Flash drought driven by persistent above-normal temperatures and below-average precipitation has expanded rapidly across the South-Central United States through early September 2026, intensifying conditions in Texas, Oklahoma, Arkansas, and adjacent states while long-term deficits sustain D4 exceptional drought in parts of Colorado, Nebraska, and Wyoming. The U.S. Drought Monitor for the period ending September 1 showed D4 covering roughly 1.4% of the contiguous U.S., with ongoing degradation noted in the latest weekly assessments from the National Drought Mitigation Center and NOAA partners. Authoritative monitoring relies on integrated indicators including soil moisture, streamflow, and vegetation health compared against historical baselines, with the Saffir-Simpson or similar intensity scales not applicable here; instead, D4 denotes the most severe multi-month impacts. The Climate Prediction Center’s outlooks favor continued warmth and limited relief across much of the central and southern regions through mid-September, while the next USDM update and any heavier rainfall events could shift state-level D4 presence before resolution.