MAPS ALERT: The WestWide Drought Tracker is getting a major upgrade!
New and improved maps are located here. We strongly encourage using the new maps application.
Continue to use the menu options above for time series and archive features until they are upgraded at a later date.

Current Product:
PRISM > SPEI 4 Month > Western US

Download PRISM SPEI 4 Month NETCDF Data for United States

Download PRISM SPEI 4 Month GeoTIFF Data for United States