Recent flash drought expansion across the South-Central U.S., driven by 10–15°F above-normal temperatures and persistently dry conditions from Texas through the lower Mississippi Valley, forms the main catalyst for trader sentiment. U.S. Drought Monitor assessments show widespread degradations into D3–D4 categories in Oklahoma, Texas, and adjacent states, with additional worsening along the North Dakota–Minnesota border and Northeast. This supports the 62% implied probability on 10 or more states in D4 for the week of September 15, while cooler, wetter pockets in Colorado and Wyoming limit further spread. NOAA forecasts of above-normal precipitation for mid-September introduce uncertainty for exact D4 thresholds, as model consensus remains sensitive to short-term rainfall timing and intensity.