Through September, water surpluses along the Mississippi River, its tributaries, and states on the western bank of the river will moderate, but significant surpluses are forecast in a column from South Dakota through central and eastern Texas and will include extreme to exceptional anomalies in many areas, particularly South Dakota. Areas of deficit include the Pacific Northwest, northwestern Minnesota, the western Upper Peninsula of Michigan, and along the Atlantic coast in North Carolina.
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Regions forecast to have significant water deficits for the 12-month period from April 2019 through March 2020 include: Suriname, French Guiana, Finland, Estonia, Latvia, Egypt, Cameroon, and New Caledonia. Areas with a forecast of significant water surplus include: the central United States, Paraguay, Syria, northern Iraq, southern Turkmenistan, Afghanistan, Tanzania, and southeastern China. This Watch List is based on ISciences Water Security Indicator Model v2 (WSIMv2) run on 9 July 2019
The forecast through August 2019 indicates persistent water surpluses in a wide path through the center of the country in the Mississippi River Basin and well into the Missouri, Arkansas, and Red River Basins, including exceptional anomalies in South Dakota. Surpluses of varying intensity are expected in the Rockies, central Arizona, California, Oregon, and in the Northeast. Deficits are forecast for pockets of Washington, North Dakota, Wisconsin, and southeastern states.
Regions forecast to have significant water deficits for the 12-month period from March 2019 through February 2020 include: Suriname, French Guiana, Finland, Estonia, Latvia, Egypt, Somalia, Angola, and Namibia. Areas with a forecast of significant water surplus include: United States, Paraguay, Syria, northern Iraq, western Iran, Afghanistan, Tanzania, and southeastern China. This Watch List is based on ISciences Water Security Indicator Model v2 (WSIMv2) run on 10 June 2019
The forecast through July indicates widespread water surpluses of varying intensity a vast area on either side of the Mississippi River. Exceptional anomalies are forecast around Sioux Falls, and along the Mississippi River on either side of Memphis and from Louisiana to the Gulf. Surpluses will increase in the Rockies and shrink slightly and moderate in California. In the Pacific Northwest, deficits will shrink in Washington; Oregon will transition from deficit to moderate surplus.
Most notable in the forecast through May is the absence of widespread, intense water surpluses observed in the East in prior months and the emergence of surpluses in the West. Surpluses will shrink and downgrade in the center of the country but remain widespread in a broad path from southern Minnesota to the Gulf of Mexico and will be intense in Kansas. Moderate surpluses will cover much of California, and many Rocky Mountain States will transition from deficit to surplus.
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.
United States: Water deficits to emerge this spring in the Appalachians, the Ohio River Valley, & the Northern Plains
Overall, conditions in many parts of the US are forecast to be drier than normal. Moderate to exceptional water deficits are expected in the East through the Appalachians, the Midwest through the Ohio and Mississippi Valleys, across the Northern Plains and parts of the Central Plains, and in the Southwest. In the summer and early fall exceptional deficits are forecast on the Missouri and Yellowstone Rivers. Surpluses are forecast in Idaho and northeastern Nevada, the shared border of Minnesota and Iowa, the Canadian and Rio Grande Rivers, and southern Florida.
Water deficits may dominate the northern US from the Pacific Northwest eastward through Minnesota in the coming months, with surpluses in the Upper Mississippi. The forecast for California indicates a transition from deficits to surpluses by February. Surpluses may persist in the Central and Southern Plains and along Mississippi River tributaries. Extensive deficits are forecast March through May from the central Gulf Coast region northward through the Great Lakes region.