The forecast through May indicates that water deficits in Brazil will shrink and downgrade significantly, though intense deficits are forecast for eastern Minas Gerais, Espíritu Santo, and São Paulo. Surpluses will emerge in northeastern states and will moderate but increase in the south. Exceptional deficits are forecast for Suriname and French Guiana, and deficits of varying intensity for Brazil’s northern neighbors, and Peru, Chile, eastern Bolivia, and Argentina. Surpluses will shrink in northern Bolivia, downgrade in central Paraguay, and moderate in northeastern Argentina and Uruguay.
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South America is forecast to transition away from widespread exceptional water deficits in December. However, from September through November exceptional deficits are forecast across northern Brazil along with moderate deficits reaching southward to Rio de Janeiro. Severe to exceptional deficits are forecast near Caracas, Venezuela; western Bolivia; Chile; rivers in southern Argentina; and the Falkland Islands. Surpluses are forecast in eastern Paraguay, and Paraná and Santa Catarina, Brazil. Overall, water deficit conditions will continue to diminish in extent and severity from December through May.
Regions likely to encounter significant water deficits in the coming months include: Ohio, Pennsylvania, the Missouri and Yellowstone Rivers, southern Mexico, Chile, Central and Eastern Europe, North Africa, Zambia, Saudi Arabia, Yemen, Siberia, Gujarat, Cambodia, South Korea, and Tasmania. Water surpluses are forecast for: Minnesota, Wisconsin, Louisiana; Paraguay; European Russia and the Volga Basin; the Chambal, Yamuna, and Ganges Rivers in India; Bangladesh; western Myanmar; Laos; and the Yellow, Yangtze, and Pearl Rivers in China. This watch list is based on ISciences' Water Security Indicator Model (WSIM) Global Water Monitor and Forecast issued 8 September 2016.
Exceptional water deficits are forecast for much of northern and central Brazil from July into October. From October to December deficits will diminish in central Brazilian states but persist across the north, and widespread deficits will emerge in other countries in northern South America. Deficits will also persist in Peru, Chile, and southern Argentina.