Official precipitation measurements from National Weather Service climatological reports for September 13, 2026, form the primary driver of trader sentiment in this resolved market, with designated stations such as those in Seattle (0.55 inches, including rain and light rain) and Spokane (0.52 inches with heavy rain) confirming measurable totals while many others like New Orleans, Indianapolis, and Denver recorded zero. These data, released in daily summaries on September 14, align with regional patterns including Northeast totals often exceeding 0.5 inches in New Hampshire and trace or light amounts farther south. Resolution relies on verified observations from sources like The Weather Company or NWS CLI reports rather than forecasts, with no further model updates expected. Historical September baselines show variable daily rainfall, underscoring the role of exact station thresholds in outcome determination.