National Weather Service forecasts and ensemble model guidance indicate a persistent heat dome over the southern Plains will drive Dallas highs into the 104–107°F range on August 19, supporting the market’s leading 104–105°F (50.5%) and 106–107°F (25.5%) bins. Hot, dry southwesterly flow under strong high pressure favors rapid daytime heating with minimal cloud cover or precipitation, though slight model spread on dew points and boundary-layer mixing creates uncertainty around whether peak readings reach the upper or lower end of that interval. Recent NWS heat advisories and observed 100-plus readings in the preceding days reflect the same synoptic pattern, while climatological baselines for mid-August show such extremes occur roughly one in four years. Updated model runs and local observations on the 18th will refine the final peak before resolution.