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 > SPI 48 Month > Western US

Download PRISM SPI 48 Month NETCDF Data for United States

Download PRISM SPI 48 Month GeoTIFF Data for United States