Cambodia continues to stand out through May in Southeast Asia with exceptional water deficit in the west. Surpluses are forecast for much of the rest of Southeast Asia, the Philippines, and Malaysia, and may be especially intense in western Myanmar, around the Gulf of Tonkin, central Philippines, and Brunei. Deficits will emerge in the southern tip of Sumatra and into Java, but are expected to nearly disappear in Papua New Guinea, persisting mainly around the Gulf of Papua. After May, surpluses in the region will retreat and Cambodia will return to near-normal conditions.
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Southeast Asia & Pacific
Exceptional water deficits will persist in western Cambodia through April. Deficits of varying severity are expected in Sumatra, Java, western Borneo, and Papua New Guinea. Intense surpluses are forecast for western and eastern Myanmar, northern Laos, along the Mekong River until it reaches Cambodia, and central Philippines. Surpluses are also forecast for Vietnam, pockets of Thailand, Brunei, and northeastern Borneo. After April, surpluses will retreat, Cambodia will transition to near-normal, and deficits are expected in Malaysia, Sumatra, and western Borneo.
Though water deficits persist in western Cambodia and Papua New Guinea, surpluses have dominated the rest of the region but will gradually transition to moderate deficit. Through March, exceptional surpluses are forecast in Myanmar, northern Laos, and northern Vietnam; less intense surpluses in southern Laos, eastern Cambodia, southern Vietnam, the Philippines, and Sumatra; and exceptional deficits in western Cambodia and northern Papua New Guinea. Mild deficits will emerge in Indonesia, and continue to emerge overall after March.
The forecast over the next six month indicates a gradual transition from predominantly surplus conditions to deficit, though western Cambodia and Papua New Guinea stand in contrast with current deficit conditions persisting throughout the period. In the near-term through February surpluses will diminish in Malaysia, Indonesia, Philippines, and Papua, but will persist in Myanmar, Laos, and Vietnam. After February deficits will emerge throughout Malaysia and Indonesia, diminish in western Cambodia, and moderate in Papua New Guinea.
The forecast indicates a gradual transition from predominantly surplus conditions to deficit, with Cambodia and eastern Papua New Guinea showing deficit conditions throughout. Through January surpluses will begin to retreat from Malaysia, Indonesia, the Philippines, and Papua but will persist with intensity in Southeast Asia. Moderate deficits will emerge in southern Thailand and around the Java Sea. After January severe deficits will begin to emerge in Malaysia and Indonesia and surpluses in Southeast Asia will begin to retreat.
The forecast indicates a gradual transition from predominantly surplus conditions to deficit. Western Cambodia and eastern Papua New Guinea, however, show deficit conditions throughout the 12-month forecast. Surpluses will begin to downgrade in the near-term but exceptional surpluses remain in the forecast through December for western Myanmar, northern and southern Laos, and along the west side of the Mekong River in Cambodia down to Phnom Penh. After December severe deficits will begin to emerge in Malaysia and Indonesia.
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.
Southeast Asia & the Pacific: Water deficits to emerge in northern Vietnam; surpluses persist in Phetchaburi, Thailand
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.