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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Rio Grande do Norte
Exceptional water deficits are forecast to diminish considerably over the next three months except in the western Amazon Basin in Brazil and Acre, Rondônia, Mato Grosso, and Tocantins. Deficits are also expected across Brazil’s Northeast region. Elsewhere on the continent, intense deficits are expected in western Bolivia and the Gulf of Corcovado, Chile. Areas of surpluses include central Colombia; Mato Grosso do Sul, Brazil; and La Pampa Province, Argentina. After February widespread surpluses will emerge in the northern Amazon Basin and Venezuela, Guyana, and Suriname.
The near-term forecast indicates that widespread water deficits will persist, though moderate, in Brazil. However, intense deficits are forecast for: Brazil’s far north into Suriname and French Guiana; Ceará and Rio Grande do Norte; north-central and southern Venezuela; Cochabamba, Bolivia; northern Chile; and Tierra del Fuego. Surpluses will persist in La Pampa and Buenos Aires Provinces, Argentina, and will emerge in Uruguay. After November deficits will retreat to eastern Brazil and surpluses will emerge in the northern Amazon Basin.
Regions forecast to have significant water deficits for the 12-month period from June 2017 through May 2018 include: Montana (US), Nayarit (Mexico), Amapá (Brazil), Italy, the Arabian Peninsula, Madhya Pradesh and Chhattisgarh (India), Cambodia, Mongolia, and Tasmania (Australia). Water surpluses are forecast for: US Gulf Coast, La Pampa (Argentina), Tanzania, Bangladesh, Tripura and Mizoram (India), western Myanmar, Laos, Jiangxi and Guangxi (China), and Transvolga (Russia). This Watch List is based on ISciences Water Security Indicator Model (WSIM) Global Water Monitor and Forecast issued 8 September 2017.
The February 2017 Outlook indicates much warmer than normal temperatures for France, Germany, United Kingdom, Scandinavia, Myanmar, and north-central Mexico, along with warm anomalies of varying severity in many other places. The Central Amazon Basin should see much wetter than normal conditions.
Over the next few months South America is forecast to transition away from widespread exceptional water deficits. However, from October through December exceptional deficits are forecast along Brazil’s northeastern coast, along with many parts of Chile, Tierra del Fuego, and the Falkland Islands. Surpluses of varying intensity are forecast in central Colombia, northern Peru, northern Bolivia, central Brazil, and northwestern Argentina. From January through March northern Brazil is forecast to transition from deficit to moderate surplus.