The dominant market positioning on a 56-57°F low for Seattle on September 7 stems from the official National Weather Service observation of a 57°F minimum at Seattle-Tacoma International Airport, recorded shortly after midnight amid clear skies and light winds. This value aligns with recent cool nighttime conditions across the Pacific Northwest, where regional high pressure suppressed cloud cover and allowed efficient radiational cooling, yielding readings 2°F above the 1991-2020 normal low of 55°F. Model consensus from prior days had converged on similar outcomes, with limited variability in steering patterns or marine layer influence. While a revised station reading or post-analysis adjustment remains theoretically possible, such shifts are rare given standardized instrumentation and quality controls at the primary reporting site.