Current National Weather Service and NOAA outlooks indicate a moderate risk of excessive rainfall focused on Indiana and Ohio on August 20, driven by frontal boundaries and instability favoring showers and thunderstorms. Broader model guidance from the Weather Prediction Center shows light precipitation possible across parts of the Midwest and East, with totals often under 0.25 inches where measurable rain develops. The Southwest monsoon remains active, supporting scattered storms in the Four Corners region, while Pacific Northwest and much of the South stay drier per seasonal patterns. Traders monitor real-time NWS updates, radar trends, and station reports (e.g., Weather Underground thresholds of 0.01 inch) for resolution, as short-term convective evolution can shift localized outcomes before markets close.