Drought Risk Atlas

Atlas Methodology

Background

The Drought Risk Atlas wanted to take concepts and ideas that were put into the original Drought Atlas in the early 1990’s by Hoskings, Wallis and Guttman and take them in a new direction.  The original Drought Atlas had roughly 1,000 stations and the period of record for most was from the 1940s on.  The data analyzed for this project consisted of the Historical Climate Network (HCN) data, and estimates were used in places.  A monthly time step was used to calculate the Palmer Drought Severity Index (PDSI). 

In the concept for the new Drought Risk Atlas, we wanted to scan the digitized data for the most complete, long term weather stations in the country.  We also wanted to capitalize on calculating several drought indices using a weekly time step, for multiple periods.

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