The forecast for May 2025 expects significant water deficits for the 12-month period of February 2025 through January 2026 in northwestern and central Africa, the Middle East, Europe, Brazil, and northwestern to southeastern China. Areas expected to experience surplus include central and southern Africa, northeastern Australia, and portions of the Amazon rainforest.
In this installment of the Proof Point series, we detail current weather-related events affecting the Amazon rainforest and the historical accuracy of the Water Security Indicator Model (WSIM) forecasts.
Each month, ISciences reports on significant weather events occurring throughout the world and analyze how accurately our Water Security Indicator Model (WSIM) predicted them. In this series, we highlight the most severe global weather events which occurred during the month of April, and discuss the extent of their impact on the affected regions.
Exceptional deficits will remain in northwestern China, while regions of the Yangtze River Basin will observe an expansion of exceptional deficits across the region.
The forecast through May indicates that the widespread, exceptional water deficits that have dominated Australia in prior months will diminish considerably. However, exceptional deficits are forecast in the far north and in northern South Australia. Severe deficits are forecast in eastern Queensland and extreme anomalies in the Northern Tableland of New South Wales. Intense deficits are also forecast for Tasmania, New Zealand, and New Caledonia.
The forecast through March indicates that the intense water deficits that have dominated many parts of Australia in prior months will diminish considerably. However, severe to exceptional deficits will persist in Tasmania; along the southeastern coast of Australia from Adelaide past Melbourne; in the Strzelecki Desert in northwestern New South Wales; around Darwin in Northern Territory; and in the Blackwood River region near Busselton in the tip of Western Australia.
The forecast through January indicates that intense water deficits will persist in southeastern Australia with exceptional deficits in western Tasmania. Deficits may be severe to extreme along the Murray River. Moderate deficits will cut a broad path from New South Wales into the center of the country surrounding the Simpson Desert. Some severe deficits are forecast in western North Island, New Zealand. Deficits in New Caledonia will moderate.
The forecast through December indicates that intense water deficits which have dominated much of Australia in prior months will retreat from most regions except the southeast. Deficits will be exceptional in Tasmania, and severe to exceptional along the southeast coast from Adelaide through Victoria and past Canberra. Moderate to severe deficits are forecast for New Zealand. Deficits in New Caledonia will moderate.
Moderate water deficits, punctuated by more intense pockets, are expected across much of Victoria and New South Wales (NSW) and across northwestern and northern Australia. Areas of intense deficit include: the southwestern tip of Western Australia; from Melbourne through Canberra past Sydney; and, near Darwin and the Daly River region of Northern Territory. Generally mild deficits are expected in New Zealand. Deficits in New Caledonia will be intense.
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