The forecast indicates a transition away from widespread, intense water surplus to deficit. Deficits are forecast for peninsular Malaysia, Borneo, Sulawesi, New Guinea, Java, pockets in Sumatra, and eastern Mindanao. Deficits will diminish somewhat in northwestern Cambodia, increase in southeastern Thailand, and emerge in Vietnam east of Hanoi and in central Myanmar. Surpluses are forecast for western and southern Myanmar, northern Laos, northwestern Vietnam, eastern Cambodia into Vietnam, central Philippines, and East Nusa Tenggara.
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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.
Exceptional water deficits are forecast to persist in Cambodia through May. From September through November deficits will continue to emerge in Thailand and the eastern half of Luzon, Philippines. Surpluses are forecast in Laos, western Flores Island, Vietnam, Sumatra, Java, North Kalimantan, West Papua, and northern Luzon. By December, however, much of the region will begin to transition to water deficits of varying severity which will persist through May.
Thailand, Laos, Cambodia, and the Malay Peninsula are forecast to continue in conditions of water deficit, which will be especially severe in Cambodia. Surpluses in western Borneo will diminish by September while surpluses on Java, and Flores Island may persist longer. From November on, deficits will increase in extent and severity on the Malay Peninsula and Sumatra, and will emerge in northeastern Borneo.