University of California, Merced and the Desert Research Institute
These experimental drought blends integrate several key drought monitoring products and indices into a single short-term or long-term product, based on the methodology developed at the NOAA Climate Prediction Center (CPC). These Drought.gov blends are created using the Climate Engine tool, and apply the CPC weighting ratios to the high-resolution gridMET gridded dataset. The data is updated daily, with a delay of 2 to 3 days to allow for data collection and quality control.
The short-term blend combines PDSI, Z-Index, 1-month SPI, and 3-month SPI to estimate the overall short-term drought.
The long-term blend combines PDSI, Z-Index, and 6-month, 1-year, 2-year, and 5-year SPI to estimate the overall long-term drought.