Abstract

The current drought in Texas has become the second worst in the last 120 years, exceeded only by the 1950s drought of record. It is easy to compare the two in terms of area, length, and severity using the Palmer Drought Severity Index (PDSI), and the underlying atmospheric process can be reconstructed with data from the National Oceanic and Atmospheric Administration (NOAA) reanalysis model. Reanalysis is a comprehensive, global data set produced by the National Centers for Environmental Prediction. The historical surface observations, balloon soundings, and satellite data have been reprocessed or reanalyzed with a sophisticated computer model. Thus, it is possible to compare the 1950s drought and the current drought directly using data from the same model. The meteorological processes operating in these droughts showed similar patterns of 500 mb pressure, outgoing longwave radiation, and geopotential height.

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