2013 summer climate outlook for West Africa and Sahel

2013 summer climate outlook for West Africa and Sahel

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Published

3 June 2013

West Africa and the Sahel region is not expected to experience severe precipitation deficits during the July-September rainy season, according to the seasonal climate outlook issued the African Centre of Meteorological Applications for Development (ACMAD).

Based on the current state and expected evolution of sea surface and sub-surface temperature patterns over the global oceans and their known relationships with the West African climate, as well as statistical and dynamical model outputs and expert judgment, the precipitation outlook for July-August-September 2013 is as follows:

  • Near Average or above average precipitation very likely over western Sahel (zone I; see diagram) from Mauritania and Senegal to western and central Niger. About 80% to 130% of normal precipitation is expected over much of this zone.
  • Near average or below average precipitation very likely over the Eastern Sahel (zone II) from the Lake Chad area to the middle part of Chad. About 70% to 110% of normal precipitation is expected over much of this area.
  • Near average or below average precipitation very likely along the Guinea coast (zone II) from Cameroon to Liberia. About 80% to 110% of normal precipitation is expected over much of the area.
  • Climatological expectations for the remaining parts of the domain, mean that above, near or below average precipitation is considered equally likely in the absence of strong predictive signals.

“The region is not expected to experience severe precipitation deficits,” according to the Regional Climate Outlook Forum for West Africa, Chad and Cameroon (Prévisions saisonnières climatiques en Afrique de l’Ouest) at its 16th session held from 27 to 31 May 2013 in Abuja, Federal Republic of Nigeria, and coordinated by ACMAD. 

 

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