Drought Early Warning Systems
Definition
Drought Early Warning Systems (DEWS) are GIS-enabled tools that detect and predict the onset, severity, and duration of drought conditions. They integrate meteorological, hydrological, and satellite-derived data to assess anomalies in precipitation, temperature, soil moisture, and vegetation health.
Application
DEWS support national governments and farmers in proactive drought mitigation. GIS visualizations include SPI (Standardized Precipitation Index) maps, NDVI vegetation stress maps, and soil moisture anomalies. Web dashboards offer real-time alerts, risk forecasts, and decision support for water allocation. Systems like FEWS NET and the UN’s Global Drought Early Warning System inform humanitarian response planning.
FAQ
What indicators are used in DEWS?
Precipitation trends, soil moisture, vegetation indices, temperature, and water reservoir levels.
Why is GIS important in drought early warning?
It allows spatial analysis of risks, visual communication, and region-specific response strategies.
Who benefits from DEWS?
Farmers, water managers, disaster agencies, and international aid organizations.
What are key DEWS platforms?
FEWS NET, GLDAS, UNCCD Drought Toolbox, and regional drought monitors like US Drought Monitor.
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