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.
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Exceptional water surpluses are forecast in southeastern Texas through November along with surpluses of lesser severity along the Gulf. Exceptional deficits in the Northern Plains States will moderate. In the West, surpluses are forecast in Idaho, nearby areas of surrounding states, and pockets of central California. Deficits are expected in: northern Colorado, Kansas, Iowa, northeastern and southernmost Texas, southern Michigan, northwestern Pennsylvania, northern Maine, southern West Virginia, and the Southeast. After November moderate surpluses are forecast for the Ohio River Valley.
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.
Though the extent of exceptional deficits from Missouri to the Gulf and to the Atlantic is expected to recede from March through May, exceptional deficits will persist in Arkansas, Missouri, and western Illinois, and moderate deficits will emerge throughout much of the US east of the Mississippi. Surpluses are forecast for the Pacific Northwest, Idaho, northern Nevada, Central California, western Nevada, and western Colorado and are expected to be exceptional in Idaho, parts of Central California, and along the Columbia River.
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.
The outlook for the United States through January indicates that water deficits will dominate the Ohio River Valley west through Arkansas and south to the Gulf, as well as the Delaware and lower Susquehanna drainages. Surpluses of varying severity are forecast for a vast block of the Northwest, Minnesota, Wisconsin, Iowa, and eastern North Carolina. From February through April the severity of both deficits and surpluses will diminish and some states in the Midwest and Northeast will transition to near-normal conditions. However, surpluses will persist in much of the Northwest and Upper Midwest.
Regions likely to encounter significant water deficits in the coming months include: the US South, Oaxaca (Mexico), Chile, Scandinavia, southeastern Ethiopia and southern Somalia, Iran, the Indian states of Karnataka, Kerala, and Gujarat, and Cambodia. Water surpluses are forecast for: the US Northwest and Upper Midwest, eastern North Carolina, southern British Columbia (Canada), Nicaragua, eastern Romania, southern Belarus, northeastern Poland, Nepal, Bangladesh, western Myanmar, Java, Shanghai, Fujian, and the Warrego River Basin (Australia). This watch list is based on ISciences Water Security Indicator Model (WSIM) Global Water Monitor and Forecast issued 9 November 2016.
The outlook for the United States through December indicates that water deficits will continue to dominate much of the northeastern US, though the expanse of exceptional deficits is expected to shrink. Significant deficits will also persist from Ohio through the South, in Southern California, and along the Missouri and Yellowstone Rivers. A large block of surpluses will persist in Wisconsin, Minnesota and Iowa. After December deficits across the country will diminish considerably but surpluses in the upper Midwest are expected to persist and moderate surpluses will emerge in the Rocky Mountain States.
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.