Traders see the narrow spread between 98–99°F (37.5% implied probability) and 100–101°F (31.0%) as evidence of modest forecast uncertainty for Dallas’s August 27 high. National Weather Service and NOAA model runs show a weak upper-level ridge and light southerly flow that should limit extreme heating, yet small differences in boundary-layer moisture and afternoon mixing could push the daily maximum across the 100°F threshold. Late-August climatology for the region centers near 96–98°F, providing a baseline that current guidance slightly exceeds. The next model cycle and updated temperature observations will be the key catalysts that resolve the 45–55% range between these two bins.