*Special Topics, Impact Highlights
ISciences staff
Impact Highlights: April 2025

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.

Impact Highlights: April 2025
East Asia
ISciences staff
East Asia: Deficits continue in NW China, ...

Exceptional deficits will remain in northwestern China, while regions of the Yangtze River Basin will observe an expansion of exceptional deficits across the region. 

East Asia: Deficits continue in NW China, Yangtze River Basin
South Asia
ISciences staff
South Asia: Deficits spread in Afghanistan, ...

Extreme to exceptional surpluses in India will resolve, leaving moderate surpluses in central and eastern portions of the country. Deficits are expected to spread in portions of Afghanistan, Pakistan, and northern India. 

South Asia: Deficits spread in Afghanistan, Pakistan, N India
Southeast Asia & Pacific
ISciences staff
Southeast Asia and the Pacific: Deficits ...

Extreme to exceptional surpluses in Maritime Southeast Asia will diminish, though some regions will observe continuing severe to extreme surpluses. Isolated regions in Mainland Southeast Asia will observe exceptional deficits. 

Southeast Asia and the Pacific: Deficits persist in Laos, Vietnam
Central Asia & Russia
ISciences staff
Central Asia & Russia: Deficits persist in ...

Widespread surpluses in southwestern Russia will mostly diminish. Exceptional deficits are expected in portions of the Urals, European Russia, northern coastal Russia, and in regions east of Lake Baikal. 

Central Asia & Russia: Deficits persist in European Russia, Urals, Buryatia

Mexico & C. Amer. & Carib

Mexico, Central America, & the Caribbean: central, S Mexico to observe continued exceptional deficits

Mexico, Central America, & the Caribbean: central, S Mexico to observe continued exceptional deficits

Exceptional deficits in northwestern and eastern coastal Mexico will dissipate, but remain in portions of central and southern Mexico. Widespread transitional conditions will resolve in central to southern Mexico and Central America, though some surpluses will continue in Central America. 

Many analyses reported in ISciences-authored blog posts are based on data generated by the ISciences Water Security Indicator Model (WSIM). Other sources, if used, are referenced in footnotes accompanying individual posts. WSIM is a validated capability that produces monthly reports on current and forecast global freshwater surpluses and deficits with lead times of 1-9 months at 0.25°x0.25° resolution. This capability has been in continuous operation since April 2011 and has proven to provide reliable forecasts of emerging water security concerns in that time-frame. WSIM has the ability to assess the impacts of water anomalies on people, agriculture, and electricity generation. Detailed data, customized visualizations, and reports are available for purchase.

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