The SPC (Storm Prediction Center) Excessive Rainfall Outlook (ERO) is a probabilistic forecast product that indicates the likelihood of rainfall exceeding flash flood guidance within a 25-mile radius of a point. It uses categories like Marginal, Slight, Moderate, and High to convey the risk of excessive rainfall and potential flash flooding. These categories correspond to varying probabilities of exceeding flash flood guidance, with higher categories indicating a greater risk.
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