Monitoring Drought

The Standardized Precipitation Index

1999 SPI Maps through May

click on images for full-size maps
1-month SPI through May 1999 3-month SPI through May 1999
Interpretation of 1-month SPI
Interpretation of 3-month SPI
6-month SPI through May 9-month SPI through May
Interpretation of 6-month SPI
Interpretation of 9-month SPI
12-month SPI through May 1999 Year-to-date SPI through May
Interpretation of 12-month SPI
Year-to-date SPI

 

 

 

© 2005 National Drought Mitigation Center

 
Quick Link to Other Drought-related Sites Quick Link for Media Drought for Kids Publications Drought Photo Gallery Drought Network News Search the Site Site Map What's New Quick Link to NDMC's Drought Impact Reporter Link to US Drought Monitor Back to the NDMC Home Page Contact Information About the NDMC Mitigating Drought Understanding Your Risk Planning for Drought What is Drought?