Though exceptional water surpluses will diminish through March, widespread and intense conditions will persist from Wisconsin through southern Minnesota, Iowa, eastern Nebraska, eastern Kansas, central Oklahoma, and central and eastern Texas. Surpluses along the Eastern Seaboard will also persist but moderate, while conditions in the Ohio River Valley normalize. In the western US, mild deficits are forecast punctuated by pockets of more intense anomalies, deficits as well as surpluses.
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The August Outlook indicates much warmer than normal temperatures in much of Europe reaching exceptional intensity in parts of Central Europe and southern Scandinavia. Precipitation is expected to be above average in Greece, Italy, and across the Mediterranean into Algeria.
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.
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 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.
After July the Northern Plains States should see a significant retreat of exceptional water deficits. Surpluses will persist in the Gulf region, diminish in the Great Lakes States, and transition to mild deficits in Virginia and North Carolina. After October moderate water surpluses will re-emerge in most of the Great Lakes States and in the Ohio River Valley, and pockets of surplus will continue to emerge in Idaho and surrounding states. Deficits in the southern states of the East Coast are expected to ratchet up slightly to moderate intensity and emerge in Florida.
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.
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.
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.