**Persistent high pressure and a strong heat dome over the central U.S. are sustaining extreme heat across North Texas, positioning mid-100s readings as the most likely outcome for Dallas’s August 21 high.** Recent observations show Dallas-Fort Worth reaching 106°F on August 17—the year’s hottest reading so far—marking the seventh straight day above 100°F. National Weather Service forecasts and model consensus point to continued sunny, hot conditions with highs near 103–106°F on the 21st, supported by subsidence under the ridge that promotes clear skies and efficient daytime heating. Low-level moisture remains limited enough to allow strong solar insolation while steering patterns keep any sea-breeze or frontal influences at bay. Climatologically, late-August Dallas highs average near 95°F, so the current anomaly of roughly +8–11°F aligns with the market’s heavy weighting toward 104–105°F (52%) and 106–107°F (25%). Higher bins receive lower implied probability because ensemble guidance shows only modest day-to-day variability and limited risk of extreme outliers or significant afternoon convection that would cap the maximum. Updated short-range model runs and the next NWS forecast discussion remain the key near-term catalysts that could shift these probabilities.