For the next several months, water deficits will diminish overall but intense deficits are forecast for southern California, the Willamette Valley in Oregon, along the Arkansas River, and western Colorado. Areas of moderate deficit include northern Minnesota and from Missouri to the Gulf. Surpluses are forecast for northern Nebraska, the Black Hills of South Dakota, southern Montana, the Pecos River in New Mexico into Texas, eastern Pennsylvania, Maryland, northern Virginia, coastal North Carolina, and much of Florida from Jacksonville past Lake Kissimmee.
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Regions forecast to have significant water deficits for the 12-month period from March 2018 through February 2019 include: southern Mexico, northern Brazil, North Africa, Europe, Afghanistan, and Southeast China. Areas with a forecast of significant water surplus include: Montana and Idaho (US), Tanzania, Kenya, Uganda, Spain, and Bangladesh. This Watch List is based on ISciences Water Security Indicator Model (WSIM) run on 7 June 2018.
Water surpluses will continue to emerge in southern Michigan and the Ohio River Valley. Exceptional surplus is expected on the Missouri River, western Montana, Idaho, and Washington. Intense deficits will continue in the West and Southwest. Moderate deficits are forecast for Oregon, Kansas, western Oklahoma, and most of Texas west of the Brazos River, with severe conditions in the Panhandle. Missouri, Arkansas, Louisiana, and Mississippi will transition out of deficit, with moderate surplus emerging in Arkansas into surrounding states. Deficits in the Mid-Atlantic States will shrink.
Regions forecast to have significant water deficits for the 12-month period from November 2017 through October 2018 include: California, Nevada, Arizona, Louisiana, Arkansas, Mississippi, Venezuela, French Guiana, Gabon, Mongolia, and Tasmania. Areas with a forecast of significant water surplus include: Ireland, Poland, European Russia, Tanzania, and Philippines. This Watch List is based on ISciences Water Security Indicator Model (WSIM) run on 6 February 2018.
Regions forecast to have significant water deficits for the 12-month period from October 2017 through September 2018 include: Missouri (US), Brazil, Spain, Portugal, Morocco, Turkmenistan, Inner Mongolia (China), and South Australia and Tasmania (Australia). Areas with a forecast of significant water surplus include: Ireland, Poland, and Bangladesh. This Watch List is based on ISciences Water Security Indicator Model (WSIM) run on 10 January 2018.
The near-term forecast indicates exceptional deficits in the Lower Mississippi Valley and deficits nearly as intense through the South Atlantic States. Widespread moderate deficits are forecast from southern California through eastern Texas, with severe deficits near Houston. Moderate surpluses are forecast in the Great Lakes, and intense surpluses are forecast for eastern Nebraska, central Minnesota, and southeastern Idaho. After February deficits in the Lower Mississippi Valley and the South Atlantic State will moderate, deficits will spread in California, and widespread surpluses will emerge in the Northwest and along the Columbia, Missouri, and Yellowstone Rivers.
The near-term forecast through September shows a distribution pattern of water anomalies similar to the prior three months with some decrease in intensity. However, surpluses are forecast to increase in the central Gulf Coast. Beyond September water anomalies will continue to become less severe, though pockets of exceptional surplus will persist in Idaho and its neighbors. The forecast through March 2018 indicates the emergence of primarily moderate surpluses in many parts of the country.
Exceptional water surplus conditions spanning the Pacific northwestern states of Washington, Oregon and Idaho are expected to moderate in the near-term. Moderate surpluses are expected to develop along the central Gulf Coast and extend up the Mississippi Basin through the forecast period, settling over the northern Great Plains states by early 2018. Severe to exceptional deficits are forecast to develop over most of Alaska and moderate but persist throughout the forecast period.
Severe to exceptional water deficits will continue to emerge in the South and South Atlantic states through September, with moderate deficits in the Northeast and in the Ohio River Valley, though deficits are expected to diminish somewhat in severity after June. Moderate deficits may emerge on the Arkansas and Colorado Rivers and moderate to severe deficits in northern Colorado from June through September. Exceptional surpluses are forecast to persist in Idaho through June, along with surpluses of varying intensity in the Pacific Northwest and California. After June the extent and severity of these surpluses is forecast to diminish.
Regions likely to have significant water deficits for the 12-month period from December 2016 through November 2017 include: Arkansas, Quebec, Brazil, Finland, Denmark, Libya, Niger, Gabon, Madagascar, Saudi Arabia, Yemen, northern Russia, Inner Mongolia, Thailand, western Cambodia, Papua New Guinea, and eastern Australia. Water surpluses are forecast for: Idaho, Central California, southwestern Zambia, the Okavango Delta in Botswana, northeastern Afghanistan, and between the Irtysh and Yenisei Rivers in Russia. This Watch List is based on ISciences Water Security Indicator Model (WSIM) Global Water Monitor and Forecast issued 8 March 2017.