The forecast through September indicates that water deficits will shrink and downgrade overall, leaving moderate to severe deficits across the north and generally milder deficits in the south, punctuated by more intense pockets. Areas of exceptional deficit include Ethiopia west of Addis Ababa, coastal Côte d’Ivoire, southeastern Nigeria, and pockets of Zambia, Zimbabwe, and Botswana. Surpluses are forecast in Tanzania, Uganda, and south of Durban and west of Johannesburg, South Africa.
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The forecast through May indicates that water deficits will downgrade, with moderate anomalies throughout most of the continent, some pockets of greater intensity, and surpluses in Tanzania. Exceptional deficits are forecast in the Ethiopian Highlands. Other areas of significant deficit include Equatorial Guinea, Lesotho, Guinea-Bissau, central Republic of the Congo, eastern Angola, western Zambia and central Zambia and along the Zambezi River, and northern Zimbabwe.
The forecast through April indicates that water deficits will downgrade in the southern half of the continent, becoming primarily moderate across the central breadth and mild in the south. Deficits in the north will increase and intensify, with moderate to extreme deficits in the Sahara and deficits reaching exceptional intensity in parts of the Sahel and into western Ethiopia. Intense deficits will linger in Cameroon, Equatorial Guinea, and Gabon. Surpluses will persist in western Tanzania.
The April 2018 Outlook indicates wetter than normal conditions in India, East Africa, and northwest Brazil. Significantly warmer than normal temperatures are forecast for Far East Russia and Alaska, much of eastern China, particularly the Yangtze River Basin from Shanghai to Chongqing, and eastern Australia from Brisbane to Canberra.
A notable improvement is forecast for southern Africa and the Horn of Africa where conditions will transition from intense to mild water deficit. Intense deficits are, however, forecast scattered across the southern Sahara and the Sahel, and in a stretch from southern Democratic Republic of the Congo through eastern Zambia into Malawi. Deficits of varying severity remain dominant in many other regions, but surpluses are forecast for northeastern South Sudan and Tanzania, and will be exceptional in Tanzania. After April, severe deficits will emerge across northern Africa and will persist in Zambia.
Most areas of exceptional water deficit will downgrade through March. Moderate deficits are expected across northern Africa, with more severe conditions in Morocco, Western Sahara, and Guinea-Bissau. Intense deficits are also forecast for southeastern Nigeria, southwestern Cameroon, Equatorial Guinea, and Gabon. Intense deficits will retreat in southern Africa. Surpluses will linger in southern Sudan, northeastern South Sudan, Tanzania, northern Mozambique, and northern Madagascar. After March deficits in northern Africa will intensify, but south of the Sahara milder conditions will prevail.
The extent of exceptional water deficits is expected to diminish considerably after September, though deficits of varying severity will remain in the forecast and will likely be more severe in the northern half of the continent. In the near-term, July through September, severe to exceptional deficits are forecast in the desert regions of the northern nations, Algeria, Libya, Egypt, northern Niger, and northern Sudan; and also in Equatorial Guinea and Gabon. Exceptional deficits will retreat in southern Namibia during this period but will emerge in the northeastern portion of the country, eastward into neighboring Botswana and across the border into South Africa. Exceptional surpluses are forecast to continue in eastern Tanzania though September but will retreat to the coast by December.
Severe to exceptional water deficit conditions are expected to continue in the desert regions of the northern nations, Algeria, Libya, Egypt, northern Niger, and northern Sudan. Gabon, Botswana and Madagascar are also expected to experience exceptional deficit conditions in the near term. Surpluses in Tanzania may shift southward in the out months entering early 2018. While conditions moderate across sub-Saharan Africa, there are indications that moderate to severe deficits may develop across the Sahel and northern Chad and Sudan in the December through February 2018 period.
Severe to exceptional water deficits are forecast across northern Africa, Gabon, central Republic of the Congo, and western Madagascar through July or longer. Moderate to severe deficits are expected in northern Cameroon, eastern Central African Republic, southwestern Ethiopia, western Kenya, Democratic Republic of the Congo, Rwanda, Burundi, Angola, and northern Mozambique. Exceptional surpluses are expected to emerge in northeastern and coastal Kenya, and to re-emerge in south-central Sudan. Surpluses of varying intensity are forecast to persist in southeastern Tanzania, western Zambia, northern Botswana, Zimbabwe, and along South Africa’s border with Botswana. After July deficits in the north will persist, though diminish slightly in intensity and extent.
Regions likely to have significant water deficits for the 12-month period from February 2017 through January 2018 include: Florida (US), Brazil, northern Chile, French Guiana, Finland, Estonia, Latvia, northern Africa, Gabon, Saudi Arabia, Qatar, Papua New Guinea, and Tasmania (Australia). Water surpluses are forecast for: Idaho (US), La Pampa (Argentina), western European Russia, eastern Romania, southeastern Tanzania, the Volga River Basin, between the Ob and the Tom Rivers (Russia), and Kazakhstan. This Watch List is based on ISciences Water Security Indicator Model (WSIM) Global Water Monitor and Forecast issued 9 May 2017.