The forecast through August 2019 indicates moderate water deficits across northern Africa with large pockets of exceptional deficit in Libya, Egypt, and Sudan. The southern Sahara and the Sahel will be near-normal, and deficits in the Horn will downgrade. Mild deficits will cover much of southern Africa, punctuated by surpluses in East Africa and some pockets of intense deficit from Cameroon through Republic of the Congo, in southern Angola, northern Namibia, and western Botswana.
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The forecast through July indicates that water deficits will downgrade in the southern half of the continent and across its midsection from the Gulf of Guinea to the Horn of Africa but will intensify across northern Africa with exceptional deficits expected. Moderate to severe deficits are forecast in the south, with intense deficits in Namibia. Areas of surpluses include Tanzania, northern Madagascar, the mouth of the Congo River, and the northern coast of the Gulf of Guinea.
The May Outlook includes a forecast of exceptional warm anomalies in a number of places including northern Alaska; the State of São Paulo, Brazil and through the Andes from Colombia through northern Chile; and, around the Gulf of Guinea in Africa. Central Tanzania is expected to be much wetter than normal. Widespread, moderate to severe wet anomalies are forecast in a broad path in the U.S. from Michigan through Louisiana.
The forecast through June indicates that water deficits will downgrade in the southern half of the continent and its midsection but will intensify across the north. In the Horn, deficits will downgrade but exceptional deficits are forecast for Somalia from the Jubba River past the Shabelle River. Intense deficits are expected in Zambia, Zimbabwe, southwestern Angola, and the Okavango Delta. Areas of surplus include western Tanzania and south-central Chad.
The forecast through March indicates that water deficits will persist on much of the continent, but the extent of exceptional deficits will diminish considerably. Moderate to severe deficits are forecast across northern and central Africa along with pockets of exceptional deficit. Anomalies will be intense in Nigeria, Sudan, Ethiopia, Somalia, Cameroon, Equatorial Guinea, Gabon, and Lesotho. Mild to moderate deficits are forecast for southern Africa. Intense surpluses will persist in western Tanzania.
Regions forecast to have significant water deficits for the 12-month period from October 2018 through September 2019 include: Quebec (Canada), Finland, Venezuela, Somalia, South Africa, India, Thailand, Cambodia, and Australia. Areas with a forecast of significant water surplus include: Texas (US), Paraguay, Uruguay, Tanzania, and China. This Watch List is based on ISciences Water Security Indicator Model (WSIM) run on 1 February 2019.
Among warm anomalies in the February Outlook the forecast indicates much higher than normal temperatures in Southeast Asia and along China’s southeast coast and in Taiwan. Conditions are expected to be wetter than normal along the lower Yangtze River, in the US Southwest, and around the Gulf of Guinea in Africa.
Though intense water deficits will persist in northern Africa over the next few months, exceptional deficits will shrink in the north and along the Red Sea, and will nearly disappear from the rest of the continent. Intense deficits will persist in Zambia’s Kafue River watershed. Areas of surplus include: Tanzania, Kenya, eastern Uganda, some countries along the northern Gulf of Guinea, central Chad, and northwestern Zambia. Surpluses will be intense in East Africa.
Exceptional water deficits will shrink and downgrade across North Africa and along the Red Sea but deficits will remain widespread and intense. Intense deficits are also forecast for western Ethiopia, southern Gabon, northwestern Botswana, central Zambia, and western Madagascar. Exceptional surpluses will persist in East Africa; extreme surpluses are forecast for the conjoined borders of Cameroon, Central African Republic, and Republic of the Congo; and surpluses of lesser intensity are forecast for westernmost Democratic Republic of the Congo.
Exceptional water deficits in North Africa will diminish but persist, and severe deficits are forecast in Gabon and in Nigeria south of the Benue River. Deficits will also persist in western Zambia and are expected to be extreme on the Kafue River. Moderate to exceptional deficits will emerge in central Botswana. Exceptional surpluses will persist in Tanzania, Kenya, and northern Uganda, but diminish somewhat in northern Madagascar. Surpluses east of Kinshasa in Democratic Republic of the Congo are forecast to increase in both extent and intensity, becoming severe.