Summary (tl;dr)

Flash Flood Watches and Warnings are in effect across parts of the Midwestern and Southeastern United States due to recent severe thunderstorms and heavy rainfall, disrupting holiday plans and causing widespread flooding.

Essential Background

The month of July 2026 was predicted to bring significant extreme weather events across the United States, including dangerous heatwaves, severe thunderstorms, and a heightened risk of flooding. This forecast is consistent with broader climate change trends, which are contributing to more intense rainfall events due to warmer oceans and a more moisture-laden atmosphere. Historically, flash flooding has been identified as the deadliest hazard associated with severe thunderstorms and is notoriously difficult to predict accurately.

The Full Story

Currently, numerous Flash Flood Watches and Warnings have been issued for several areas, particularly in Illinois, Northwest Indiana, parts of Iowa, and metro Atlanta, Georgia. Heavy rainfall from slow-moving thunderstorms has led to significant flooding, resulting in road closures and disruptions, especially during the July 4th holiday weekend. For instance, in Illinois, areas like Kane, Cook, DuPage, and Will counties, along with Lake County in Indiana, are under active flood warnings, with major flooding reported in northwest suburbs such as Bartlett and Huntley. Similarly, metro Atlanta counties, including DeKalb and Gwinnett, are experiencing flash flooding due to torrential rains. Des Moines, Iowa, is also facing flooding, particularly near Fourmile Creek, leading to road and trail closures. Airports like Chicago's O'Hare have experienced delays due to the severe weather.

Why It Matters

The ongoing flood watches and warnings are critical because flash flooding poses a significant danger to life and property, often leading to fatalities when individuals attempt to drive through flooded roads. The intense rainfall can overwhelm urban drainage systems and lead to rapid water accumulation, impacting homes, businesses, and infrastructure. These events highlight the vulnerability of communities to extreme weather, especially given the increased frequency and intensity of such events attributed to climate change. The disruptions to travel and holiday festivities also underscore the immediate economic and social impact of severe weather.

Geographic Location

• DeKalb County, Georgia, United States (flash flood warning)
• Gwinnett County, Georgia, United States (flash flood warning)
• Des Moines, Polk County, Iowa, United States (flooding near Fourmile Creek, road and trail closures)
• Ames, Story County, Iowa, United States (minor flooding of South Skunk River)
• De Kalb County, Illinois, United States (flash flood watch)
• DuPage County, Illinois, United States (flash flood watch and warning, major flooding in Bartlett)
• Eastern Will County, Illinois, United States (flash flood watch)
• Grundy County, Illinois, United States (flash flood watch)
• Kane County, Illinois, United States (flash flood watch and warning)
• Kendall County, Illinois, United States (flash flood watch)
• La Salle County, Illinois, United States (flash flood watch)
• Northern Cook County, Illinois, United States (flash flood watch)
• Northern Will County, Illinois, United States (flash flood watch)
• Southern Cook County, Illinois, United States (flash flood watch and warning)
• Southern Will County, Illinois, United States (flash flood watch and warning, warning for Bolingbrook)
• Bartlett, DuPage County, Illinois, United States (major flooding, stalled vehicles, house flooding)
• Huntley, McHenry County, Illinois, United States (road closures due to flooding)
• Elgin, Kane County, Illinois, United States (severe flooding, cars floating, fireworks cancelled)
• Streamwood, Cook County, Illinois, United States (severe flooding)
• Hanover Park, Cook County, Illinois, United States (severe flooding)
• Schaumburg, Cook County, Illinois, United States (severe flooding)
• Lake County, Indiana, United States (flash flood watch and warning)