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Standardized Precipitation Maps
Introduction
The Standardized Precipitation Index (SPI) was developed for the purpose of defining and monitoring drought. Among others, the Colorado Climate Center, the Western Regional Climate Center, and the National Drought Mitigation Center use the SPI to monitor current states of drought in the United States. For more information on the methodology behind SPI, click on either a PostScript version or an Adobe PDF version of Chapter 3 of Dan Edwards' Masters Thesis. This document details the mathematics used in SPI calculation. For source code for a simple SPI program: |
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Latest Conditions
Projected Conditions at 0.2 Probability Level
- 3 month SPI projected 1 month
- 6 month SPI projected 2 months
- 12 month SPI projected 4 months
- 12 month SPI projected 6 months
- 24 month SPI projected 6 months
- 24 month SPI projected 12 months
- 48 month SPI projected 6 months
- 48 month SPI projected 12 months
Projected Conditions at 0.5 Probability Level
- 3 month SPI projected 1 month
- 6 month SPI projected 2 months
- 12 month SPI projected 4 months
- 12 month SPI projected 6 months
- 24 month SPI projected 6 months
- 24 month SPI projected 12 months
- 48 month SPI projected 6 months
- 48 month SPI projected 12 months
Projected Conditions at 0.8 Probability Level
- 3 month SPI projected 1 month
- 6 month SPI projected 2 months
- 12 month SPI projected 4 months
- 12 month SPI projected 6 months
- 24 month SPI projected 6 months
- 24 month SPI projected 12 months
- 48 month SPI projected 6 months
- 48 month SPI projected 12 months
Data Access
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