This week’s drought summary
Much of the lower 48 states experienced near to below normal temperatures this week, with the exception of parts of the northern Great Plains, Upper Midwest, southern Texas, and parts of the Lower Mississippi Valley. Large portions of southern Texas experienced excessive heat this week, with daytime high temperatures averaging well above 100°F for several locations. A mean frontal boundary draped across much of the lower 48 states resulted in periods of heavy rainfall across portions of the western Great Plains and Intermountain West, leading to improvements to drought conditions across much of the western half of the lower 48 states. The only exception was in the northern Cascades in Washington, where below-normal precipitation led to worsening drought conditions. Heavy rain also fell across parts of the Southeast, with many locations across the Deep South receiving in excess of 5 inches of rainfall, leading to improvements to abnormally dry and moderate drought conditions from central Mississippi southeastward to Florida. Toward the end of the weekend, a slow-moving storm system traversing eastward across the Middle Mississippi and Ohio Valleys resulted in additional periods of heavy rainfall across portions of the eastern U.S. However, much of the Mississippi and Ohio Valleys and the Northeast experienced a mix of worsening and improving drought conditions based on antecedent dryness and where the heaviest rain fell, respectively. Another round of deterioration was warranted again this week across much of the Midwest and eastern Great Plains, where below average precipitation continued to add to precipitation deficits that go back several months.
South
Several rounds of heavy rainfall associated with clusters of thunderstorms traversed portions of the Southern region from Oklahoma to Mississippi, leading to targeted improvements to abnormal dryness (D0) and drought conditions. Additional improvements to the drought depiction are also warranted across portions of the Texas Panhandle, where drought indicators have continued to improve due to well above average (in some cases record) rainfall over the past 60 days. Conversely, targeted degradations are warranted across parts of the Lower Mississippi and Tennessee Valleys, where short-term dryness continues to increase. Excessive heat, especially during the latter portions of the week, helped to exacerbate dryness across portions of southern Louisiana and coastal areas of eastern Texas, where 30-day rainfall deficits continue to increase.