National Weather Service Issues Flash Flood Warning For Will And Kendall Counties

The National Weather Service issued an urgent flash flood warning covering northern Will County and Kendall County in Illinois on Saturday morning, August 1, 2026. Severe thunderstorms generating torrential rainfall moved rapidly across the region, dropping between 2 and 3 inches of rain locally in a short operational window. Meteorological tracking indicated that additional rainfall amounts up to 1 inch remained possible as the convective system progressed. The warning encompassed numerous municipalities, including Joliet, Naperville, Bolingbrook, Romeoville, Plainfield, Oswego, Lockport, Yorkville, Minooka, Crest Hill, Montgomery, Shorewood, Boulder Hill, Fairmont, Rockdale, and Crystal Lawns. Emergency management authorities warned residents to prepare for rapid-onset flooding affecting small creeks, streams, drainage ditches, street networks, and underpasses. Local transportation routes experienced water accumulation, prompting police departments to urge motorists to avoid flooded lanes and adhere to turnaround safety advisories. Municipal emergency crews remained on standby as weather radar tracked continued storm movement across northern Illinois.