**Flash drought driven by persistent hot, dry weather has expanded severe (D2) to extreme (D3) conditions across the South-Central U.S., while longer-term precipitation deficits sustain limited exceptional (D4) areas.** The U.S. Drought Monitor for the week ending September 1, 2026, shows 49.51% of the U.S. and Puerto Rico in drought (D1–D4), with D4 covering about 1.4% of the area amid degradations in the Southern Plains, Lower Mississippi Valley, North Dakota–South Dakota–Minnesota border, and Northeast; scattered improvements occurred in Colorado and Wyoming. Authoritative inputs include soil moisture percentiles, streamflow, Standardized Precipitation Index values, and vegetation health from NOAA, USDA, and NASA. The next USDM update, based on data through early the following week, will incorporate any late-August or early-September rainfall that could alter D4 boundaries before resolution.