National Weather Service guidance and consensus model runs indicate a peak temperature near 105–106°F for Dallas on August 21 under a strong high-pressure ridge delivering mostly sunny skies, light southerly winds, and strong subsidence warming. These conditions favor maximum solar heating with minimal cloud cover or mixing, consistent with the ongoing late-summer heatwave that has produced consecutive 100-plus-F days and extreme heat warnings. The resulting distribution centers on the 104–105°F bin at 51.5% implied probability, followed by adjacent ranges that capture typical forecast spread and measurement uncertainty at official stations. Traders are weighting recent model updates and climatological analogs for the region, where such ridge-driven events commonly deliver highs in this narrow window rather than extremes.