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Midwest Flash Flood Threat Spans Sioux Falls to Chicago

By Drooid · Sep 18, 2026, 6:28 PM UTC · How we work

Summary

Midwest Faces Floods

ABC News reports a level-2 flash flood threat across the Midwest on Friday.
The threat stretches from South Dakota to Illinois, hitting Minneapolis, Milwaukee and Madison.
Heavy rain Saturday could flood Chicago roads and disrupt commuter traffic.
Sunday brings a level-1 flash flood threat along I-95, affecting New York City, Boston and Washington, D.C.
A stalled frontal boundary and persistent heat dome drive the multi-day flooding.

Summary

Low-Level Jet Fuels Storms

A low-level jet will transport moisture, fueling repeated thunderstorms over northern and eastern Iowa.
Precipitable water values near 2 inches, near the upper historical September range, will enable efficient rainfall.
The National Weather Service issued a marginal severe storm risk with possible 60-70 mph wind gusts.
Flood watches cover northeastern and east-central Iowa because saturated soils limit new rain absorption.

History

Historical Context

In April 1993, saturated soils and relentless summer rains caused the Great Mississippi and Missouri River Flood, inundating nine states, killing 50 people and costing $12–16 billion. The disaster spurred federal agencies—including the U.S. Army Corps of Engineers, FEMA and the National Weather Service—to tighten floodplain rules and expand levee systems. Today’s stalled frontal boundary mirrors that 1993 pattern, prompting similar multi-state evacuations.

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Midwest Faces Floods

ABC News reports a level-2 flash flood threat across the Midwest on Friday.
The threat stretches from South Dakota to Illinois, hitting Minneapolis, Milwaukee and Madison.
Heavy rain Saturday could flood Chicago roads and disrupt commuter traffic.
Sunday brings a level-1 flash flood threat along I-95, affecting New York City, Boston and Washington, D.C.
A stalled frontal boundary and persistent heat dome drive the multi-day flooding.

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