At 137 PM CDT, Doppler radar and automated rain gauges indicated thunderstorms producing heavy rain moving back into the area from the west, especially near the Minnesota-Iowa state line from Ellsworth to Bigelow. Between 2 and 3.5 inches of rain have fallen across the warned area. The expected rainfall rate is 1 to 3 inches in 1 hour. Additional rainfall amounts of 1.5 to 3 inches are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD...Flash flooding caused by thunderstorms. SOURCE...Radar and automated gauges. IMPACT...Flash flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other poor drainage and low-lying areas. Some locations that will experience flash flooding include... Worthington, Ellsworth, Little Rock, Rushmore and Bigelow.

* WHAT...Flash flooding caused by excessive rainfall is possible. * WHERE...Portions of Iowa, including the following areas, Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon, O'Brien, Osceola, Plymouth, Sioux and Woodbury, southwest Minnesota, including the following areas, Cottonwood, Jackson, Murray, Nobles, Pipestone and Rock, and southeast South Dakota, including the following areas, Lincoln, Minnehaha and Union. * WHEN...Until 10 PM CDT this evening. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. * ADDITIONAL DETAILS... - Slow moving thunderstorms may lead to rapid rainfall accumulations. Hourly rainfall rates of 2 to 4 inches are possible. This rainfall may lead to flash flooding along with rapid rises on streams and creeks. - Stay up to date with the latest river observations and forecasts at: water.noaa.gov