The Evaporative Stress Index (ESI) is a global dataset produced weekly at 5-kilometer resolution for the entire globe, which can help reveal regions of drought where vegetation is stressed due to lack of water. Based on variations in land surface temperature, the ESI indicates how the current rate of ET compares to normal conditions. Negative ESI values show below normal ET rates, indicating vegetation that stressed due to inadequate soil moisture. The ESI can be used as a tool to visualize dry areas at risk to wildfires and as a dataset variable in predictive fire path modeling.   


NASA – Evaporative Stress Index

Data Sources

Access & Use Information

Public: This dataset is intended for public access and use.

Downloads & Resources

ESI Map Service


FEMA Mapping and Analysis Center (MAC)



Updated on October 10, 2019