The near-term forecast through January indicates several striking changes from the prior three months: a transition in the Gulf Coast from water surplus to deficit, a broad path of deficits in the South Atlantic States, and surpluses from the Upper Midwest through the Ohio River Valley into the Northeast. In the spring normal water conditions should return to the Ohio River Valley and the Northeast, surpluses will continue to emerge in the Upper Mississippi, and deficits will moderate in the Lower Mississippi, Texas, and the South Atlantic States.
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Regions forecast to have significant water deficits for the 12-month period from August 2017 through July 2018 include: Amapá, Amazonas, and Maranhão (Brazil); Madhya Pradesh and Haryana (India); Cambodia; Fujian and Inner Mongolia (China); Mongolia; Papua New Guinea; and, South Australia and Tasmania (Australia). Areas with a forecast of significant water surpluses include: Bangladesh; Tripura, Mizoram, and Manipur (India), western Myanmar; the Yangtze River (China); Poland; and European Russia. This Watch List is based on ISciences Water Security Indicator Model (WSIM) issued 8 November 2017.
The outlook for the United States indicates widespread exceptional water deficits throughout the Northeast from July through September. Deficits of varying severity are also forecast for parts of the Midwest and Upper Midwest, the Pacific Northwest, and California. Widespread water surpluses are expected in eastern Texas and surpluses are also forecast in West Virginia and Nebraska. After September deficits will diminish with the exception of the Missouri and Yellowstone Rivers. Surpluses in Texas will diminish. Widespread surpluses are forecast to emerge in Wisconsin and across the Mississippi River into Minnesota.
The outlook for the United States indicates widespread and varied water anomalies for much of the country. Water deficits are forecast for much of the Northeast, parts of the Southeast, Upper Midwest, and West, which are expected to be most severe June through August, particularly in the Northeast and West. Water surpluses are forecast for a vast portion of Texas which are also expected to be of greatest extent and exceptional severity through August.
The overall outlook for much of the United States indicates only moderate water anomalies for much of the country. However the forecast for May through July includes the emergence of some severe deficits in the Northeast, along the East Coast, and in the Upper Midwest which will persist through October. Exceptional water deficits will also persist in much of southern California and southwestern Arizona. Severe to exceptional surpluses are forecast in northeastern Nevada and across the border into Idaho, eastern Texas, parts of Nebraska, scattered pockets in the Northwest, south-central Alaska, and the western half of the island of Hawaii.
United States: Water deficits forecast across the North, Mississippi Valley; surpluses in Texas, South Carolina
The 12-month forecast through August 2016 indicates water deficits across the northern US from eastern Oregon to Maine, with greatest severity in the Great Lakes Region. Widespread and severe deficits are also forecast in the Mississippi Valley from Minnesota to the Gulf of Mexico. Surpluses are forecast in California, the Southern Plains, and in the Southeast. Both deficits and surpluses are expected in Virginia, North Carolina, South Carolina, and East Texas.