Report: Rainfall analysis for the 2-day period ending August 13, 2016, at 7:00AM CDT

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US National Weather Service Lower Mississippi River Forecast Center / Facebook

US National Weather Service Lower Mississippi River Forecast Center

Quality controlled-rainfall analysis for the 2-day period ending August 13th, 2016, at 7:00AM CDT. This time period corresponds to roughly the period of heaviest rainfall over portions of southern Louisiana.

This rainfall analysis was created using a combination of gauge observations, radar-derived estimates, and forecaster judgment. Widespread totals of 10.0 inches or greater were observed across the area, and some smaller areas experienced greater than 15.0 inches. Just northeast of Baton Rouge, rainfall of about 25.0 inches was observed over this 2-day period in an isolated area.

The observed rainfall totals were quite significant and rare. The chance in any given year of experiencing a 2-day rainfall of this magnitude (the Annual Exceedance Probability) range from about 10% (areas experiencing 10 inches) to as small as 0.1% (areas experiencing more than 20 inches).