sahel
precipitation index, as well as the 24 Gulf of Guinea precipitation stations.
August-toNovember rainfall within the Gulf of Guinea region shows a predictive
signal for western Sahel rainfall and hurricane activity during the following
season. June-July rainfall in the western Sahel region provides a strong
predictive signal for the following Augustthrough-October hurricane activity
(see Landsea 1991).