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Strong, dry northerly winds helped to move the ITF well south of the climatology mean position resluting in below−average rainfall across much of central Sudan

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From September 21−30, 2011, the ITF rapidly progressed south across Africa after a somewhat stalled southward progression during the previous dekad. The mean western portion of the ITF was located approximately at 16.1 degrees North which was 0.5 degrees south of the climatology mean and 2 degrees south of the second dekad position of the ITF. Weak southerly winds and strong northerly winds helped push the ITF south across West Africa. The eastern portion of the ITF was apporoximated at 13.6 degrees North, which was south of the climatology mean across eastern Africa by 1.1 degrees and 2 degrees south of the second dekad position of the ITF. Strong, dry northerly winds helped to move the ITF well south of the climatology mean position resluting in below−average rainfall across much of central Sudan.

Figure 1 shows the current ITF position relative to the climatology position for the third dekad of Septemer and its previous position during the second dekad of September. Figures 2 and 3 are time series, illustrating the latitudinal means of the western and eastern portions of the ITF, respectively, and their evolutions since the start of April.

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