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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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.
Water deficits in the Southwest and Southern California will moderate overall in the near-term. Intense deficits will spread in Missouri, persist in northern Louisiana and central Mississippi into central Alabama, and emerge in North Carolina, Virginia, Maryland, and Delaware. Surpluses are forecast for Idaho, western Montana, southern Wyoming, central Nebraska, Minnesota into Wisconsin, and Michigan. After March, primarily moderate deficits will continue to emerge from California to North Carolina, and surpluses are forecast for Idaho, western Montana, northwestern Wyoming, and along the Columbia, Missouri, and Yellowstone Rivers.
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.
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.
Water deficits are forecast for Missouri, Oklahoma, and Arkansas, as well as in a line extending northeast from Mississippi through Alabama, northern Georgia, western South Carolina, western North Carolina, Virginia, Maryland, and Pennsylvania. Surpluses are expected in southern Idaho, northeastern Nevada, and northwestern Utah.
In the US, water deficits are forecast to persist through February from Pennsylvania and Ohio southward to the Gulf but will diminish in severity thereafter. Much of the far Northeast, with the exception of Vermont, is expected to return to near-normal conditions December through February. Surpluses will continue to emerge in Wisconsin, southern Minnesota, and northern Iowa through February, and Idaho, western Montana, and Washington through May. Moderate deficits will emerge March through May in Maine, southern New Hampshire, Massachusetts, Rhode Island, and Connecticut, and from North Carolina through Florida.