National Weather Service and NOAA model consensus currently favors a high-pressure ridge over north Texas with southerly flow and mostly clear skies on May 18, positioning Dallas afternoon highs in the upper 80s to low 90s. This setup supports strong daytime heating with limited cloud cover or frontal interference, keeping the 88-89°F outcome as the slim market leader at 35.5% implied probability while the closely trailing 86-87°F and 90-91°F bins reflect ongoing uncertainty in exact peak mixing and boundary-layer moisture. Historical May climatology for the region shows average highs near 85°F, so any modest strengthening of the ridge or reduced wind could push readings into the 90s, whereas increased boundary-layer clouds would favor the mid-80s range. Updated short-range guidance expected later today will likely refine these thresholds ahead of market resolution.