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Looking to Download Data? The Drought.gov team reformats data from multiple partners into web- and GIS-ready formats, which we use throughout Drought.gov. These data are free for all to download.
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This is a developmental/forked version of code that was originally developed by NIDIS/NCEI. This project contains Python implementations of various climate index algorithms which provide a geographical and temporal picture of the severity of precipitation and temperature anomalies useful for climate monitoring and research. The most updated version is currently being maintained and developed by independent scientific programmer James Adams on his Github account, which includes feedback and contributions from active users worldwide.

NOAA's National Centers for Environmental Information (NCEI) developed Fortran code to calculate Standardized Precipitation Index (SPI) and the Palmer Drought Severity Index (PDSI).  This code is not an exact copy of what is run on NCEI's internal servers, but represents general use version approved for public release. 

A one-stop shop tool that places recent temperature and precipitation conditions in both a historical and geographical perspective across the Southeast.

The Southern Regional Climate Center Dashboard provides climate data products for the Southern U.S., including Arkansas, Louisiana, Mississippi, Oklahoma, Tennessee, and Texas.