West Region	East Region

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From 01-10 of September, the western part of the ITF moved significantly to the south compared to its previous dekad position. In contrast,the eastern part of the ITF moved slightly to the north compared to its previous dekad positon. The western (10W-10E) portion of the ITF was located approximately at 18.1N,which was south to the climatological position centered at 18.8N. This position of the ITF explains the attenuation of rainfall across the far northern part of Senegal, southern Mauritania and central Niger. The eastern (20E-35E) portion of the ITF was located at 16.5N, which was north to the climatological position centered at 16.1N. This position could explain the increase of rainfall across central Chad, central Sudan, Erithrea and northwestern Ethiopia. Figure 1 shows the current position of the ITF relative to the long-term average position during the 1st dekad of September and its previous position during the 3rd dekad of August. Figures 2 and 3 are time series, illustrating the latitudinal values of the western and eastern portions of the ITF, respectively, and their seasonal evolutions since the beginning of April, 2021.

Dekad	15W	10W	5W	0	5E	10E	15E	20E	25E	30E	35E
April 1	11.5	10.6	9.8	9.5	8.7	7.8	6.8	7.3	6.8	6.8	6.8
April 2	11.5	11.6	11.9	11.9	11.1	10.0	9.2	8.6	8.0	7.9	7.8
April 3	11.4	11.9	13.4	12.8	12.7	10.8	10.4	10.2	10.7	11.3	13.4
May 1	10.9	12.7	13.6	13.9	12.9	12.3	12.3	12.2	12.8	12.9	14.5
May 2	12.8	13.0	14.1	14.2	14.1	12.6	13.0	12.0	12.1	12.9	13.4
May 3	12.4	13.1	14.5	14.1	14.0	11.7	11.7	11.5	11.7	11.7	11.6
June 1	14.7	14.6	15.2	14.9	14.9	13.2	13.9	13.3	13.2	13.1	13.0
June 2	14.5	15.4	16.7	17.1	17.3	16.2	15.9	15.1	14.0	14.7	17.1
June 3	15.3	15.8	16.6	17.0	17.7	16.6	15.9	15.2	14.6	15.3	17.3
July 1	16.6	17.1	18.0	17.4	17.4	16.1	16.6	16.5	15.8	15.5	16.6
July 2	16.7	17.1	17.8	18.2	18.0	17.8	18.4	18.4	18.0	18.4	19.4
July 3	18.5	18.1	20.2	20.3	20.4	18.9	18.6	18.2	16.7	16.3	17.2
August 1	19.8	19.6	19.5	20.3	19.4	18.6	19.1	18.5	17.5	18.9	19.8
August 2	19.5	21.3	20.7	19.6	18.7	18.2	18.4	17.8	16.2	15.5	16.5
August 3	19.1	21.0	22.2	21.3	18.5	17.5	17.6	16.3	14.9	15.8	17.3
September 1	18.5	18.8	18.5	17.8	17.0	16.5	17.1	17.0	16.6	17.3	18.1