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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:
Unix tar format
zip format

SPI Archive
2002
2003
 
 
 
 
 
 
 

Latest Conditions

Projected Conditions at 0.2 Probability Level

Projected Conditions at 0.5 Probability Level

Projected Conditions at 0.8 Probability Level

 


Data Access Links > Current Weather: ColoradoUSAWorld  | Water Year Data: Colorado  |  Long Term Climate: ColoradoUSAWorld  


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Colorado Climate Center Department of Atmos. Science Colorado State University
Fort Collins, Colorado 80523


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Site last updated: May 13th, 2003
Contact: Colorado Climate Center.