Exceptional surpluses will persist in northern regions of Mainland Southeast Asia. Most areas of Maritime Southeast Asia will observe near-normal conditions.
Severe to exceptional surpluses are expected to persist in several regions of India and emerge in Bangladesh. Some South Asian countries will observe isolated pockets of deficit.
Exceptional deficit anomalies will continue in southern regions of the Middle East, as well as in coastal regions of Turkey. Isolated pockets of exceptional deficit will also persist in Iran. Southwestern coastal areas of the Middle East will continue to observe moderate to severe surplus.
Exceptional deficits will remain in areas near Lake Baikal and in much of western Russia. Northern and southeastern Kazakhstan will observe continuing surpluses of varying intensity, as will some Russian areas near the Lena River.
The forecast indicates a transition away from widespread water surpluses and towards the gradual emergence of deficits. Exceptional deficits in western Cambodia are expected to persist through February or longer, but should diminish in extent after November. From September through November moderate deficits will begin to emerge in Thailand, the Malay Peninsula, southern Sumatra, and Java, and thereafter in Borneo and Sulawesi.
Though a significant retreat of exceptional water surplus in the region is forecast through October, exceptional surpluses remain in the forecast for: western Myanmar; eastern Thailand into southern Laos; and, southeastern Sulawesi and Sumbawa and Flores Islands in Indonesia. Exceptional deficits are forecast for a large block of western Cambodia, and deficits of varying severity are forecast for the Mekong Delta, southern Thailand, Singapore, Malaysian Borneo, southern Sumatra, and pockets in central Papua New Guinea. After October, near-normal conditions are expected in many parts of the region and deficits in western Cambodia will moderate.
The July through September forecast shows the near absence of widespread surpluses observed in prior months. However, exceptional surpluses are forecast for western Myanmar; northern Prachuap Khiri Khan Province, Thailand; the extreme southeastern region of Sulawesi; and Flores Island in Indonesia. Severe to exceptional deficits are indicated in much of Cambodia, in Vietnam’s Mekong Delta, and in central Papua New Guinea. In the October-December timeframe moderate deficits are indicated in many parts of the region, and thereafter deficits in Southeast Asia may intensity.
Much of the region has experienced exceptional water surplus conditions in the most recent observations. These moderate in the near-term forecast and subside completely September through February 2018. Recently observed exceptional deficits in Cambodia and Papua New Guinea subside during the June through August period. In the December through February 2018 forecast period deficits may emerge over mainland Malaysia and coastal Myanmar.
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.
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