Severe · Flash Flood WarningActive alert
Flash Flood Warning issued October 1 at 4:38AM CDT until October 1
Affecting Black Hawk, IA; Butler, IA; Grundy, IA; Tama, IA
In effect until: Oct 1, 2026, 3:45 PM
Black Hawk, IA; Butler, IA; Grundy, IA; Tama, IA
Likely impact across 4 counties in IA; effects through 3:45 PM.
Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be aware of your surroundings and do not drive on flooded roads. For the latest stream observations and forecasts refer to weather.gov/desmoines/water.
Read the original bulletin (official text)
FFWDMX The National Weather Service in Des Moines has issued a * Flash Flood Warning for... Grundy County in central Iowa... Northern Tama County in central Iowa... Southeastern Butler County in north central Iowa... Black Hawk County in northeastern Iowa... * Until 1045 AM CDT Thursday. * At 438 AM CDT, Doppler radar and automated rain gauges indicated thunderstorms producing heavy rain across the warned area. Between 1 and 3 inches of rain have fallen. The expected rainfall rate is 1 to 2 inches in 1 hour. Additional rainfall amounts of 1 to 2 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... Waterloo, Cedar Falls, Grundy Center, Evansdale, Hudson, Reinbeck, Dike, Elk Run Heights, Uni-Dome And McLeod Center, Waterloo Municipal Airport, Crossroads Mall, Washburn, Dunkerton, Raymond, Wellsburg, New Hartford, Holland, Stout and Morrison. This includes Interstate 380 between mile markers 65 and 73.
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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™