Recent National Weather Service and model guidance point to a strong upper-level ridge driving anomalous warmth across the Pacific Northwest, positioning Seattle's June 15 daily high near 90°F at Sea-Tac. Ensemble forecasts from the ECMWF and others show 850 mb temperatures 14–16°C above normal, supporting surface maxima in the upper 80s to low 90s, with some runs reaching 92°F under clear skies and light northerly flow. This setup exceeds the 1963 record of 88°F and aligns with the market's heaviest trading on the 90–91°F bin. Key variables remain the ridge's exact position and any marine layer intrusion, which could cap readings closer to 88°F if timing shifts. Updated model runs and the afternoon forecast discussion will provide the next resolution signals before the 24-hour window closes.