National Drought Mitigation Center
Reconstruction of Past Drought Across the U.S. Using Tree-Ring Data - Map Generator
Maps of Palmer Drought Severity Index (PDSI) based on tree-ring data and/or the instrumental record can be created for user-defined time periods.
National Oceanic and Atmospheric Administration
The National Drought Mitigation Center | 3310 Holdrege Street | P.O. Box 830988 | Lincoln, NE 68583–0988
phone: (402) 472–6707 | fax: (402) 472–2946 | Contact Us