Current National Weather Service forecasts and ensemble model guidance for Dallas on August 30 point to overnight lows near 80–82°F under clear skies and persistent southerly flow, explaining the tight clustering of trader probabilities around those bins. High dew points near 65–70°F limit radiational cooling despite the lack of clouds, while warm-air advection from the Gulf keeps surface temperatures elevated relative to typical late-summer minima. Minor differences among guidance runs and local urban heat-island effects create the observed spread across 78–83°F outcomes, with lower-probability cooler bins reflecting historical variability and any potential for slightly stronger northerly drainage. Updated model runs and the official NWS forecast discussion tomorrow morning will provide the key data for resolution.