Recently observed water conditions across the whole of South America are expected to persist through the near-term forecast period with widespread exceptional water deficits spanning the whole of northern Brazil and the Amazon basin. Exceptional surpluses in central Argentina and southern Paraguay persist in the near-term before moderating in the later forecast periods. In the September through November period, severe to exceptional deficits are expected to persist in northern Chile and across the northern states of Brazil including Roraima, Pará, and Amapá.
Regions forecast to have significant water deficits for the 12-month period from March 2017 through February 2018 include: Quebec (CA), Brazil, northern Chile, French Guiana, Suriname, Finland, Estonia, Latvia, northern Africa, Gabon, South Africa, Namibia, Saudi Arabia, Qatar, Yemen, Papua New Guinea, Western Australia and Tasmania (Aust.). Water surpluses are forecast for: Idaho (US), La Pampa (Argentina), western European Russia, eastern Romania, southeastern Tanzania, the Volga River Basin, between the Ob and the Tom Rivers (Russia), Kazakhstan, and Bangladesh. This Watch List is based on ISciences Water Security Indicator Model (WSIM) Global Water Monitor and Forecast issued 9 June 2017.
The forecast for June 2017 indicates much warmer than normal temperatures across northern South America, the Sahel, coastal West Africa, the Arabian Peninsula, Indonesia, and other regions. Precipitation anomalies include much wetter than normal conditions in Gabon, northern Zambia, and Tanzania; and much drier than normal conditions in Ethiopia and Western Australia.
The forecast for the next three months shows a significant reduction in the extent and severity of water deficits in the Ohio River Valley, Lower Mississippi Valley, the Deep South, and South Atlantic states. Parts of New England will transition from deficit to moderate surplus. Surpluses are forecast in the northern half of Michigan’s Lower Peninsula, Wisconsin, and Iowa, southern Missouri, southern Kansas, northeastern Oklahoma, and southern Colorado. Extreme to exceptional surpluses are forecast in Idaho and surrounding states, and surpluses of generally lesser severity are expected in California’s northern two-thirds.
Water deficits of varying severity are expected through October in central and northern Quebec, Ontario, northeastern Manitoba, and northern British Columbia and Alberta. These deficits may be exceptional through July in Ontario along the border with Quebec and northeastern Manitoba, and through October across central Quebec. Moderate surpluses are forecast through October in southern Quebec. Surpluses reaching exceptional intensity are forecast through July in northeastern British Columbia; and through October from northwestern Saskatchewan into Ft. McMurray, Alberta, and northwest of Lake Winnipeg in Manitoba.
Though water deficits are forecast for Mexico over the next six months, they are expected to be primarily moderate, a significant improvement over the prior three months. Through July deficits are forecast in northwestern Mexico; scattered down the Pacific coast and central Mexico; in Yucatan, Tabasco, and Chiapas; and southern Guatemala. After July deficits will continue to emerge in Baja California, Mexico’s southern states, and northern Central America. Some modest surpluses are forecast to emerge in the north along the border of Sonora and Chihuahua.
A return to near-normal water conditions is forecast for Southeast China from May through July, a change from surpluses observed in prior months. Deficits of varying severity are forecast for Mongolia; western Inner Mongolia, Guangdong, and Yunnan, China; and northern Japan. Surpluses are forecast in Qinghai and in a wide north/south swatch of central Tibet. The forecast for August through October shows a significant retreat of water anomalies in China’s eastern half, with some moderate deficits in Guizhou, Sichuan, and coastal Guangdong.
Severe to exceptional water deficits are forecast throughout Saudi Arabia from May through July, increasing in extent from the prior three months, and in southern Iraq and west of the Euphrates. Deficits nearly as intense will emerge in United Arab Emirates, Qatar, and Lebanon. Deficits of varying severity are forecast for Turkey, Lebanon, West Bank, Israel, Jordan, Yemen, Oman, and eastern Iran. Surpluses may persist in northeastern Iraq into northwestern Iran. The forecast for August through October shows a distribution pattern similar to May through July.
From May through July moderate to severe water deficits are forecast to emerge in eastern Myanmar and western Thailand. Exceptional deficits in Papua New Guinea will downgrade but severe to extreme deficits will persist and emerge farther west into Papua, Indonesia. Moderate deficits are forecast to emerge in the western two-thirds of Indonesian Borneo. Surpluses reaching exceptional severity will persist in Sumbawa and Flores Islands, Indonesia, and moderate surpluses are forecast for northeastern Borneo and southern Philippines. After July deficits in the region will downgrade and surpluses will nearly disappear.
Widespread exceptional water deficits in northern Russia observed in the prior three months are forecast to retreat May through July. However, drier than normal conditions will persist from the Yamal Peninsula to the Sea of Okhotsk. Exceptional surpluses are forecast in the Volga River Basin, the Irtysh, and between the Ob and the Tom Rivers. Surpluses will continue to emerge in many parts of Kazakhstan and are also forecast for eastern Uzbekistan, Kyrgyzstan, and Tajikistan. Moderate deficits are forecast for Turkmenistan and central Uzbekistan. Beyond July the forecast shows a similar geographic distribution of anomalies but with some changes in conditions.