How dry is Arizona?

From the climate.gov article Western Drought 2021 Spotlight: Arizona by Tom Di Liberto (7/29/2021): Looking back even farther by using a drought indicator known as the Standardized Precipitation Index, the current drought in Arizona is also the worst on record back to the late 1800s. Going back even farther than …

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How Low is Lake Mead?

The Bureau of Reclamation posts the end of month elevation for Lake Mead dating back to 1935. I created the graph of minimum yearly end of month elevation starting in 1940 since Hoover Dam was only created in 1935. Here is the R code to create the graph including importing …

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How much of the U.S. is in drought?

The United States Drought Monitor is your source for drought information. Starting with the main graph, copied here, you can select regions and then down to state levels. From the data tab you can select time series graphs, download tabular data by selected region, as well as obtain GIS files. …

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