The IRI has worked in collaboration with the NOAA Climate Prediction Center (CPC) and the University of Maine to develop a tool that provides probabilistic forecasts of future Standardized Precipitation Index (SPI) as an indicator of drought for various accumulation periods for the globe.

The IRI has worked in collaboration with the NOAA Earth System Research Laboratory (ESRL) and Climate Prediction Center (CPC) to develop a set of tools that provide probabilistic forecasts of future Standardized Precipitation Index (SPI) as an indicator of drought for various accumulation periods over the U.S. and Mexico based upon two forecast methodologies.