October 29, 2009
Graph of the Day: 24-month Precipitation Surplus/Deficit for Texas
The image, from the state climatologist’s report, shows 24-month precipitation surplus/deficit expressed as standard deviations at the peak of the drought. Darkest red shows 3 standard deviations, and corresponds to the areas of record-setting drought. At that moment, (late August) San Antonio had received less than two feet of rain over the preceding two years. In addition to the rainfall deficit, this drought was exacerbated by unusual heat. …
