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Central US: Major river flooding to continue after catastrophic, deadly flash flooding

River flooding on the major rivers could lead to weeks of inundation, great economic loss after relentless rainfall led to catastrophic flooding.

By Alex Sosnowski, AccuWeather senior meteorologist

Published Apr 4, 2025 12:19 PM EDT | Updated Apr 7, 2025 4:03 AM EDT

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A home was seen floating down the Kentucky River in Frankfort, Kentucky, on April 5 as heavy rain caused widespread flash flooding in the Bluegrass State.

Torrential rainfall through Sunday night triggered widespread, life-threatening and catastrophic flash flooding centered on the mid-Mississippi and Ohio valleys. In the next few weeks, runoff from the extreme rainfall will result in moderate to major flooding on the secondary and largest rivers in the region.

Numerous locations in Tennessee and Kentucky have reported double-digit rainfall totals from this historic event.

The rainfall has already caused scores of flash flood warnings and even flash flood emergencies, with runoff inundating some neighborhoods. Many small streams have overflowed banks or soon will at a rapid pace.

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Similar to what happened with Helene in the southern Appalachians, roads and bridges along small streams may be washed away, and small streams can become raging torrents of high water that put lives in peril and wash away homes and vehicles.

In some cases, the rate of rain has overwhelmed, and will continue to overwhelm, storm drainage capabilities. When done, this could end up being a once-in-a-500- to 1,000-year rain event.

Because of the scope of rainfall, AccuWeather meteorologists issued a rare catastrophic flood impact and a massive zone of extreme flood impact from Arkansas to western Kentucky and far southern Indiana. Such a situation has not unfolded since Helene.

A broad area of 8-16 inches of rain has fallen. The final amount of rain projected is equivalent to two to four month's worth of rain in the region.

Rain has not fallen evenly across the region, due in part to the orientation of the atmospheric river, or the plume of moisture-rich air originating from the Caribbean and Gulf. However, a more progressive and widespread round of intense rain occurred Saturday to Saturday night. This happened as the caboose in the train of moisture-rich storms moves along.

From late Saturday to Saturday night, multiple hours of extreme rain and deadly flash flooding followed the terror of severe thunderstorms with tornadoes from the mid-Mississippi Valley to portions of the Ohio and Tennessee valleys.

Even long after the rain, all the water that gathered in urban areas and small streams will continue to flow and surge into progressively larger rivers in the region.

Flooding on the secondary rivers will be followed by flooding along the largest rivers in the region--the Ohio and lower Mississippi. Moderate to major flooding is forecast along these massive waterways. Some major roads and highways could be underwater for an extended period.

Because water takes many days and weeks to reach a crest then drop below flood stage, some unprotected areas along the Ohio and Mississippi could be underwater for a long period of time. This means that, in some cases, farmland could be inundated or too muddy to access well into the growing season.

The northern cutoff for the high water on the Mississippi is just below St. Louis, as the heaviest rain has stayed to the south of the major port on the river. However, heavy rain has fallen on the Merrimec River basin just south of St. Louis and is leading to significant flooding.

It may take two to three weeks for the surge of water to cycle to the Mississippi Delta region, including the Atchafalaya flood control zone and later New Orleans. The high and fast-moving water will negatively affect tug and barge operations on the Ohio and lower Mississippi rivers. Due to high water, the tugs will not be able to pull as many barges or may not be able to reach some ports.

As the caboose storm picks up forward speed, it will spread much-needed rain to drought and wildfire-ravaged areas of the southern Appalachians and the Carolinas.

While the rate of rain can be heavy in these areas with highly localized flash and urban flooding, the widespread problems over the mid-Mississippi basin should not be repeated.

However, there will be severe weather possible through Monday in the Southeast states. The severe weather risk includes the potential for a few tornadoes.

More stories of interest:

Weather Explained: What is a Flash Flood?
What everyone should know about these 3 most common types of flooding
LIVE: Flooding turns deadly in Kentucky as child is swept away by high water
Winter conditions return to Northeast, heat builds in Southwest

Want next-level safety, ad-free? Unlock advanced, hyperlocal severe weather alerts when you subscribe to Premium+ on the AccuWeather app. AccuWeather Alerts™ are prompted by our expert meteorologists who monitor and analyze dangerous weather risks 24/7 to keep you and your family safer.

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AccuWeather Weather Forecasts Central US: Major river flooding to continue after catastrophic, deadly flash flooding
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